./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3644794997 <...> syzkaller login: [ 109.521659][ T9] cfg80211: failed to load regulatory.db Warning: Permanently added '10.128.1.63' (ED25519) to the list of known hosts. execve("./syz-executor3644794997", ["./syz-executor3644794997"], 0x7ffc0f82e760 /* 10 vars */) = 0 brk(NULL) = 0x555569588000 brk(0x555569588d00) = 0x555569588d00 arch_prctl(ARCH_SET_FS, 0x555569588380) = 0 set_tid_address(0x555569588650) = 5826 set_robust_list(0x555569588660, 24) = 0 rseq(0x555569588ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3644794997", 4096) = 28 getrandom("\x5c\x66\x44\x04\x3b\x8a\x4b\x0c", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555569588d00 brk(0x5555695a9d00) = 0x5555695a9d00 brk(0x5555695aa000) = 0x5555695aa000 mprotect(0x7fe768194000, 16384, PROT_READ) = 0 mmap(0x3ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3ffffffff000 mmap(0x400000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400000000000 mmap(0x400001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400001000000 unshare(CLONE_NEWPID) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555569588650) = 5827 ./strace-static-x86_64: Process 5827 attached [pid 5827] set_robust_list(0x555569588660, 24) = 0 [pid 5827] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5827] getppid() = 0 [pid 5827] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5827] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5827] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5827] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5827] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5827] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5827] unshare(CLONE_NEWNS) = 0 [pid 5827] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5827] unshare(CLONE_NEWIPC) = 0 [pid 5827] unshare(CLONE_NEWCGROUP) = 0 [pid 5827] unshare(CLONE_NEWUTS) = 0 [pid 5827] unshare(CLONE_SYSVSEM) = 0 [pid 5827] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "16777216", 8) = 8 [pid 5827] close(3) = 0 [pid 5827] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "536870912", 9) = 9 [pid 5827] close(3) = 0 [pid 5827] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "1024", 4) = 4 [pid 5827] close(3) = 0 [pid 5827] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "8192", 4) = 4 [pid 5827] close(3) = 0 [pid 5827] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "1024", 4) = 4 [pid 5827] close(3) = 0 [pid 5827] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "1024", 4) = 4 [pid 5827] close(3) = 0 [pid 5827] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5827] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5827] close(3) = 0 [pid 5827] getpid() = 1 [pid 5827] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<s_umount_key#45){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 [ 113.388991][ T5827] [ 113.388991][ T5827] which lock already depends on the new lock. [ 113.388991][ T5827] [ 113.404260][ T5827] [ 113.404260][ T5827] the existing dependency chain (in reverse order) is: [ 113.415181][ T5827] [ 113.415181][ T5827] -> #2 (&type->s_umount_key#45){++++}-{4:4}: [ 113.426258][ T5827] lock_acquire+0x1ed/0x550 [ 113.432051][ T5827] down_read+0xb1/0xa40 [ 113.440552][ T5827] ocfs2_finish_quota_recovery+0x15c/0x22a0 [ 113.454154][ T5827] ocfs2_complete_recovery+0x17c1/0x25c0 [ 113.463905][ T5827] process_scheduled_works+0xabe/0x18e0 [ 113.470330][ T5827] worker_thread+0x870/0xd30 [ 113.475985][ T5827] kthread+0x7a9/0x920 [ 113.481956][ T5827] ret_from_fork+0x4b/0x80 [ 113.488208][ T5827] ret_from_fork_asm+0x1a/0x30 [ 113.494749][ T5827] [ 113.494749][ T5827] -> #1 ((work_completion)(&journal->j_recovery_work)){+.