./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor760222973 <...> syzkaller syzkaller login: [ 11.798057][ T105] udevd (105) used greatest stack depth: 22912 bytes left [ 32.522667][ T30] kauditd_printk_skb: 52 callbacks suppressed [ 32.522684][ T30] audit: type=1400 audit(1746415635.940:75): avc: denied { transition } for pid=260 comm="sshd" path="/bin/sh" dev="sda1" ino=89 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 32.550450][ T30] audit: type=1400 audit(1746415635.940:76): avc: denied { noatsecure } for pid=260 comm="sshd" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 32.575023][ T30] audit: type=1400 audit(1746415635.940:77): avc: denied { write } for pid=260 comm="sh" path="pipe:[318]" dev="pipefs" ino=318 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 32.604343][ T30] audit: type=1400 audit(1746415635.940:78): avc: denied { rlimitinh } for pid=260 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 32.628799][ T30] audit: type=1400 audit(1746415635.940:79): avc: denied { siginh } for pid=260 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 34.741107][ T263] sftp-server (263) used greatest stack depth: 20672 bytes left Warning: Permanently added '10.128.1.53' (ED25519) to the list of known hosts. execve("./syz-executor760222973", ["./syz-executor760222973"], 0x7ffcc43c4fb0 /* 10 vars */) = 0 brk(NULL) = 0x55555d2b9000 brk(0x55555d2b9d40) = 0x55555d2b9d40 arch_prctl(ARCH_SET_FS, 0x55555d2b93c0) = 0 set_tid_address(0x55555d2b9690) = 278 set_robust_list(0x55555d2b96a0, 24) = 0 rseq(0x55555d2b9ce0, 0x20, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor760222973", 4096) = 27 getrandom("\xd3\xfc\x5d\xa1\xd6\x93\x09\x27", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555d2b9d40 brk(0x55555d2dad40) = 0x55555d2dad40 brk(0x55555d2db000) = 0x55555d2db000 mprotect(0x7f60c16a5000, 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, 0executing program ) = 0x200001000000 write(1, "executing program\n", 18) = 18 futex(0x7f60c16ab3cc, FUTEX_WAKE_PRIVATE, 1000000) = 0 rt_sigaction(SIGRT_1, {sa_handler=0x7f60c16417b0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f60c1632e30}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f60c15ba000 mprotect(0x7f60c15bb000, 131072, PROT_READ|PROT_WRITE) = 0 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7f60c15da990, parent_tid=0x7f60c15da990, exit_signal=0, stack=0x7f60c15ba000, stack_size=0x20300, tls=0x7f60c15da6c0}./strace-static-x86_64: Process 279 attached => {parent_tid=[279]}, 88) = 279 [pid 279] set_robust_list(0x7f60c15da9a0, 24 [pid 278] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 279] <... set_robust_list resumed>) = 0 [pid 278] futex(0x7f60c16ab3c8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 279] rt_sigprocmask(SIG_SETMASK, [], [pid 278] futex(0x7f60c16ab3cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 279] <... rt_sigprocmask resumed>NULL, 8) = 0 [ 43.149270][ T30] audit: type=1400 audit(1746415646.560:80): avc: denied { execmem } for pid=278 comm="syz-executor760" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [pid 279] openat(AT_FDCWD, "/dev/fuse", O_RDWR) = 3 [pid 279] futex(0x7f60c16ab3cc, FUTEX_WAKE_PRIVATE, 1000000 [pid 278] <... futex resumed>) = 0 [pid 278] futex(0x7f60c16ab3c8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 278] futex(0x7f60c16ab3cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 279] <... futex resumed>) = 1 [pid 279] mkdir("./file0", 0777) = 0 [pid 279] mount(NULL, "./file0", "fuse", 0, "fd=0x0000000000000003,rootmode=00000000000000000040000,user_id=00000000000000000000,group_id=0000000"...) = 0 [ 43.181060][ T30] audit: type=1400 audit(1746415646.600:81): avc: denied { read write } for pid=278 comm="syz-executor760" name="fuse" dev="devtmpfs" ino=91 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fuse_device_t tclass=chr_file permissive=1 [ 43.211522][ T30] audit: type=1400 audit(1746415646.600:82): avc: denied { open } for pid=278 comm="syz-executor760" path="/dev/fuse" dev="devtmpfs" ino=91 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fuse_device_t tclass=chr_file permissive=1 [pid 279] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY [pid 278] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [pid 278] futex(0x7f60c16ab3dc, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 278] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f60c1599000 [pid 278] mprotect(0x7f60c159a000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 278] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 [pid 278] clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7f60c15b9990, parent_tid=0x7f60c15b9990, exit_signal=0, stack=0x7f60c1599000, stack_size=0x20300, tls=0x7f60c15b96c0} => {parent_tid=[281]}, 88) = 281 [pid 278] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 278] futex(0x7f60c16ab3d8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 278] futex(0x7f60c16ab3dc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 281 attached [pid 281] set_robust_list(0x7f60c15b99a0, 24) = 0 [pid 281] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 281] read(3, "\x68\x00\x00\x00\x1a\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\x00\x00\x00\x24\x00\x00\x00\x00\x00\x02\x00\xfb\xff\xff\x73\x01\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 8192) = 104 [pid 281] write(3, "\x50\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x07\x00\x00\x00\x2b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 80) = 80 [pid 281] futex(0x7f60c16ab3dc, FUTEX_WAKE_PRIVATE, 1000000 [pid 278] <... futex resumed>) = 0 [pid 278] futex(0x7f60c16ab3d8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 278] futex(0x7f60c16ab3dc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 281] <... futex resumed>) = 1 [pid 281] read(3, "\x30\x00\x00\x00\x1b\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x17\x01\x00\x00\x00\x00\x00\x00\x00\x80\x01\x00\x00\x00\x00\x00", 8192) = 48 [pid 281] write(3, "\x20\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32 [pid 279] <... openat resumed>) = 4 [pid 279] chdir("./file0" [pid 281] <... write resumed>) = 32 [pid 281] futex(0x7f60c16ab3dc, FUTEX_WAKE_PRIVATE, 1000000 [pid 278] <... futex resumed>) = 0 [pid 278] futex(0x7f60c16ab3d8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 278] futex(0x7f60c16ab3dc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 281] <... futex resumed>) = 1 [pid 281] read(3, "\x30\x00\x00\x00\x22\x00\x00\x00\x06\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x17\x01\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00", 8192) = 48 [pid 281] write(3, "\x10\x00\x00\x00\x00\x00\x00\x00\x06\x00\x00\x00\x00\x00\x00\x00", 16 [pid 279] <... chdir resumed>) = 0 [pid 279] futex(0x7f60c16ab3cc, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 279] futex(0x7f60c16ab3c8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 281] <... write resumed>) = 16 [pid 281] futex(0x7f60c16ab3dc, FUTEX_WAKE_PRIVATE, 1000000 [pid 278] <... futex resumed>) = 0 [pid 278] futex(0x7f60c16ab3c8, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 279] <... futex resumed>) = 0 [pid 278] futex(0x7f60c16ab3cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 279] read(3, [pid 281] <... futex resumed>) = 1 [pid 281] futex(0x7f60c16ab3d8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 278] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [pid 278] futex(0x7f60c16ab3cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out) [pid 278] futex(0x7f60c16ab3d8, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 278] futex(0x7f60c16ab3dc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 281] <... futex resumed>) = 0 [pid 281] newfstatat(AT_FDCWD, "./file1", [pid 279] <... read resumed>"\x2e\x00\x00\x00\x01\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x19\x01\x00\x00\x00\x00\x00\x00\x66\x69\x6c\x65\x31\x00", 8192) = 46 [pid 279] write(3, "\xae\x00\x00\x00\x00\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00"..., 174) = 174 [pid 279] futex(0x7f60c16ab3cc, FUTEX_WAKE_PRIVATE, 1000000) = 0 [ 43.239582][ T30] audit: type=1400 audit(1746415646.630:83): avc: denied { mounton } for pid=278 comm="syz-executor760" path="/root/file0" dev="sda1" ino=1927 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 43.265764][ T30] audit: type=1400 audit(1746415646.630:84): avc: denied { mount } for pid=278 comm="syz-executor760" name="/" dev="fuse" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1 [ 43.327076][ T281] general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN [ 43.341378][ T281] KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [ 43.353912][ T281] CPU: 0 PID: 281 Comm: syz-executor760 Not tainted 5.15.180-syzkaller-00024-g88c4075c39ed #0 [ 43.367218][ T281] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 [ 43.380193][ T281] RIP: 0010:step_into+0x12e/0xd10 [ 43.386176][ T281] Code: 4c 8b 74 24 18 c6 44 24 7f 00 43 0f b6 44 25 00 84 c0 0f 85 6f 0a 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 6e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00 [ 43.413010][ T281] RSP: 