./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2041147715

<...>
Warning: Permanently added '10.128.1.147' (ED25519) to the list of known hosts.
execve("./syz-executor2041147715", ["./syz-executor2041147715"], 0x7ffeb3bab670 /* 10 vars */) = 0
brk(NULL)                               = 0x55558cd07000
brk(0x55558cd07d00)                     = 0x55558cd07d00
arch_prctl(ARCH_SET_FS, 0x55558cd07380) = 0
set_tid_address(0x55558cd07650)         = 5837
set_robust_list(0x55558cd07660, 24)     = 0
rseq(0x55558cd07ca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor2041147715", 4096) = 28
getrandom("\x25\x60\x8b\x37\x86\xae\xf5\x2a", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55558cd07d00
brk(0x55558cd28d00)                     = 0x55558cd28d00
brk(0x55558cd29000)                     = 0x55558cd29000
mprotect(0x7fbbcd086000, 16384, PROT_READ) = 0
mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000
mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000
mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = 3
ioctl(3, LOOP_CLR_FD)                   = -1 ENXIO (No such device or address)
close(3)                                = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5839 attached
 <unfinished ...>
[pid  5839] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5839
[pid  5839] <... set_robust_list resumed>) = 0
[pid  5839] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5839] setpgid(0, 0)               = 0
[pid  5839] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5839] write(3, "1000", 4)         = 4
[pid  5839] close(3)                    = 0
[pid  5839] write(1, "executing program\n", 18executing program
) = 18
[pid  5839] memfd_create("syzkaller", 0) = 3
[pid  5839] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5839] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5839] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5839] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid  5839] ioctl(4, LOOP_SET_FD, 3)    = 0
[pid  5839] close(3)                    = 0
[pid  5839] close(4)                    = 0
[pid  5839] mkdir("./file1", 0777)      = 0
syzkaller login: [   79.033013][ T5839] loop0: detected capacity change from 0 to 32768
[   79.058802][ T5839] =======================================================
[   79.058802][ T5839] WARNING: The mand mount option has been deprecated and
[   79.058802][ T5839]          and is ignored by this kernel. Remove the mand
[   79.058802][ T5839]          option from the mount to silence this warning.
[   79.058802][ T5839] =======================================================
[   79.120130][ T5839] JBD2: Ignoring recovery information on journal
[pid  5839] mount("/dev/loop0", "./file1", "ocfs2", MS_MANDLOCK|MS_DIRSYNC|MS_NODIRATIME, "acl,heartbeat=none,inode64,localalloc=00000000000000001714,acl,localflocks,coherency=full,noacl,") = 0
[pid  5839] openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3
[pid  5839] chdir("./file1")            = 0
[pid  5839] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5839] mkdirat(AT_FDCWD, "./file0", 000) = 0
[   79.150711][ T5839] ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
[pid  5839] mkdirat(AT_FDCWD, "./bus", 000) = 0
[   79.219440][ T5839] overlayfs: upper fs does not support tmpfile.
[   79.227804][ T5839] overlayfs: upper fs does not support RENAME_WHITEOUT.
[   79.235393][ T5839] 
[   79.237717][ T5839] ======================================================
[   79.245235][ T5839] WARNING: possible circular locking dependency detected
[   79.252256][ T5839] 6.16.0-rc7-syzkaller-00105-g2942242dde89 #0 Not tainted
[   79.259344][ T5839] ------------------------------------------------------
[   79.266347][ T5839] syz-executor204/5839 is trying to acquire lock:
[   79.272739][ T5839] ffff88807fc6c2c0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: ocfs2_reserve_local_alloc_bits+0x125/0x24e0
[   79.286243][ T5839] 
[   79.286243][ T5839] but task is already holding lock:
[   79.293587][ T5839] ffff88807fc6eab8 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x40f/0x11f0
[   79.303053][ T5839] 
[   79.303053][ T5839] which lock already depends on the new lock.
[   79.303053][ T5839] 
[   79.313434][ T5839] 
[   79.313434][ T5839] the existing dependency chain (in reverse order) is:
[   79.322426][ T5839] 
[   79.322426][ T5839] -> #4 (&oi->ip_xattr_sem){+.+.}-{4:4}:
[   79.330228][ T5839]        lock_acquire+0x120/0x360
[   79.335250][ T5839]        down_write+0x96/0x1f0
[   79.340022][ T5839]        ocfs2_xattr_set_handle+0x3b0/0x7a0
[   79.345911][ T5839]        ocfs2_init_security_set+0xbd/0xe0
[   79.351717][ T5839]        ocfs2_mknod+0x137f/0x2050
[   79.356820][ T5839]        ocfs2_mkdir+0x191/0x440
[   79.361749][ T5839]        vfs_mkdir+0x306/0x510
[   79.366511][ T5839]        do_mkdirat+0x247/0x590
[   79.371377][ T5839]        __x64_sys_mkdirat+0x87/0xa0
[   79.376674][ T5839]        do_syscall_64+0xfa/0x3b0
[   79.381804][ T5839]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.388221][ T5839] 
[   79.388221][ T5839] -> #3 (jbd2_handle){.+.+}-{0:0}:
[   79.395521][ T5839]        lock_acquire+0x120/0x360
