./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2022642565 <...> Warning: Permanently added '10.128.0.131' (ED25519) to the list of known hosts. execve("./syz-executor2022642565", ["./syz-executor2022642565"], 0x7ffdca21f330 /* 10 vars */) = 0 brk(NULL) = 0x55557a833000 brk(0x55557a833d00) = 0x55557a833d00 arch_prctl(ARCH_SET_FS, 0x55557a833380) = 0 set_tid_address(0x55557a833650) = 5849 set_robust_list(0x55557a833660, 24) = 0 rseq(0x55557a833ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2022642565", 4096) = 28 getrandom("\xb6\x53\xa6\x45\x14\x60\xe5\x7b", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557a833d00 brk(0x55557a854d00) = 0x55557a854d00 brk(0x55557a855000) = 0x55557a855000 mprotect(0x7f5afbf05000, 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, child_tidptr=0x55557a833650) = 5851 ./strace-static-x86_64: Process 5851 attached [pid 5851] set_robust_list(0x55557a833660, 24) = 0 [pid 5851] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5851] setpgid(0, 0) = 0 [pid 5851] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5851] write(3, "1000", 4) = 4 [pid 5851] close(3) = 0 executing program [pid 5851] write(1, "executing program\n", 18) = 18 [pid 5851] memfd_create("syzkaller", 0) = 3 [pid 5851] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f5af3a00000 [pid 5851] write(3, "\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\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"..., 16777216) = 16777216 [pid 5851] munmap(0x7f5af3a00000, 138412032) = 0 [pid 5851] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5851] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5851] close(3) = 0 [pid 5851] close(4) = 0 [pid 5851] mkdir("./file1", 0777) = 0 [ 234.200577][ T5851] loop0: detected capacity change from 0 to 32768 [pid 5851] mount("/dev/loop0", "./file1", "jfs", 0, "") = 0 [pid 5851] openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3 [pid 5851] chdir("./file1") = 0 [pid 5851] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5851] creat("./file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 000 [pid 5849] kill(-5851, SIGKILL) = 0 [pid 5849] kill(5851, SIGKILL) = 0 [pid 5849] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5849] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5849] getdents64(3, 0x55557a8346f0 /* 2 entries */, 32768) = 48 [pid 5849] getdents64(3, 0x55557a8346f0 /* 0 entries */, 32768) = 0 [pid 5849] close(3) = 0 [ 429.783469][ T31] INFO: task kworker/u8:1:13 blocked for more than 143 seconds. [ 429.791193][ T31] Not tainted 6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 [ 429.799339][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 429.808480][ T31] task:kworker/u8:1 state:D stack:21304 pid:13 tgid:13 ppid:2 task_flags:0x4208060 flags:0x00004000 [ 429.820709][ T31] Workqueue: writeback wb_workfn (flush-7:0) [ 429.826972][ T31] Call Trace: [ 429.830266][ T31] [ 429.833214][ T31] __schedule+0x168f/0x4c70 [ 429.838049][ T31] ? blk_mq_flush_plug_list+0x163a/0x1760 [ 429.843958][ T31] ? __pfx_blk_mq_flush_plug_list+0x10/0x10 [ 429.849866][ T31] ? schedule+0x165/0x360 [ 429.854427][ T31] ? __pfx___schedule+0x10/0x10 [ 429.859312][ T31] ? schedule+0x91/0x360 [ 429.865027][ T31] schedule+0x165/0x360 [ 429.869215][ T31] schedule_preempt_disabled+0x13/0x30 [ 429.874904][ T31] __mutex_lock+0x724/0xe80 [ 429.879430][ T31] ? __mutex_lock+0x51b/0xe80 [ 429.884320][ T31] ? jfs_commit_inode+0x1ca/0x530 [ 429.889370][ T31] ? __pfx___mutex_lock+0x10/0x10 [ 429.894608][ T31] ? inode_to_bdi+0x69/0xf0 [ 429.899164][ T31] jfs_commit_inode+0x1ca/0x530 [ 429.904238][ T31] ? __pfx_jfs_commit_inode+0x10/0x10 [ 429.909647][ T31] jfs_write_inode+0x145/0x220 [ 429.915179][ T31] __writeback_single_inode+0x6ee/0xff0 [ 429.920767][ T31] writeback_sb_inodes+0x6b5/0x1000 [ 429.926234][ T31] ? __pfx_writeback_sb_inodes+0x10/0x10 [ 429.931928][ T31] ? __pfx___up_read+0x10/0x10 [ 429.936918][ T31] __writeback_inodes_wb+0x111/0x240 [ 429.942231][ T31] wb_writeback+0x44f/0xaf0 [ 429.946954][ T31] ? queue_io+0x3a1/0x590 [ 429.951304][ T31] ? __pfx_wb_writeback+0x10/0x10 [ 429.956554][ T31] wb_workfn+0xaef/0xef0 [ 429.960833][ T31] ? __pfx_wb_workfn+0x10/0x10 [ 429.965809][ T31] ? register_lock_class+0x51/0x320 [ 429.971039][ T31] ? __lock_acquire+0xaac/0xd20 [ 429.976115][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.981911][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 429.987400][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.993157][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 429.999244][ T31] process_scheduled_works+0xadb/0x17a0 [ 430.005019][ T31] ? __pfx_process_scheduled_works+0x10/0x10 [ 430.011048][ T31] worker_thread+0x8a0/0xda0 [ 430.016032][ T31] kthread+0x70e/0x8a0 [ 430.020148][ T31] ? __pfx_worker_thread+0x10/0x10 [ 430.026351][ T31] ? __pfx_kthread+0x10/0x10 [ 430.031000][ T31] ? __pfx_kthread+0x10/0x10 [ 430.036025][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.041254][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.046832][ T31] ? __pfx_kthread+0x10/0x10 [ 430.051445][ T31] ret_from_fork+0x4b/0x80 [ 430.056214][ T31] ? __pfx_kthread+0x10/0x10 [ 430.060822][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.065934][ T31] [ 430.069112][ T31] [ 430.069112][ T31] Showing all locks held in the system: [ 430.077338][ T31] 4 locks held by kworker/u8:1/13: [ 430.082457][ T31] #0: ffff888140edc948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 [ 430.094171][ T31] #1: ffffc90000127c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 [ 430.106863][ T31] #2: ffff88802d53a0e0 (&type->s_umount_key#43){.+.+}-{4:4}, at: super_trylock_shared+0x20/0xf0 [ 430.117733][ T31] #3: ffff888074432fe0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 [ 430.128269][ T31] 1 lock held by khungtaskd/31: [ 430.133124][ T31] #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 430.143675][ T31] 2 locks held by getty/5582: [ 430.148363][ T31] #0: ffff88814e2280a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 430.158508][ T31] #1: ffffc900036bc2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 430.168876][ T31] 4 locks held by syz-executor202/5851: [ 430.174710][ T31] [ 430.177040][ T31] ============================================= [ 430.177040][ T31] [ 430.185948][ T31] NMI backtrace for cpu 1 [ 430.185969][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 PREEMPT(full) [ 430.185992][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 430.186004][ T31] Call Trace: [ 430.186011][ T31] [ 430.186018][ T31] dump_stack_lvl+0x189/0x250 [ 430.186045][ T31] ? __wake_up_klogd+0xd9/0x110 [ 430.186075][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.186101][ T31] ? __pfx__printk+0x10/0x10 [ 430.186144][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 430.186168][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 430.186185][ T31] ? _printk+0xcf/0x120 [ 430.186218][ T31] ? __pfx__printk+0x10/0x10 [ 430.186250][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 430.186271][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 430.186295][ T31] watchdog+0xfee/0x1030 [ 430.186321][ T31] ? watchdog+0x1de/0x1030 [ 430.186352][ T31] kthread+0x70e/0x8a0 [ 430.186377][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.186399][ T31] ? __pfx_kthread+0x10/0x10 [ 430.186422][ T31] ? __pfx_kthread+0x10/0x10 [ 430.186443][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.186465][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.186489][ T31] ? __pfx_kthread+0x10/0x10 [ 430.186510][ T31] ret_from_fork+0x4b/0x80 [ 430.186528][ T31] ? __pfx_kthread+0x10/0x10 [ 430.186549][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.186593][ T31] [ 430.186600][ T31] Sending NMI from CPU 1 to CPUs 0: [ 