+.}-{0:0}: [ 113.512370][ T5827] lock_acquire+0x1ed/0x550 [ 113.519852][ T5827] process_scheduled_works+0x9e4/0x18e0 [ 113.529224][ T5827] worker_thread+0x870/0xd30 [ 113.534678][ T5827] kthread+0x7a9/0x920 [ 113.540297][ T5827] ret_from_fork+0x4b/0x80 [ 113.551780][ T5827] ret_from_fork_asm+0x1a/0x30 [ 113.557323][ T5827] [ 113.557323][ T5827] -> #0 ((wq_completion)ocfs2_wq){+.+.}-{0:0}: [ 113.570345][ T5827] validate_chain+0x18ef/0x5920 [ 113.576607][ T5827] __lock_acquire+0x1397/0x2100 [ 113.585259][ T5827] lock_acquire+0x1ed/0x550 [ 113.595115][ T5827] touch_wq_lockdep_map+0xc7/0x170 [ 113.602395][ T5827] __flush_workqueue+0x14a/0x1280 [ 113.610013][ T5827] ocfs2_shutdown_local_alloc+0x109/0xa90 [ 113.616559][ T5827] ocfs2_dismount_volume+0x202/0x910 [ 113.627864][ T5827] generic_shutdown_super+0x139/0x2d0 [ 113.640194][ T5827] kill_block_super+0x44/0x90 [ 113.647939][ T5827] deactivate_locked_super+0xc4/0x130 [ 113.654390][ T5827] cleanup_mnt+0x41f/0x4b0 [ 113.660987][ T5827] task_work_run+0x24f/0x310 [ 113.668895][ T5827] do_exit+0xa2a/0x28e0 [ 113.675003][ T5827] do_group_exit+0x207/0x2c0 [ 113.682352][ T5827] __x64_sys_exit_group+0x3f/0x40 [ 113.690910][ T5827] x64_sys_call+0x26a8/0x26b0 [ 113.697312][ T5827] do_syscall_64+0xf3/0x230 [ 113.704412][ T5827] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 113.712096][ T5827] [ 113.712096][ T5827] other info that might help us debug this: [ 113.712096][ T5827] [ 113.725760][ T5827] Chain exists of: [ 113.725760][ T5827] (wq_completion)ocfs2_wq --> (work_completion)(&journal->j_recovery_work) --> &type->s_umount_key#45 [ 113.725760][ T5827] [ 113.751969][ T5827] Possible unsafe locking scenario: [ 113.751969][ T5827] [ 113.760991][ T5827] CPU0 CPU1 [ 113.769169][ T5827] ---- ---- [ 113.775321][ T5827] lock(&type->s_umount_key#45); [ 113.786967][ T5827] lock((work_completion)(&journal->j_recovery_work)); [ 113.803373][ T5827] lock(&type->s_umount_key#45); [ 113.812841][ T5827] lock((wq_completion)ocfs2_wq); [ 113.821961][ T5827] [ 113.821961][ T5827] *** DEADLOCK *** [ 113.821961][ T5827] [ 113.834691][ T5827] 1 lock held by syz-executor364/5827: [ 113.843291][ T5827] #0: ffff888035fc60e0 (&type->s_umount_key#45){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 [ 113.858773][ T5827] [ 113.858773][ T5827] stack backtrace: [ 113.865473][ T5827] CPU: 0 UID: 0 PID: 5827 Comm: syz-executor364 Not tainted 6.14.0-rc2-syzkaller-00253-g78a632a2086c #0 [ 113.865487][ T5827] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 [ 113.865499][ T5827] Call Trace: [ 113.865505][ T5827] [ 113.865514][ T5827] dump_stack_lvl+0x241/0x360 [ 113.865530][ T5827] ? __pfx_dump_stack_lvl+0x10/0x10 [ 113.865539][ T5827] ? __pfx__printk+0x10/0x10 [ 113.865554][ T5827] print_circular_bug+0x13a/0x1b0 [ 113.865565][ T5827] check_noncircular+0x36a/0x4a0 [ 113.865573][ T5827] ? __lock_acquire+0x1397/0x2100 [ 113.865586][ T5827] ? __pfx_check_noncircular+0x10/0x10 [ 113.865595][ T5827] ? lockdep_lock+0x123/0x2b0 [ 113.865606][ T5827] ? mark_lock+0x9a/0x360 [ 113.865620][ T5827] validate_chain+0x18ef/0x5920 [ 113.865633][ T5827] ? __pfx_validate_chain+0x10/0x10 [ 113.865646][ T5827] ? debug_object_assert_init+0x2dd/0x4b0 [ 113.865658][ T5827] ? do_raw_spin_lock+0x14f/0x370 [ 113.865667][ T5827] ? __pfx_lock_release+0x10/0x10 [ 