[   79.400539][ T5839]        start_this_handle+0x1fa7/0x21c0
[   79.406170][ T5839]        jbd2__journal_start+0x2c1/0x5b0
[   79.411798][ T5839]        jbd2_journal_start+0x2a/0x40
[   79.417166][ T5839]        ocfs2_start_trans+0x376/0x6d0
[   79.422621][ T5839]        ocfs2_reserve_suballoc_bits+0x711/0x4640
[   79.429031][ T5839]        ocfs2_reserve_new_metadata_blocks+0x403/0x940
[   79.435873][ T5839]        ocfs2_mknod+0xe08/0x2050
[   79.440887][ T5839]        ocfs2_mkdir+0x191/0x440
[   79.445814][ T5839]        vfs_mkdir+0x306/0x510
[   79.450573][ T5839]        do_mkdirat+0x247/0x590
[   79.455420][ T5839]        __x64_sys_mkdirat+0x87/0xa0
[   79.460700][ T5839]        do_syscall_64+0xfa/0x3b0
[   79.465718][ T5839]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.472210][ T5839] 
[   79.472210][ T5839] -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
[   79.480719][ T5839]        lock_acquire+0x120/0x360
[   79.485755][ T5839]        down_read+0x46/0x2e0
[   79.490425][ T5839]        ocfs2_start_trans+0x36a/0x6d0
[   79.495883][ T5839]        ocfs2_reserve_suballoc_bits+0x711/0x4640
[   79.502293][ T5839]        ocfs2_reserve_new_metadata_blocks+0x403/0x940
[   79.509138][ T5839]        ocfs2_mknod+0xe08/0x2050
[   79.514154][ T5839]        ocfs2_mkdir+0x191/0x440
[   79.519082][ T5839]        vfs_mkdir+0x306/0x510
[   79.523845][ T5839]        do_mkdirat+0x247/0x590
[   79.528691][ T5839]        __x64_sys_mkdirat+0x87/0xa0
[   79.533974][ T5839]        do_syscall_64+0xfa/0x3b0
[   79.538990][ T5839]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.545394][ T5839] 
[   79.545394][ T5839] -> #1 (sb_internal#2){.+.+}-{0:0}:
[   79.552870][ T5839]        lock_acquire+0x120/0x360
[   79.558839][ T5839]        ocfs2_start_trans+0x26b/0x6d0
[   79.564311][ T5839]        ocfs2_mknod+0xe93/0x2050
[   79.569326][ T5839]        ocfs2_mkdir+0x191/0x440
[   79.574252][ T5839]        vfs_mkdir+0x306/0x510
[   79.579016][ T5839]        do_mkdirat+0x247/0x590
[   79.583861][ T5839]        __x64_sys_mkdirat+0x87/0xa0
[   79.589141][ T5839]        do_syscall_64+0xfa/0x3b0
[   79.594157][ T5839]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.600559][ T5839] 
[   79.600559][ T5839] -> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}:
[   79.611074][ T5839]        validate_chain+0xb9b/0x2140
[   79.616352][ T5839]        __lock_acquire+0xab9/0xd20
[   79.621627][ T5839]        lock_acquire+0x120/0x360
[   79.626638][ T5839]        down_write+0x96/0x1f0
[   79.631395][ T5839]        ocfs2_reserve_local_alloc_bits+0x125/0x24e0
[   79.638058][ T5839]        ocfs2_reserve_clusters_with_limit+0x1be/0xba0
[   79.644913][ T5839]        ocfs2_init_xattr_set_ctxt+0x376/0x700
[   79.651064][ T5839]        ocfs2_xattr_set+0xb70/0x11f0
[   79.656431][ T5839]        __vfs_setxattr+0x43c/0x480
[   79.661619][ T5839]        __vfs_setxattr_noperm+0x12d/0x660
[   79.667416][ T5839]        vfs_setxattr+0x16b/0x2f0
[   79.672431][ T5839]        ovl_get_workdir+0xbb7/0x1730
[   79.677796][ T5839]        ovl_fill_super+0x1386/0x35d0
[   79.683159][ T5839]        get_tree_nodev+0xb8/0x150
[   79.688286][ T5839]        vfs_get_tree+0x92/0x2b0
[   79.693230][ T5839]        do_new_mount+0x24a/0xa40
[   79.698320][ T5839]        __se_sys_mount+0x317/0x410
[   79.703553][ T5839]        do_syscall_64+0xfa/0x3b0
[   79.708589][ T5839]        entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.715000][ T5839] 
[   79.715000][ T5839] other info that might help us debug this:
[   79.715000][ T5839] 
[   79.725216][ T5839] Chain exists of:
[   79.725216][ T5839]   &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5 --> jbd2_handle --> &oi->ip_xattr_sem
[   79.725216][ T5839] 
[   79.740973][ T5839]  Possible unsafe locking scenario:
[   79.740973][ T5839] 
[   79.748436][ T5839]        CPU0                    CPU1
[   79.753888][ T5839]        ----                    ----
[   79.759243][ T5839]   lock(&oi->ip_xattr_sem);
[   79.763832][ T5839]                                lock(jbd2_handle);
[   79.770424][ T5839]                                lock(&oi->ip_xattr_sem);
[   79.777536][ T5839]   lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5);
[   79.784827][ T5839] 
[   79.784827][ T5839]  *** DEADLOCK ***
[   79.784827][ T5839] 
[   79.792961][ T5839] 4 locks held by syz-executor204/5839:
[   79.798505][ T5839]  #0: ffff888030e080e0 (&type->s_umount_key#43/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970
[   79.808635][ T5839]  #1: ffff888030fca428 (sb_writers#8){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
[   79.817795][ T5839]  #2: ffff88807fc6ed80 (&sb->s_type->i_mutex_key#16){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0
[   79.828254][ T5839]  #3: ffff88807fc6eab8 (&oi->ip_xattr_sem){+.+.}-{4:4}, at: ocfs2_xattr_set+0x40f/0x11f0
[   79.838181][ T5839] 
[   79.838181][ T5839] stack backtrace:
[   79.844082][ T5839] CPU: 0 UID: 0 PID: 5839 Comm: syz-executor204 Not tainted 6.16.0-rc7-syzkaller-00105-g2942242dde89 #0 PREEMPT(full) 
[   79.844103][ T5839] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