0018:ffffc900009977a0 EFLAGS: 00010207 [ 43.421151][ T281] RAX: 0000000000000003 RBX: ffffc900009979e0 RCX: ffff88810d1f13c0 [ 43.431970][ T281] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 43.447204][ T281] RBP: ffffc900009978a8 R08: 0000000000000000 R09: ffffed1022325255 [ 43.459746][ T281] R10: ffffed1022325255 R11: 1ffff11022325254 R12: dffffc0000000000 [ 43.471876][ T281] R13: 1ffff92000132f43 R14: 0000000000000001 R15: 000000000000001e [ 43.482697][ T281] FS: 00007f60c15b96c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 43.492985][ T281] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.501307][ T281] CR2: 000000000045c780 CR3: 000000011d215000 CR4: 00000000003506b0 [ 43.510430][ T281] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.519150][ T281] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.528690][ T281] Call Trace: [ 43.532964][ T281] [ 43.535999][ T281] ? down_read+0xa5/0xf0 [ 43.540256][ T281] ? set_root+0x400/0x400 [ 43.544595][ T281] ? up_read+0x56/0x1d0 [ 43.549446][ T281] walk_component+0x26a/0x460 [ 43.554482][ T281] path_lookupat+0x180/0x490 [ 43.559418][ T281] filename_lookup+0x1e2/0x4f0 [ 43.564756][ T281] ? hashlen_string+0x120/0x120 [ 43.569808][ T281] user_path_at_empty+0x47/0x1c0 [ 43.575313][ T281] vfs_statx+0xfb/0xa60 [ 43.579778][ T281] ? finish_task_switch+0x16b/0x780 [ 43.585280][ T281] ? __switch_to_asm+0x3a/0x60 [ 43.591797][ T281] ? vfs_fstatat+0x40/0x40 [ 43.597838][ T281] ? __schedule+0xb76/0x14c0 [ 43.603141][ T281] ? __kasan_check_write+0x14/0x20 [ 43.608743][ T281] __se_sys_newfstatat+0xc6/0x340 [ 43.614579][ T281] ? _raw_spin_lock_irqsave+0x110/0x110 [ 43.620538][ T281] ? __x64_sys_newfstatat+0xb0/0xb0 [ 43.626598][ T281] ? cgroup_leave_frozen+0x166/0x2b0 [ 43.632354][ T281] ? ptrace_stop+0x53e/0xa80 [ 43.637041][ T281] ? ptrace_stop+0x6f4/0xa80 [ 43.641644][ T281] ? __kasan_check_write+0x14/0x20 [ 43.646935][ T281] ? switch_fpu_return+0x15d/0x2c0 [ 43.652237][ T281] __x64_sys_newfstatat+0x9b/0xb0 [ 43.657919][ T281] x64_sys_call+0x2c1/0x9a0 [ 43.662628][ T281] do_syscall_64+0x4c/0xa0 [ 43.667272][ T281] ? clear_bhb_loop+0x35/0x90 [ 43.672361][ T281] ? clear_bhb_loop+0x35/0x90 [ 43.677423][ T281] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 43.683748][ T281] RIP: 0033:0x7f60c161b8d9 [ 43.688371][ T281] 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 b0 ff ff ff f7 d8 64 89 01 48 [ 43.708974][ T281] RSP: 002b:00007f60c15b9218 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 [ 43.718245][ T281] RAX: ffffffffffffffda RBX: 00007f60c16ab3d8 RCX: 00007f60c161b8d9 [pid 279] futex(0x7f60c16ab3c8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 278] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [ 43.727934][ T281] RDX: 0000000000000000 RSI: 00002000000006c0 RDI: ffffffffffffff9c [ 43.737763][ T281] RBP: 00007f60c16ab3d0 R08: 0000000000000000 R09: 0000000000000000 [ 43.747164][ T281] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f60c167811c [ 43.755978][ T281] R13: 00002000000040c0 R14: 00002000000006c0 R15: 0000000000000000 [ 43.764958][ T281] [ 43.767981][ T281] Modules linked in: [ 43.773005][ T281] ---[ end trace 630a00737f8bedee ]--- [ 43.778781][ T281] RIP: 0010:step_into+0x12e/0xd10 [ 43.784568][ T281] Code: 4c 8b 74 24 18 c6 44 24 7f 00 43 0f b6 44 25 00 84 c0 0f 85 6f 0a 00 00 45 8b 36 4c 8b bc 24 a8 00 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 6e 0a 00 00 45 8b 3f 44 89 fe 81 e6 00 [ 43.806716][ T281] RSP: 0018:ffffc900009977a0 EFLAGS: 00010207 [ 43.813245][ T281] RAX: 0000000000000003 RBX: ffffc900009979e0 RCX: ffff88810d1f13c0 [ 43.821420][ T281] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 43.829696][ T281] RBP: ffffc900009978a8 R08: 0000000000000000 R09: ffffed1022325255 [ 43.837966][ T281] R10: ffffed1022325255 R11: 1ffff11022325254 R12: dffffc0000000000 [ 43.847355][ T281] R13: 1ffff92000132f43 R14: 0000000000000001 R15: 000000000000001e [ 43.855811][ T281] FS: 00007f60c15b96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 43.867477][ T281] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [pid 278] exit_group(0) = ? [pid 279] <... futex resumed>) = ? [pid 279] +++ exited with 0 +++ [ 43.875702][ T281] CR2: 0000564673cc7148 CR3: 000000011d215000 CR4: 00000000003506a0 [ 43.885828][ T281] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.896173][ T281] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.909074][ T281] Kernel panic - not syncing: Fatal exception [ 43.918788][ T281] Kernel Offset: disabled [ 43.924532][ T281] Rebooting in 86400 seconds..