./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3655593862

<...>
Warning: Permanently added '10.128.1.174' (ED25519) to the list of known hosts.
execve("./syz-executor3655593862", ["./syz-executor3655593862"], 0x7fffb72bd120 /* 10 vars */) = 0
brk(NULL)                               = 0x55555c747000
brk(0x55555c747d00)                     = 0x55555c747d00
arch_prctl(ARCH_SET_FS, 0x55555c747380) = 0
set_tid_address(0x55555c747650)         = 5836
set_robust_list(0x55555c747660, 24)     = 0
rseq(0x55555c747ca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor3655593862", 4096) = 28
getrandom("\xa0\x01\xbe\x89\x1b\x80\x74\xf4", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55555c747d00
brk(0x55555c768d00)                     = 0x55555c768d00
brk(0x55555c769000)                     = 0x55555c769000
mprotect(0x7f147e816000, 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
mount(NULL, "/proc/sys/fs/binfmt_misc", "binfmt_misc", 0, NULL) = -1 EBUSY (Device or resource busy)
openat(AT_FDCWD, "/proc/sys/fs/binfmt_misc/register", O_WRONLY|O_CLOEXEC) = 3
write(3, "\x3a\x73\x79\x7a\x30\x3a\x4d\x3a\x30\x3a\x01\x3a\x3a\x2e\x2f\x66\x69\x6c\x65\x30\x3a", 21) = 21
close(3)                                = 0
openat(AT_FDCWD, "/proc/sys/fs/binfmt_misc/register", O_WRONLY|O_CLOEXEC) = 3
write(3, "\x3a\x73\x79\x7a\x31\x3a\x4d\x3a\x31\x3a\x02\x3a\x3a\x2e\x2f\x66\x69\x6c\x65\x30\x3a\x50\x4f\x43", 24) = 24
close(3)                                = 0
unshare(CLONE_NEWPID)                   = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5837 attached
 <unfinished ...>
[pid  5837] set_robust_list(0x55555c747660, 24 <unfinished ...>
[pid  5836] <... clone resumed>, child_tidptr=0x55555c747650) = 5837
[pid  5837] <... set_robust_list resumed>) = 0
[pid  5837] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5837] getppid()                   = 0
[pid  5837] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0
[pid  5837] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0
[pid  5837] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0
[pid  5837] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0
[pid  5837] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0
[pid  5837] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0
[pid  5837] unshare(CLONE_NEWNS)        = 0
[pid  5837] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0
[pid  5837] unshare(CLONE_NEWIPC)       = 0
[pid  5837] unshare(CLONE_NEWCGROUP)    = 0
[pid  5837] unshare(CLONE_NEWUTS)       = 0
[pid  5837] unshare(CLONE_SYSVSEM)      = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "16777216", 8)     = 8
[pid  5837] close(3)                    = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "536870912", 9)    = 9
[pid  5837] close(3)                    = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "1024", 4)         = 4
[pid  5837] close(3)                    = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "8192", 4)         = 4
[pid  5837] close(3)                    = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "1024", 4)         = 4
[pid  5837] close(3)                    = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "1024", 4)         = 4
[pid  5837] close(3)                    = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "1024 1048576 500 1024", 21) = 21
[pid  5837] close(3)                    = 0
[pid  5837] getpid()                    = 1
[pid  5837] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, permitted=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, inheritable=0}) = 0
[pid  5837] capset({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, permitted=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, inheritable=0}) = 0
[pid  5837] unshare(CLONE_NEWNET)       = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/net/ipv4/ping_group_range", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "0 65535", 7)      = 7
[pid  5837] close(3)                    = 0
[pid  5837] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3
[pid  5837] write(3, "100000", 6)       = 6
[pid  5837] close(3)                    = 0
[pid  5837] mkdir("./syz-tmp", 0777)    = 0
[pid  5837] mount("", "./syz-tmp", "tmpfs", 0, NULL) = 0
[pid  5837] mkdir("./syz-tmp/newroot", 0777) = 0
[pid  5837] mkdir("./syz-tmp/newroot/dev", 0700) = 0
[pid  5837] mount("/dev", "./syz-tmp/newroot/dev", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5837] mkdir("./syz-tmp/newroot/proc", 0700) = 0
[pid  5837] mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL) = 0
[pid  5837] mkdir("./syz-tmp/newroot/selinux", 0700) = 0
[pid  5837] mount("/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5837] mount("/sys/fs/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5837] mkdir("./syz-tmp/newroot/sys", 0700) = 0
[pid  5837] mount("/sys", "./syz-tmp/newroot/sys", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5837] mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5837] mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5837] mount("/proc/sys/fs/binfmt_misc", "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5837] mkdir("./syz-tmp/newroot/syz-inputs", 0700) = 0