[   79.844119][ T5839] Call Trace:
[   79.844130][ T5839]  <TASK>
[   79.844138][ T5839]  dump_stack_lvl+0x189/0x250
[   79.844161][ T5839]  ? __pfx_dump_stack_lvl+0x10/0x10
[   79.844178][ T5839]  ? __pfx__printk+0x10/0x10
[   79.844198][ T5839]  ? print_lock_name+0xde/0x100
[   79.844218][ T5839]  print_circular_bug+0x2ee/0x310
[   79.844238][ T5839]  check_noncircular+0x134/0x160
[   79.844263][ T5839]  validate_chain+0xb9b/0x2140
[   79.844282][ T5839]  ? __mutex_unlock_slowpath+0x1cd/0x700
[   79.844302][ T5839]  ? __pfx___mutex_unlock_slowpath+0x10/0x10
[   79.844322][ T5839]  __lock_acquire+0xab9/0xd20
[   79.844339][ T5839]  ? ocfs2_reserve_local_alloc_bits+0x125/0x24e0
[   79.844356][ T5839]  lock_acquire+0x120/0x360
[   79.844369][ T5839]  ? ocfs2_reserve_local_alloc_bits+0x125/0x24e0
[   79.844387][ T5839]  ? is_bpf_text_address+0x26/0x2b0
[   79.844404][ T5839]  ? kernel_text_address+0xa5/0xe0
[   79.844428][ T5839]  down_write+0x96/0x1f0
[   79.844446][ T5839]  ? ocfs2_reserve_local_alloc_bits+0x125/0x24e0
[   79.844462][ T5839]  ? __pfx_down_write+0x10/0x10
[   79.844485][ T5839]  ocfs2_reserve_local_alloc_bits+0x125/0x24e0
[   79.844506][ T5839]  ? check_noncircular+0xe0/0x160
[   79.844525][ T5839]  ? lockdep_unlock+0x89/0x120
[   79.844546][ T5839]  ? validate_chain+0x897/0x2140
[   79.844564][ T5839]  ? __pfx_ocfs2_reserve_local_alloc_bits+0x10/0x10
[   79.844580][ T5839]  ? get_tree_nodev+0xb8/0x150
[   79.844609][ T5839]  ? __lock_acquire+0xab9/0xd20
[   79.844629][ T5839]  ? do_raw_spin_unlock+0x122/0x240
[   79.844650][ T5839]  ? _raw_spin_unlock+0x28/0x50
[   79.844673][ T5839]  ? ocfs2_alloc_should_use_local+0x152/0x310
[   79.844688][ T5839]  ? ocfs2_reserve_clusters_with_limit+0x16b/0xba0
[   79.844709][ T5839]  ocfs2_reserve_clusters_with_limit+0x1be/0xba0
[   79.844732][ T5839]  ? __pfx_ocfs2_reserve_clusters_with_limit+0x10/0x10
[   79.844756][ T5839]  ? __pfx_ocfs2_calc_xattr_set_need+0x10/0x10
[   79.844774][ T5839]  ? __lock_acquire+0xab9/0xd20
[   79.844791][ T5839]  ocfs2_init_xattr_set_ctxt+0x376/0x700
[   79.844816][ T5839]  ? __pfx_ocfs2_init_xattr_set_ctxt+0x10/0x10
[   79.844840][ T5839]  ? ocfs2_xattr_set+0xb36/0x11f0
[   79.844866][ T5839]  ? up_write+0x1c4/0x420
[   79.844883][ T5839]  ? ocfs2_xattr_set+0x334/0x11f0
[   79.844905][ T5839]  ocfs2_xattr_set+0xb70/0x11f0
[   79.844934][ T5839]  ? __pfx_ocfs2_xattr_set+0x10/0x10
[   79.844955][ T5839]  ? up+0xde/0x150
[   79.844973][ T5839]  ? smack_log+0xef/0x3f0
[   79.844996][ T5839]  ? __pfx___console_unlock+0x10/0x10
[   79.845015][ T5839]  ? smk_access+0x14c/0x4e0
[   79.845037][ T5839]  ? smk_tskacc+0x2fc/0x370
[   79.845060][ T5839]  ? posix_xattr_acl+0x93/0xc0
[   79.845080][ T5839]  ? evm_protect_xattr+0x4d4/0xa90
[   79.845100][ T5839]  ? __pfx_evm_protect_xattr+0x10/0x10
[   79.845118][ T5839]  ? safesetid_security_capable+0xa9/0x1a0
[   79.845135][ T5839]  ? __pfx_ocfs2_xattr_trusted_set+0x10/0x10
[   79.845158][ T5839]  __vfs_setxattr+0x43c/0x480
[   79.845178][ T5839]  __vfs_setxattr_noperm+0x12d/0x660
[   79.845197][ T5839]  vfs_setxattr+0x16b/0x2f0
[   79.845216][ T5839]  ? __pfx_vfs_setxattr+0x10/0x10
[   79.845233][ T5839]  ? up_write+0x1c4/0x420
[   79.845252][ T5839]  ovl_get_workdir+0xbb7/0x1730
[   79.845280][ T5839]  ? __pfx_ovl_get_workdir+0x10/0x10
[   79.845309][ T5839]  ? do_raw_spin_unlock+0x122/0x240
[   79.845330][ T5839]  ? _raw_spin_unlock+0x28/0x50
[   79.845352][ T5839]  ? ovl_inuse_trylock+0xae/0xf0
[   79.845372][ T5839]  ovl_fill_super+0x1386/0x35d0
[   79.845395][ T5839]  ? rcu_is_watching+0x15/0xb0
[   79.845415][ T5839]  ? shrinker_register+0x124/0x230
[   79.845437][ T5839]  ? __pfx_ovl_fill_super+0x10/0x10
[   79.845456][ T5839]  ? __pfx___mutex_lock+0x10/0x10
[   79.845473][ T5839]  ? __pfx___mutex_unlock_slowpath+0x10/0x10
[   79.845493][ T5839]  ? __raw_spin_lock_init+0x45/0x100
[   79.845518][ T5839]  ? sget_fc+0x962/0xa40
[   79.845539][ T5839]  ? __pfx_set_anon_super_fc+0x10/0x10
[   79.845561][ T5839]  ? __pfx_ovl_fill_super+0x10/0x10
[   79.845581][ T5839]  get_tree_nodev+0xb8/0x150
[   79.845604][ T5839]  vfs_get_tree+0x92/0x2b0
[   79.845620][ T5839]  do_new_mount+0x24a/0xa40
[   79.845639][ T5839]  __se_sys_mount+0x317/0x410
[   79.845658][ T5839]  ? __pfx___se_sys_mount+0x10/0x10
[   79.845675][ T5839]  ? rcu_is_watching+0x15/0xb0
[   79.845693][ T5839]  ? __x64_sys_mount+0x20/0xc0
[   79.845710][ T5839]  do_syscall_64+0xfa/0x3b0
[   79.845727][ T5839]  ? lockdep_hardirqs_on+0x9c/0x150
[   79.845742][ T5839]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.845757][ T5839]  ? clear_bhb_loop+0x60/0xb0
[   79.845775][ T5839]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.845790][ T5839] RIP: 0033:0x7fbbcd00dfd9
[   79.845809][ T5839] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[   79.845823][ T5839] RSP: 002b:00007ffef56ac988 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[   79.845840][ T5839] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fbbcd00dfd9
[   79.845852][ T5839] RDX: 0000200000000b80 RSI: 0000200000000c00 RDI: 0000000000000000
[   79.845863][ T5839] RBP: 00007fbbcd0865f0 R08: 0000200000000240 R09: 000055558cd084c0
