./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2151293142 <...> Warning: Permanently added '10.128.0.246' (ED25519) to the list of known hosts. execve("./syz-executor2151293142", ["./syz-executor2151293142"], 0x7ffc412a14b0 /* 10 vars */) = 0 brk(NULL) = 0x55555b297000 brk(0x55555b297d00) = 0x55555b297d00 arch_prctl(ARCH_SET_FS, 0x55555b297380) = 0 set_tid_address(0x55555b297650) = 5823 set_robust_list(0x55555b297660, 24) = 0 rseq(0x55555b297ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2151293142", 4096) = 28 getrandom("\x51\x1f\x5f\xe3\x15\xfa\xc5\x65", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555b297d00 brk(0x55555b2b8d00) = 0x55555b2b8d00 brk(0x55555b2b9000) = 0x55555b2b9000 mprotect(0x7f34da00b000, 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 unshare(CLONE_NEWPID) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55555b297650) = 5824 ./strace-static-x86_64: Process 5824 attached [pid 5824] set_robust_list(0x55555b297660, 24) = 0 [pid 5824] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5824] getppid() = 0 [pid 5824] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5824] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5824] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5824] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5824] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5824] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5824] unshare(CLONE_NEWNS) = 0 [pid 5824] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5824] unshare(CLONE_NEWIPC) = 0 [pid 5824] unshare(CLONE_NEWCGROUP) = 0 [pid 5824] unshare(CLONE_NEWUTS) = 0 [pid 5824] unshare(CLONE_SYSVSEM) = 0 [pid 5824] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5824] write(3, "16777216", 8) = 8 [pid 5824] close(3) = 0 [pid 5824] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5824] write(3, "536870912", 9) = 9 [pid 5824] close(3) = 0 [pid 5824] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5824] write(3, "1024", 4) = 4 [pid 5824] close(3) = 0 [pid 5824] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5824] write(3, "8192", 4) = 4 [pid 5824] close(3) = 0 [pid 5824] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5824] write(3, "1024", 4) = 4 [pid 5824] close(3) = 0 [pid 5824] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5824] write(3, "1024", 4) = 4 [pid 5824] close(3) = 0 [pid 5824] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5824] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5824] close(3) = 0 [pid 5824] getpid() = 1 [pid 5824] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<fi_sysfile_type]#5){+.+.}-{4:4}, at: __ocfs2_flush_truncate_log+0x33c/0x10e0 [ 90.390210][ T5824] [ 90.390210][ T5824] but task is already holding lock: [ 90.397550][ T5824] ffff8880758a5f40 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}, at: ocfs2_flush_truncate_log+0x47/0x70 [ 90.410273][ T5824] [ 90.410273][ T5824] which lock already depends on the new lock. [ 90.410273][ T5824] [ 90.420657][ T5824] [ 90.420657][ T5824] the existing dependency chain (in reverse order) is: [ 90.429649][ T5824] [ 90.429649][ T5824] -> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}: [ 90.440276][ T5824] lock_acquire+0x120/0x360 [ 90.445310][ T5824] down_write+0x96/0x1f0 [ 90.450073][ T5824] __ocfs2_move_extents_range+0x1a68/0x3370 [ 90.456474][ T5824] ocfs2_move_extents+0x378/0x960 [ 90.462002][ T5824] ocfs2_ioctl_move_extents+0x53e/0x710 [ 90.468054][ T5824] ocfs2_ioctl+0x191/0x750 [ 90.472978][ T5824] __se_sys_ioctl+0xfc/0x170 [ 90.478074][ T5824] do_syscall_64+0xf6/0x210 [ 90.483086][ T5824] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 90.489490][ T5824] [ 90.489490][ T5824] -> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}: [ 90.500019][ T5824] validate_chain+0xb9b/0x2140 [ 90.505298][ T5824] __lock_acquire+0xaac/0xd20 [ 90.510500][ T5824] lock_acquire+0x120/0x360 [ 90.515533][ T5824] down_write+0x96/0x1f0 [ 90.520381][ T5824] __ocfs2_flush_truncate_log+0x33c/0x10e0 [ 90.526709][ T5824] ocfs2_flush_truncate_log+0x4f/0x70 [ 90.532602][ T5824] ocfs2_sync_fs+0x116/0x310 [ 90.537703][ T5824] sync_filesystem+0x1cf/0x230 [ 90.542981][ T5824] generic_shutdown_super+0x6f/0x2c0 [ 90.548790][ T5824] kill_block_super+0x44/0x90 [ 90.553981][ T5824] deactivate_locked_super+0xbc/0x130 [ 90.559863][ T5824] cleanup_mnt+0x425/0x4c0 [ 90.564799][ T5824] task_work_run+0x1d4/0x260 [ 90.569906][ T5824] do_exit+0x8d6/0x2550 [ 90.574572][ T5824] do_group_exit+0x21c/0x2d0 [ 90.579672][ T5824] __x64_sys_exit_group+0x3f/0x40 [ 90.585242][ T5824] x64_sys_call+0x21ba/0x21c0 [ 90.590429][ T5824] do_syscall_64+0xf6/0x210 [ 90.595443][ T5824] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 90.601843][ T5824] [ 90.601843][ T5824] other info that might help us debug this: [ 90.601843][ T5824] [ 90.612053][ T5824] Possible unsafe locking scenario: [ 90.612053][ T5824] [ 90.619484][ T5824] CPU0 CPU1 [ 90.624828][ T5824] ---- ---- [ 90.630173][ T5824] lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6); [ 90.637459][ T5824] lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5); [ 90.647270][ T5824] lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6); [ 90.657079][ T5824] lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5); [ 90.664414][ T5824] [ 90.664414][ T5824] *** DEADLOCK *** [ 90.664414][ T5824] [ 90.672551][ T5824] 2 locks held by syz-executor215/5824: [ 90.678082][ T5824] #0: ffff88807a8920e0 (&type->s_umount_key#49){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 [ 90.688337][ T5824] #1: ffff8880758a5f40 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{4:4}, at: ocfs2_flush_truncate_log+0x47/0x70 [ 90.701516][ T5824] [ 90.701516][ T5824] stack backtrace: [ 90.707391][ T5824] CPU: 0 UID: 0 PID: 5824 Comm: syz-executor215 Not tainted 6.15.0-rc4-syzkaller-00052-g4f79eaa2ceac #0 PREEMPT(full) [ 90.707412][ T5824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 [ 90.707422][ T5824] Call Trace: [ 90.707431][ T5824] [ 90.707439][ T5824] dump_stack_lvl+0x189/0x250 [ 90.707469][ T5824] ? __pfx_dump_stack_lvl+0x10/0x10 [ 90.707494][ T5824] ? __pfx__printk+0x10/0x10 [ 90.707513][ T5824] ? print_lock_name+0xde/0x100 [ 90.707542][ T5824] print_circular_bug+0x2ee/0x310 [ 90.707562][ T5824] check_noncircular+0x134/0x160 [ 90.707581][ T5824] validate_chain+0xb9b/0x2140 [ 90.707598][ T5824] ? __mutex_unlock_slowpath+0x1cd/0x700 [ 90.707622][ T5824] ? __pfx___mutex_unlock_slowpath+0x10/0x10 [ 90.707644][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.707667][ T5824] __lock_acquire+0xaac/0xd20 [ 90.707693][ T5824] ? __ocfs2_flush_truncate_log+0x33c/0x10e0 [ 90.707718][ T5824] lock_acquire+0x120/0x360 [ 90.707741][ T5824] ? __ocfs2_flush_truncate_log+0x33c/0x10e0 [ 90.707768][ T5824] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 90.707785][ T5824] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 90.707804][ T5824] down_write+0x96/0x1f0 [ 90.707825][ T5824] ? __ocfs2_flush_truncate_log+0x33c/0x10e0 [ 90.707849][ T5824] ? __pfx_down_write+0x10/0x10 [ 90.707871][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.707890][ T5824] ? __wake_up_common_lock+0x190/0x1f0 [ 90.707915][ T5824] __ocfs2_flush_truncate_log+0x33c/0x10e0 [ 90.707943][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.707966][ T5824] ? __pfx___ocfs2_flush_truncate_log+0x10/0x10 [ 90.707991][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708013][ T5824] ? __lock_acquire+0xaac/0xd20 [ 90.708039][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708058][ T5824] ? down_write+0x162/0x1f0 [ 90.708079][ T5824] ? __pfx_down_write+0x10/0x10 [ 90.708101][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708122][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708144][ T5824] ocfs2_flush_truncate_log+0x4f/0x70 [ 90.708172][ T5824] ocfs2_sync_fs+0x116/0x310 [ 90.708192][ T5824] ? __pfx_ocfs2_sync_fs+0x10/0x10 [ 90.708210][ T5824] ? __pfx___writeback_inodes_sb_nr+0x10/0x10 [ 90.708237][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708257][ T5824] ? __dentry_kill+0x53d/0x660 [ 90.708280][ T5824] ? get_nr_dirty_inodes+0x1c4/0x210 [ 90.708303][ T5824] sync_filesystem+0x1cf/0x230 [ 90.708327][ T5824] generic_shutdown_super+0x6f/0x2c0 [ 90.708345][ T5824] kill_block_super+0x44/0x90 [ 90.708365][ T5824] deactivate_locked_super+0xbc/0x130 [ 90.708382][ T5824] cleanup_mnt+0x425/0x4c0 [ 90.708408][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708427][ T5824] ? lockdep_hardirqs_on+0x9c/0x150 [ 90.708447][ T5824] task_work_run+0x1d4/0x260 [ 90.708471][ T5824] ? __pfx_task_work_run+0x10/0x10 [ 90.708494][ T5824] ? do_exit+0x8d1/0x2550 [ 90.708514][ T5824] ? kmem_cache_free+0x1fb/0x3f0 [ 90.708538][ T5824] do_exit+0x8d6/0x2550 [ 90.708558][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708580][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708601][ T5824] ? __pfx_do_exit+0x10/0x10 [ 90.708624][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708645][ T5824] ? _raw_spin_unlock_irq+0x23/0x50 [ 90.708661][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708681][ T5824] ? lockdep_hardirqs_on+0x9c/0x150 [ 90.708700][ T5824] do_group_exit+0x21c/0x2d0 [ 90.708724][ T5824] __x64_sys_exit_group+0x3f/0x40 [ 90.708745][ T5824] x64_sys_call+0x21ba/0x21c0 [ 90.708762][ T5824] do_syscall_64+0xf6/0x210 [ 90.708782][ T5824] ? srso_alias_return_thunk+0x5/0xfbef5 [ 90.708802][ T5824] ? exc_page_fault+0x91/0x110 [ 90.708820][ T5824] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 90.708837][ T5824] RIP: 0033:0x7f34d9f90b89 [ 90.708851][ T5824] Code: Unable to access opcode bytes at 0x7f34d9f90b5f. [ 90.708860][ T5824] RSP: 002b:00007ffcdfe750f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 90.708878][ T5824] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f34d9f90b89 [ 90.708890][ T5824] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 90.708900][ T5824] RBP: 00007f34da0112d0 R08: ffffffffffffffb8 R09: 0000000000000006 [ 90.708912][ T5824] R10: 0000000000000006 R11: 0000000000000246 R12: 00007f34da0112d0 [ 90.708923][ T5824] R13: 0000000000000000 R14: 00007f34da012040 R15: 00007f34d9f5f0d0 [ 90.708941][ T5824] [pid 5824] +++ exited with 1 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5824, si_uid=0, si_status=1, si_utime=2 /* 0.02 s */, si_stime=34 /* 0.34 s */} --- exit_group(0) = ? +++ exited with 0 +++ [ 91.1