113.865680][ T5827] ? mark_lock+0x9a/0x360 [ 113.865693][ T5827] __lock_acquire+0x1397/0x2100 [ 113.865706][ T5827] ? kfree+0x196/0x430 [ 113.865719][ T5827] ? ocfs2_dismount_volume+0x1bd/0x910 [ 113.865733][ T5827] lock_acquire+0x1ed/0x550 [ 113.865745][ T5827] ? touch_wq_lockdep_map+0xb1/0x170 [ 113.865758][ T5827] ? __pfx_lock_acquire+0x10/0x10 [ 113.865769][ T5827] ? __asan_memset+0x23/0x50 [ 113.865779][ T5827] ? lockdep_init_map_type+0xa1/0x910 [ 113.865793][ T5827] ? __pfx_lockdep_init_map_type+0x10/0x10 [ 113.865807][ T5827] ? __lock_acquire+0x1397/0x2100 [ 113.865820][ T5827] ? touch_wq_lockdep_map+0xb1/0x170 [ 113.865831][ T5827] touch_wq_lockdep_map+0xc7/0x170 [ 113.865843][ T5827] ? touch_wq_lockdep_map+0xb1/0x170 [ 113.865854][ T5827] __flush_workqueue+0x14a/0x1280 [ 113.865866][ T5827] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 113.865880][ T5827] ? __pfx___flush_workqueue+0x10/0x10 [ 113.865894][ T5827] ? mark_lock+0x9a/0x360 [ 113.865907][ T5827] ocfs2_shutdown_local_alloc+0x109/0xa90 [ 113.865921][ T5827] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 113.865934][ T5827] ? __pfx_ocfs2_shutdown_local_alloc+0x10/0x10 [ 113.865946][ T5827] ? lockdep_hardirqs_on+0x99/0x150 [ 113.865956][ T5827] ? enable_work+0x2e3/0x360 [ 113.865968][ T5827] ? __pfx_enable_work+0x10/0x10 [ 113.865979][ T5827] ? _atomic_dec_and_lock+0x9a/0x130 [ 113.865990][ T5827] ? iput+0x3be/0xa50 [ 113.866000][ T5827] ocfs2_dismount_volume+0x202/0x910 [ 113.866013][ T5827] ? __pfx_ocfs2_dismount_volume+0x10/0x10 [ 113.866024][ T5827] ? __pfx_evict_inodes+0x10/0x10 [ 113.866033][ T5827] ? __pfx_ocfs2_put_super+0x10/0x10 [ 113.866068][ T5827] generic_shutdown_super+0x139/0x2d0 [ 113.866079][ T5827] kill_block_super+0x44/0x90 [ 113.866091][ T5827] deactivate_locked_super+0xc4/0x130 [ 113.866101][ T5827] cleanup_mnt+0x41f/0x4b0 [ 113.866111][ T5827] ? lockdep_hardirqs_on+0x99/0x150 [ 113.866121][ T5827] task_work_run+0x24f/0x310 [ 113.866136][ T5827] ? __pfx_task_work_run+0x10/0x10 [ 113.866148][ T5827] ? do_exit+0xa25/0x28e0 [ 113.866161][ T5827] ? do_exit+0xa25/0x28e0 [ 113.866172][ T5827] do_exit+0xa2a/0x28e0 [ 113.866186][ T5827] ? __pfx_do_exit+0x10/0x10 [ 113.866196][ T5827] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 113.866209][ T5827] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 113.866222][ T5827] ? _raw_spin_unlock_irq+0x23/0x50 [ 113.866231][ T5827] ? lockdep_hardirqs_on+0x99/0x150 [ 113.866240][ T5827] do_group_exit+0x207/0x2c0 [ 113.866253][ T5827] __x64_sys_exit_group+0x3f/0x40 [ 113.866265][ T5827] x64_sys_call+0x26a8/0x26b0 [ 113.866275][ T5827] do_syscall_64+0xf3/0x230 [ 113.866286][ T5827] ? clear_bhb_loop+0x35/0x90 [ 113.866299][ T5827] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 113.866312][ T5827] RIP: 0033:0x7fe768119c09 [ 113.866327][ T5827] Code: Unable to access opcode bytes at 0x7fe768119bdf. [pid 5827] +++ exited with 1 +++ [ 113.866332][ T5827] RSP: 002b:00007ffff1ea5ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 113.866343][ T5827] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fe768119c09 [ 113.866349][ T5827] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 113.866354][ T5827] RBP: 00007fe76819a2b0 R08: ffffffffffffffb8 R09: 0000000000004701 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5827, si_uid=0, si_status=1, si_utime=2 /* 0.02 s */, si_stime=25 /* 0.25 s */} --- exit_group(0) = ? +++ exited with 0 +++ [ 113.866360][ T5827] R10: 0000000000000000 R11: 0000000000000246 R1