[   79.845874][ T5839] R10: 0000000000200008 R11: 0000000000000246 R12: 00007ffef56ac9b0
[   79.845885][ T5839] R13: 00007ffef56acbd8 R14: 431bde82d7b634db R15: 00007fbbcd05703b
[   79.845902][ T5839]  </TASK>
[pid  5839] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5839] exit_group(0)               = ?
[pid  5839] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5839, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=21 /* 0.21 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
[   80.372590][ T5839] overlayfs: upper fs missing required features.
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55558cd07650) = 5843
./strace-static-x86_64: Process 5843 attached
[pid  5843] set_robust_list(0x55558cd07660, 24) = 0
[pid  5843] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5843] setpgid(0, 0)               = 0
[pid  5843] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5843] write(3, "1000", 4)         = 4
[pid  5843] close(3)                    = 0
executing program
[pid  5843] write(1, "executing program\n", 18) = 18
[pid  5843] memfd_create("syzkaller", 0) = 3
[pid  5843] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5843] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5843] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5843] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5843] close(3)                    = 0
[pid  5843] mkdirat(AT_FDCWD, "./file0", 000) = 0
[pid  5843] mkdirat(AT_FDCWD, "./bus", 000) = 0
[pid  5843] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = 0
[pid  5843] exit_group(0)               = ?
[pid  5843] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5843, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5844 attached
, child_tidptr=0x55558cd07650) = 5844
[pid  5844] set_robust_list(0x55558cd07660, 24) = 0
[pid  5844] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5844] setpgid(0, 0)               = 0
[pid  5844] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5844] write(3, "1000", 4)         = 4
[pid  5844] close(3)                    = 0
executing program
[pid  5844] write(1, "executing program\n", 18) = 18
[pid  5844] memfd_create("syzkaller", 0) = 3
[pid  5844] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5844] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5844] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5844] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5844] close(3)                    = 0
[pid  5844] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5844] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5844] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5844] exit_group(0)               = ?
[pid  5844] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5844, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=10 /* 0.10 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5845 attached
 <unfinished ...>
[pid  5845] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5845
[pid  5845] <... set_robust_list resumed>) = 0
[pid  5845] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5845] setpgid(0, 0)               = 0
[pid  5845] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5845] write(3, "1000", 4)         = 4
[   80.870915][ T5844] overlay: filesystem on ./bus not supported as upperdir
[pid  5845] close(3)                    = 0
[pid  5845] write(1, "executing program\n", 18executing program
) = 18
[pid  5845] memfd_create("syzkaller", 0) = 3
[pid  5845] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5845] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5845] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5845] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5845] close(3)                    = 0
[pid  5845] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5845] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5845] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5845] exit_group(0)               = ?
[pid  5845] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5845, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5846 attached
 <unfinished ...>
[pid  5846] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5846
[pid  5846] <... set_robust_list resumed>) = 0
[pid  5846] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5846] setpgid(0, 0)               = 0
[   81.114826][ T5845] overlay: filesystem on ./bus not supported as upperdir
[pid  5846] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5846] write(3, "1000", 4)         = 4
[pid  5846] close(3)                    = 0
executing program
[pid  5846] write(1, "executing program\n", 18) = 18
[pid  5846] memfd_create("syzkaller", 0) = 3
[pid  5846] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5846] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5846] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5846] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5846] close(3)                    = 0
[pid  5846] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5846] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5846] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5846] exit_group(0)               = ?