[pid  5837] mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL, MS_RDONLY|MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5837] mkdir("./syz-tmp/pivot", 0777) = 0
[pid  5837] pivot_root("./syz-tmp", "./syz-tmp/pivot") = 0
[pid  5837] chdir("/")                  = 0
[pid  5837] umount2("./pivot", MNT_DETACH) = 0
[pid  5837] chroot("./newroot")         = 0
[pid  5837] chdir("/")                  = 0
[pid  5837] mkdir("/dev/gadgetfs", 0777) = 0
[pid  5837] mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL) = 0
[pid  5837] mkdir("/dev/binderfs", 0777) = 0
[pid  5837] mount("binder", "/dev/binderfs", "binder", 0, NULL) = 0
[pid  5837] symlink("/dev/binderfs", "./binderfs") = 0
[pid  5837] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy)
[pid  5837] write(1, "executing program\n", 18executing program
) = 18
[pid  5837] openat(AT_FDCWD, "/proc/sys/fs/binfmt_misc/syz0", O_RDWR) = 3
[   77.345939][ T5837] 
[   77.348303][ T5837] ============================================
[   77.354441][ T5837] WARNING: possible recursive locking detected
[   77.360581][ T5837] 6.16.0-rc4-next-20250702-syzkaller #0 Not tainted
[   77.367148][ T5837] --------------------------------------------
[   77.373285][ T5837] syz-executor365/5837 is trying to acquire lock:
[   77.379675][ T5837] ffff8880792cc650 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: __simple_recursive_removal+0x95/0x510
[   77.390826][ T5837] 
[   77.390826][ T5837] but task is already holding lock:
[   77.398173][ T5837] ffff888027bf0148 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: bm_entry_write+0x289/0x540
[   77.408360][ T5837] 
[   77.408360][ T5837] other info that might help us debug this:
[   77.416410][ T5837]  Possible unsafe locking scenario:
[   77.416410][ T5837] 
[   77.423844][ T5837]        CPU0
[   77.427109][ T5837]        ----
[   77.430373][ T5837]   lock(&sb->s_type->i_mutex_key#15);
[   77.435826][ T5837]   lock(&sb->s_type->i_mutex_key#15);
[   77.441277][ T5837] 
[   77.441277][ T5837]  *** DEADLOCK ***
[   77.441277][ T5837] 
[   77.449409][ T5837]  May be due to missing lock nesting notation
[   77.449409][ T5837] 
[   77.457713][ T5837] 2 locks held by syz-executor365/5837:
[   77.463242][ T5837]  #0: ffff88807e5fc428 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x211/0xa90
[   77.472112][ T5837]  #1: ffff888027bf0148 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: bm_entry_write+0x289/0x540
[   77.482720][ T5837] 
[   77.482720][ T5837] stack backtrace:
[   77.488610][ T5837] CPU: 0 UID: 0 PID: 5837 Comm: syz-executor365 Not tainted 6.16.0-rc4-next-20250702-syzkaller #0 PREEMPT(full) 
[   77.488627][ T5837] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
[   77.488641][ T5837] Call Trace:
[   77.488649][ T5837]  <TASK>
[   77.488656][ T5837]  dump_stack_lvl+0x189/0x250
[   77.488674][ T5837]  ? __pfx_dump_stack_lvl+0x10/0x10
[   77.488686][ T5837]  ? __pfx__printk+0x10/0x10
[   77.488701][ T5837]  ? print_lock_name+0xde/0x100
[   77.488715][ T5837]  print_deadlock_bug+0x28b/0x2a0
[   77.488729][ T5837]  validate_chain+0x1a3f/0x2140
[   77.488742][ T5837]  ? __lock_acquire+0xab9/0xd20
[   77.488764][ T5837]  __lock_acquire+0xab9/0xd20
[   77.488782][ T5837]  ? __simple_recursive_removal+0x95/0x510
[   77.488796][ T5837]  lock_acquire+0x120/0x360
[   77.488812][ T5837]  ? __simple_recursive_removal+0x95/0x510
[   77.488829][ T5837]  down_write+0x96/0x1f0
[   77.488849][ T5837]  ? __simple_recursive_removal+0x95/0x510
[   77.488862][ T5837]  ? __pfx_down_write+0x10/0x10
[   77.488881][ T5837]  __simple_recursive_removal+0x95/0x510
[   77.488897][ T5837]  bm_entry_write+0x4f7/0x540
[   77.488913][ T5837]  ? __pfx_bm_entry_write+0x10/0x10
[   77.488930][ T5837]  ? __pfx_bm_entry_write+0x10/0x10
[   77.488945][ T5837]  vfs_write+0x27e/0xa90
[   77.488961][ T5837]  ? __pfx_vfs_write+0x10/0x10
[   77.488975][ T5837]  ? _raw_spin_unlock_irq+0x23/0x50
[   77.488988][ T5837]  ? lockdep_hardirqs_on+0x9c/0x150
[   77.489003][ T5837]  ? _raw_spin_unlock_irq+0x2e/0x50
[   77.489017][ T5837]  ksys_write+0x145/0x250
[   77.489032][ T5837]  ? __pfx_ksys_write+0x10/0x10
[   77.489048][ T5837]  do_syscall_64+0xfa/0x3b0
[   77.489063][ T5837]  ? lockdep_hardirqs_on+0x9c/0x150
[   77.489077][ T5837]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   77.489088][ T5837]  ? clear_bhb_loop+0x60/0xb0
[   77.489101][ T5837]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   77.489114][ T5837] RIP: 0033:0x7f147e7aa369
[   77.489129][ T5837] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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
[pid  5837] write(3, "-1", 2)           = 2
[pid  5837] exit_group(1)               = ?
[pid  5837] +++ exited with 1 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5837, si_uid=0, si_status=1, si_utime=0, si_stime=9 /* 0.09 s */} ---
exit_group(0)                           = ?
+++ exited with 0 +++
[   77.489139][ T5837] RSP: 002b:00007ffed0db9fa8 EFLAGS: 00000246 ORIG_RAX