[pid  5846] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5846, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=11 /* 0.11 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5847 attached
 <unfinished ...>
[pid  5847] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5847
[pid  5847] <... set_robust_list resumed>) = 0
[pid  5847] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5847] setpgid(0, 0)               = 0
[pid  5847] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5847] write(3, "1000", 4)         = 4
[pid  5847] close(3)                    = 0
executing program
[pid  5847] write(1, "executing program\n", 18) = 18
[pid  5847] memfd_create("syzkaller", 0) = 3
[pid  5847] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[   81.359000][ T5846] overlay: filesystem on ./bus not supported as upperdir
[pid  5847] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5847] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5847] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5847] close(3)                    = 0
[pid  5847] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5847] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5847] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5847] exit_group(0)               = ?
[pid  5847] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5847, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=11 /* 0.11 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5849 attached
 <unfinished ...>
[pid  5849] set_robust_list(0x55558cd07660, 24) = 0
[pid  5849] prctl(PR_SET_PDEATHSIG, SIGKILL <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5849
[pid  5849] <... prctl resumed>)        = 0
[pid  5849] setpgid(0, 0)               = 0
[pid  5849] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5849] write(3, "1000", 4)         = 4
[pid  5849] close(3)                    = 0
[pid  5849] write(1, "executing program\n", 18executing program
) = 18
[pid  5849] memfd_create("syzkaller", 0) = 3
[pid  5849] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[   81.601344][ T5847] overlay: filesystem on ./bus not supported as upperdir
[pid  5849] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5849] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5849] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5849] close(3)                    = 0
[pid  5849] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5849] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5849] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5849] exit_group(0)               = ?
[pid  5849] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5849, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5850 attached
, child_tidptr=0x55558cd07650) = 5850
[pid  5850] set_robust_list(0x55558cd07660, 24) = 0
[   81.809107][ T5849] overlay: filesystem on ./bus not supported as upperdir
[pid  5850] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5850] setpgid(0, 0)               = 0
[pid  5850] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5850] write(3, "1000", 4)         = 4
[pid  5850] close(3)                    = 0
[pid  5850] write(1, "executing program\n", 18executing program
) = 18
[pid  5850] memfd_create("syzkaller", 0) = 3
[pid  5850] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5850] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5850] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5850] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5850] close(3)                    = 0
[pid  5850] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5850] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5850] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5850] exit_group(0)               = ?
[pid  5850] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5850, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=11 /* 0.11 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5852 attached
, child_tidptr=0x55558cd07650) = 5852
[pid  5852] set_robust_list(0x55558cd07660, 24) = 0
[pid  5852] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   82.072846][ T5850] overlay: filesystem on ./bus not supported as upperdir
[pid  5852] setpgid(0, 0)               = 0
[pid  5852] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5852] write(3, "1000", 4)         = 4
[pid  5852] close(3)                    = 0
executing program
[pid  5852] write(1, "executing program\n", 18) = 18
[pid  5852] memfd_create("syzkaller", 0) = 3
[pid  5852] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5852] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5852] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5852] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5852] close(3)                    = 0
[pid  5852] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5852] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5852] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5852] exit_group(0)               = ?
[pid  5852] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5852, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5853 attached
 <unfinished ...>
[pid  5853] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5853
[pid  5853] <... set_robust_list resumed>) = 0
[pid  5853] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   82.324500][ T5852] overlay: filesystem on ./bus not supported as upperdir
[pid  5853] setpgid(0, 0)               = 0
[pid  5853] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5853] write(3, "1000", 4)         = 4
[pid  5853] close(3)                    = 0
executing program
[pid  5853] write(1, "executing program\n", 18) = 18
[pid  5853] memfd_create("syzkaller", 0) = 3
[pid  5853] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5853] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5853] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5853] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5853] close(3)                    = 0
[pid  5853] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5853] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5853] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5853] exit_group(0)               = ?
[pid  5853] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5853, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5855 attached
, child_tidptr=0x55558cd07650) = 5855
[pid  5855] set_robust_list(0x55558cd07660, 24) = 0
[   82.577067][ T5853] overlay: filesystem on ./bus not supported as upperdir
[pid  5855] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5855] setpgid(0, 0)               = 0
[pid  5855] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5855] write(3, "1000", 4)         = 4
[pid  5855] close(3)                    = 0
executing program
[pid  5855] write(1, "executing program\n", 18) = 18
[pid  5855] memfd_create("syzkaller", 0) = 3
[pid  5855] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5855] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5855] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5855] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5855] close(3)                    = 0
[pid  5855] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5855] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5855] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5855] exit_group(0)               = ?
[pid  5855] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5855, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55558cd07650) = 5857
./strace-static-x86_64: Process 5857 attached
[pid  5857] set_robust_list(0x55558cd07660, 24) = 0
[pid  5857] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5857] setpgid(0, 0)               = 0
[pid  5857] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5857] write(3, "1000", 4)         = 4
[   82.858372][ T5855] overlay: filesystem on ./bus not supported as upperdir
[pid  5857] close(3)                    = 0
executing program
[pid  5857] write(1, "executing program\n", 18) = 18
[pid  5857] memfd_create("syzkaller", 0) = 3
[pid  5857] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5857] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5857] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5857] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5857] close(3)                    = 0
[pid  5857] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5857] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5857] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5857] exit_group(0)               = ?
[pid  5857] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5857, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=8 /* 0.08 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5859 attached
, child_tidptr=0x55558cd07650) = 5859
[pid  5859] set_robust_list(0x55558cd07660, 24) = 0
[pid  5859] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   83.121998][ T5857] overlay: filesystem on ./bus not supported as upperdir
[pid  5859] setpgid(0, 0)               = 0
[pid  5859] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5859] write(3, "1000", 4)         = 4
[pid  5859] close(3)                    = 0
[pid  5859] write(1, "executing program\n", 18executing program
) = 18
[pid  5859] memfd_create("syzkaller", 0) = 3
[pid  5859] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5859] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5859] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5859] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5859] close(3)                    = 0
[pid  5859] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5859] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5859] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5859] exit_group(0)               = ?
[pid  5859] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5859, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=12 /* 0.12 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5861 attached
, child_tidptr=0x55558cd07650) = 5861
[pid  5861] set_robust_list(0x55558cd07660, 24) = 0
[pid  5861] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5861] setpgid(0, 0)               = 0
[pid  5861] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5861] write(3, "1000", 4)         = 4
[   83.347583][ T5859] overlay: filesystem on ./bus not supported as upperdir
[pid  5861] close(3)                    = 0
[pid  5861] write(1, "executing program\n", 18) = 18
executing program
[pid  5861] memfd_create("syzkaller", 0) = 3
[pid  5861] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5861] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5861] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5861] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5861] close(3)                    = 0
[pid  5861] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5861] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5861] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5861] exit_group(0)               = ?
[pid  5861] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5861, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5862 attached
, child_tidptr=0x55558cd07650) = 5862
[   83.597794][ T5861] overlay: filesystem on ./bus not supported as upperdir
[pid  5862] set_robust_list(0x55558cd07660, 24) = 0
[pid  5862] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5862] setpgid(0, 0)               = 0
[pid  5862] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5862] write(3, "1000", 4)         = 4
[pid  5862] close(3)                    = 0
[pid  5862] write(1, "executing program\n", 18executing program
) = 18
[pid  5862] memfd_create("syzkaller", 0) = 3
[pid  5862] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5862] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5862] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5862] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5862] close(3)                    = 0
[pid  5862] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5862] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5862] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5862] exit_group(0)               = ?
[pid  5862] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5862, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5863 attached
, child_tidptr=0x55558cd07650) = 5863
[pid  5863] set_robust_list(0x55558cd07660, 24) = 0
[pid  5863] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[   83.893009][ T5862] overlay: filesystem on ./bus not supported as upperdir
[pid  5863] setpgid(0, 0)               = 0
[pid  5863] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5863] write(3, "1000", 4)         = 4
[pid  5863] close(3)                    = 0
executing program
[pid  5863] write(1, "executing program\n", 18) = 18
[pid  5863] memfd_create("syzkaller", 0) = 3
[pid  5863] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5863] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5863] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5863] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5863] close(3)                    = 0
[pid  5863] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5863] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5863] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5863] exit_group(0)               = ?
[pid  5863] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5863, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=10 /* 0.10 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5864 attached
 <unfinished ...>
[pid  5864] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5864
[pid  5864] <... set_robust_list resumed>) = 0
[pid  5864] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5864] setpgid(0, 0)               = 0
[pid  5864] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5864] write(3, "1000", 4)         = 4
[   84.164714][ T5863] overlay: filesystem on ./bus not supported as upperdir
[pid  5864] close(3)                    = 0
executing program
[pid  5864] write(1, "executing program\n", 18) = 18
[pid  5864] memfd_create("syzkaller", 0) = 3
[pid  5864] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5864] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5864] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5864] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5864] close(3)                    = 0
[pid  5864] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5864] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5864] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5864] exit_group(0)               = ?
[pid  5864] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5864, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=10 /* 0.10 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5865 attached
, child_tidptr=0x55558cd07650) = 5865
[pid  5865] set_robust_list(0x55558cd07660, 24) = 0
[   84.427528][ T5864] overlay: filesystem on ./bus not supported as upperdir
[pid  5865] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5865] setpgid(0, 0)               = 0
[pid  5865] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5865] write(3, "1000", 4)         = 4
[pid  5865] close(3)                    = 0
executing program
[pid  5865] write(1, "executing program\n", 18) = 18
[pid  5865] memfd_create("syzkaller", 0) = 3
[pid  5865] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5865] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5865] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5865] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5865] close(3)                    = 0
[pid  5865] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5865] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5865] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5865] exit_group(0)               = ?
[pid  5865] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5865, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   84.687749][ T5865] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5866 attached
, child_tidptr=0x55558cd07650) = 5866
[pid  5866] set_robust_list(0x55558cd07660, 24) = 0
[pid  5866] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5866] setpgid(0, 0)               = 0
[pid  5866] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5866] write(3, "1000", 4)         = 4
[pid  5866] close(3)                    = 0
executing program
[pid  5866] write(1, "executing program\n", 18) = 18
[pid  5866] memfd_create("syzkaller", 0) = 3
[pid  5866] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5866] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5866] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5866] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5866] close(3)                    = 0
[pid  5866] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5866] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5866] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5866] exit_group(0)               = ?
[pid  5866] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5866, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5867 attached
 <unfinished ...>
[pid  5867] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5867
[pid  5867] <... set_robust_list resumed>) = 0
[pid  5867] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5867] setpgid(0, 0)               = 0
[pid  5867] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5867] write(3, "1000", 4)         = 4
[   84.967553][ T5866] overlay: filesystem on ./bus not supported as upperdir
[pid  5867] close(3)                    = 0
executing program
[pid  5867] write(1, "executing program\n", 18) = 18
[pid  5867] memfd_create("syzkaller", 0) = 3
[pid  5867] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5867] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5867] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5867] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5867] close(3)                    = 0
[pid  5867] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5867] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5867] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5867] exit_group(0)               = ?
[pid  5867] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5867, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5868 attached
, child_tidptr=0x55558cd07650) = 5868
[pid  5868] set_robust_list(0x55558cd07660, 24) = 0
[pid  5868] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5868] setpgid(0, 0)               = 0
[pid  5868] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5868] write(3, "1000", 4)         = 4
[   85.177777][ T5867] overlay: filesystem on ./bus not supported as upperdir
[pid  5868] close(3)                    = 0
executing program
[pid  5868] write(1, "executing program\n", 18) = 18
[pid  5868] memfd_create("syzkaller", 0) = 3
[pid  5868] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5868] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5868] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5868] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5868] close(3)                    = 0
[pid  5868] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5868] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5868] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5868] exit_group(0)               = ?
[pid  5868] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5868, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=12 /* 0.12 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55558cd07650) = 5869
./strace-static-x86_64: Process 5869 attached
[   85.437309][ T5868] overlay: filesystem on ./bus not supported as upperdir
[pid  5869] set_robust_list(0x55558cd07660, 24) = 0
[pid  5869] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5869] setpgid(0, 0)               = 0
[pid  5869] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5869] write(3, "1000", 4)         = 4
[pid  5869] close(3)                    = 0
[pid  5869] write(1, "executing program\n", 18executing program
) = 18
[pid  5869] memfd_create("syzkaller", 0) = 3
[pid  5869] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5869] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5869] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5869] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5869] close(3)                    = 0
[pid  5869] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5869] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5869] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5869] exit_group(0)               = ?
[pid  5869] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5869, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   85.738802][ T5869] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5870 attached
, child_tidptr=0x55558cd07650) = 5870
[pid  5870] set_robust_list(0x55558cd07660, 24) = 0
[pid  5870] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5870] setpgid(0, 0)               = 0
[pid  5870] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5870] write(3, "1000", 4)         = 4
[pid  5870] close(3)                    = 0
[pid  5870] write(1, "executing program\n", 18executing program
) = 18
[pid  5870] memfd_create("syzkaller", 0) = 3
[pid  5870] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5870] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5870] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5870] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5870] close(3)                    = 0
[pid  5870] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5870] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5870] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5870] exit_group(0)               = ?
[pid  5870] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5870, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   86.052377][ T5870] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5871 attached
, child_tidptr=0x55558cd07650) = 5871
[pid  5871] set_robust_list(0x55558cd07660, 24) = 0
[pid  5871] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5871] setpgid(0, 0)               = 0
[pid  5871] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5871] write(3, "1000", 4)         = 4
[pid  5871] close(3)                    = 0
executing program
[pid  5871] write(1, "executing program\n", 18) = 18
[pid  5871] memfd_create("syzkaller", 0) = 3
[pid  5871] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5871] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5871] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5871] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5871] close(3)                    = 0
[pid  5871] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5871] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5871] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5871] exit_group(0)               = ?
[pid  5871] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5871, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   86.344075][ T5871] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55558cd07650) = 5872
./strace-static-x86_64: Process 5872 attached
[pid  5872] set_robust_list(0x55558cd07660, 24) = 0
[pid  5872] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5872] setpgid(0, 0executing program
)               = 0
[pid  5872] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5872] write(3, "1000", 4)         = 4
[pid  5872] close(3)                    = 0
[pid  5872] write(1, "executing program\n", 18) = 18
[pid  5872] memfd_create("syzkaller", 0) = 3
[pid  5872] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5872] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5872] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5872] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5872] close(3)                    = 0
[pid  5872] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5872] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5872] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5872] exit_group(0)               = ?
[pid  5872] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5872, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5874 attached
, child_tidptr=0x55558cd07650) = 5874
[pid  5874] set_robust_list(0x55558cd07660, 24) = 0
[   86.637930][ T5872] overlay: filesystem on ./bus not supported as upperdir
[   86.664348][   T43] cfg80211: failed to load regulatory.db
[pid  5874] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5874] setpgid(0, 0)               = 0
[pid  5874] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5874] write(3, "1000", 4)         = 4
[pid  5874] close(3)                    = 0
executing program
[pid  5874] write(1, "executing program\n", 18) = 18
[pid  5874] memfd_create("syzkaller", 0) = 3
[pid  5874] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5874] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5874] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5874] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5874] close(3)                    = 0
[pid  5874] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5874] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5874] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5874] exit_group(0)               = ?
[pid  5874] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5874, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=12 /* 0.12 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5875 attached
, child_tidptr=0x55558cd07650) = 5875
[   86.922196][ T5874] overlay: filesystem on ./bus not supported as upperdir
[pid  5875] set_robust_list(0x55558cd07660, 24) = 0
[pid  5875] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5875] setpgid(0, 0)               = 0
[pid  5875] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5875] write(3, "1000", 4)         = 4
[pid  5875] close(3)                    = 0
executing program
[pid  5875] write(1, "executing program\n", 18) = 18
[pid  5875] memfd_create("syzkaller", 0) = 3
[pid  5875] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5875] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5875] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5875] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5875] close(3)                    = 0
[pid  5875] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5875] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5875] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5875] exit_group(0)               = ?
[pid  5875] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5875, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5876 attached
, child_tidptr=0x55558cd07650) = 5876
[   87.184907][ T5875] overlay: filesystem on ./bus not supported as upperdir
[pid  5876] set_robust_list(0x55558cd07660, 24) = 0
[pid  5876] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5876] setpgid(0, 0)               = 0
[pid  5876] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5876] write(3, "1000", 4)         = 4
[pid  5876] close(3)                    = 0
executing program
[pid  5876] write(1, "executing program\n", 18) = 18
[pid  5876] memfd_create("syzkaller", 0) = 3
[pid  5876] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5876] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5876] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5876] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5876] close(3)                    = 0
[pid  5876] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5876] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5876] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5876] exit_group(0)               = ?
[pid  5876] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5876, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5877 attached
, child_tidptr=0x55558cd07650) = 5877
[   87.454883][ T5876] overlay: filesystem on ./bus not supported as upperdir
[pid  5877] set_robust_list(0x55558cd07660, 24) = 0
[pid  5877] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5877] setpgid(0, 0)               = 0
[pid  5877] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5877] write(3, "1000", 4)         = 4
[pid  5877] close(3)                    = 0
[pid  5877] write(1, "executing program\n", 18executing program
) = 18
[pid  5877] memfd_create("syzkaller", 0) = 3
[pid  5877] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5877] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5877] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5877] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5877] close(3)                    = 0
[pid  5877] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5877] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5877] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5877] exit_group(0)               = ?
[pid  5877] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5877, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5878 attached
 <unfinished ...>
[pid  5878] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5878
[pid  5878] <... set_robust_list resumed>) = 0
[pid  5878] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5878] setpgid(0, 0)               = 0
[   87.714282][ T5877] overlay: filesystem on ./bus not supported as upperdir
[pid  5878] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5878] write(3, "1000", 4)         = 4
[pid  5878] close(3)                    = 0
executing program
[pid  5878] write(1, "executing program\n", 18) = 18
[pid  5878] memfd_create("syzkaller", 0) = 3
[pid  5878] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5878] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5878] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5878] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5878] close(3)                    = 0
[pid  5878] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5878] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5878] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5878] exit_group(0)               = ?
[pid  5878] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5878, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=10 /* 0.10 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5879 attached
, child_tidptr=0x55558cd07650) = 5879
[pid  5879] set_robust_list(0x55558cd07660, 24) = 0
[pid  5879] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5879] setpgid(0, 0)               = 0
[pid  5879] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5879] write(3, "1000", 4)         = 4
[   87.961722][ T5878] overlay: filesystem on ./bus not supported as upperdir
[pid  5879] close(3)                    = 0
[pid  5879] write(1, "executing program\n", 18executing program
) = 18
[pid  5879] memfd_create("syzkaller", 0) = 3
[pid  5879] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5879] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5879] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5879] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5879] close(3)                    = 0
[pid  5879] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5879] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5879] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5879] exit_group(0)               = ?
[pid  5879] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5879, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=8 /* 0.08 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   88.174903][ T5879] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55558cd07650) = 5880
./strace-static-x86_64: Process 5880 attached
[pid  5880] set_robust_list(0x55558cd07660, 24) = 0
[pid  5880] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5880] setpgid(0, 0)               = 0
[pid  5880] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5880] write(3, "1000", 4)         = 4
[pid  5880] close(3)                    = 0
[pid  5880] write(1, "executing program\n", 18executing program
) = 18
[pid  5880] memfd_create("syzkaller", 0) = 3
[pid  5880] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5880] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5880] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5880] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5880] close(3)                    = 0
[pid  5880] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5880] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5880] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5880] exit_group(0)               = ?
[pid  5880] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5880, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=11 /* 0.11 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5881 attached
 <unfinished ...>
[pid  5881] set_robust_list(0x55558cd07660, 24 <unfinished ...>
[pid  5837] <... clone resumed>, child_tidptr=0x55558cd07650) = 5881
[pid  5881] <... set_robust_list resumed>) = 0
[pid  5881] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5881] setpgid(0, 0)               = 0
[   88.463463][ T5880] overlay: filesystem on ./bus not supported as upperdir
[pid  5881] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5881] write(3, "1000", 4)         = 4
[pid  5881] close(3)                    = 0
[pid  5881] write(1, "executing program\n", 18executing program
) = 18
[pid  5881] memfd_create("syzkaller", 0) = 3
[pid  5881] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5881] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5881] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5881] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5881] close(3)                    = 0
[pid  5881] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5881] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5881] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5881] exit_group(0)               = ?
[pid  5881] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5881, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=8 /* 0.08 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5882 attached
, child_tidptr=0x55558cd07650) = 5882
[pid  5882] set_robust_list(0x55558cd07660, 24) = 0
[   88.741335][ T5881] overlay: filesystem on ./bus not supported as upperdir
[pid  5882] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5882] setpgid(0, 0)               = 0
[pid  5882] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5882] write(3, "1000", 4)         = 4
[pid  5882] close(3executing program
)                    = 0
[pid  5882] write(1, "executing program\n", 18) = 18
[pid  5882] memfd_create("syzkaller", 0) = 3
[pid  5882] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5882] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216
[pid  5882] munmap(0x7fbbc4a00000, 138412032) = 0
[pid  5882] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy)
[pid  5882] close(3)                    = 0
[pid  5882] mkdirat(AT_FDCWD, "./file0", 000) = -1 EEXIST (File exists)
[pid  5882] mkdirat(AT_FDCWD, "./bus", 000) = -1 EEXIST (File exists)
[pid  5882] mount(NULL, "./bus", "overlay", MS_NOEXEC|MS_RELATIME, "workdir=./bus,lowerdir=.,upperdir=./file0,") = -1 EINVAL (Invalid argument)
[pid  5882] exit_group(0)               = ?
[pid  5882] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5882, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=9 /* 0.09 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR)  = -1 EBUSY (Device or resource busy)
[   89.006865][ T5882] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55558cd07650) = 5883
./strace-static-x86_64: Process 5883 attached
[pid  5883] set_robust_list(0x55558cd07660, 24) = 0
[pid  5883] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5883] setpgid(0, 0)               = 0
[pid  5883] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  5883] write(3, "1000", 4)         = 4
[pid  5883] close(3)                    = 0
executing program
[pid  5883] write(1, "executing program\n", 18) = 18
[pid  5883] memfd_create("syzkaller", 0) = 3
[pid  5883] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbbc4a00000
[pid  5883] write(3, "\x02\x02\x02\x02\x02\x02\x02\x02\x74\x68\x69\x73\x20\x69\x73\x20\x61\x6e\x20\x6f\x63\x66\x73\x32\x20\x76\x6f\x6c\x75\x6d\x65\x00\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"..., 16777216) = 16777216