430.332904][ C0] NMI backtrace for cpu 0 [ 430.332921][ C0] CPU: 0 UID: 0 PID: 5851 Comm: syz-executor202 Not tainted 6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 PREEMPT(full) [ 430.332942][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 430.332953][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 [ 430.332977][ C0] Code: 08 a0 72 92 65 8b 15 18 af b2 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 <83> fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c [ 430.332992][ C0] RSP: 0018:ffffc900044ef2c0 EFLAGS: 00000246 [ 430.333007][ C0] RAX: ffffffff8339286f RBX: 0000000000000004 RCX: ffff888032598000 [ 430.333020][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000ff [ 430.333031][ C0] RBP: 0000000000000000 R08: 00000000000001ff R09: 0000000000000000 [ 430.333041][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 430.333052][ C0] R13: ffff8880288c6000 R14: 0000000000000000 R15: 1ffff11005118c02 [ 430.333064][ C0] FS: 000055557a833380(0000) GS:ffff8881260f6000(0000) knlGS:0000000000000000 [ 430.333079][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 430.333091][ C0] CR2: 0000559fb9ce7168 CR3: 00000000301d0000 CR4: 00000000003526f0 [ 430.333105][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 430.333115][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 430.333125][ C0] Call Trace: [ 430.333133][ C0] [ 430.333140][ C0] dtSplitRoot+0x77f/0x16c0 [ 430.333181][ C0] dtInsert+0xef8/0x5f40 [ 430.333211][ C0] ? txLockAlloc+0x239/0x380 [ 430.333229][ C0] ? __pfx_txLockAlloc+0x10/0x10 [ 430.333251][ C0] ? do_raw_spin_unlock+0x122/0x240 [ 430.333271][ C0] ? __pfx_dtInsert+0x10/0x10 [ 430.333293][ C0] ? txLock+0xfe0/0x1cb0 [ 430.333313][ C0] ? __pfx_txLock+0x10/0x10 [ 430.333340][ C0] jfs_create+0x6c8/0xa80 [ 430.333368][ C0] ? __pfx_jfs_create+0x10/0x10 [ 430.333389][ C0] ? __pfx_jfs_lookup+0x10/0x10 [ 430.333424][ C0] ? generic_permission+0x2e5/0x690 [ 430.333447][ C0] ? bpf_lsm_inode_create+0x9/0x20 [ 430.333464][ C0] ? __pfx_jfs_create+0x10/0x10 [ 430.333487][ C0] path_openat+0x14f1/0x3830 [ 430.333525][ C0] ? __pfx_path_openat+0x10/0x10 [ 430.333545][ C0] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 430.333572][ C0] do_filp_open+0x1fa/0x410 [ 430.333594][ C0] ? __pfx_do_filp_open+0x10/0x10 [ 430.333624][ C0] ? _raw_spin_unlock+0x28/0x50 [ 430.333642][ C0] ? alloc_fd+0x64c/0x6c0 [ 430.333672][ C0] do_sys_openat2+0x121/0x1c0 [ 430.333691][ C0] ? __pfx_ptrace_notify+0x10/0x10 [ 430.333715][ C0] ? __pfx_do_sys_openat2+0x10/0x10 [ 430.333740][ C0] __x64_sys_creat+0x8f/0xc0 [ 430.333761][ C0] do_syscall_64+0xf6/0x210 [ 430.333784][ C0] ? clear_bhb_loop+0x60/0xb0 [ 430.333803][ C0] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 430.333844][ C0] RIP: 0033:0x7f5afbe8ba99 [ 430.333869][ C0] 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 [ 430.333883][ C0] RSP: 002b:00007fff11b995b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 430.333899][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5afbe8ba99 [ 430.333911][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000f40 [ 430.333922][ C0] RBP: 00007f5afbf055f0 R08: 00000000000061c0 R09: 000055557a8344c0 [ 430.333934][ C0] R10: 00007fff11b99480 R11: 0000000000000246 R12: 00007fff11b995e0 [ 430.333946][ C0] R13: 00007fff11b99808 R14: 431bde82d7b634db R15: 00007f5afbed403b [ 430.333966][ C0] [ 430.333974][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.070 msecs [ 430.334916][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 430.334931][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 PREEMPT(full) [ 430.334953][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 430.334965][ T31] Call Trace: [ 430.334972][ T31] [ 430.334980][ T31] dump_stack_lvl+0x99/0x250 [ 430.335008][ T31] ? __asan_memcpy+0x40/0x70 [ 430.335032][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 430.335057][ T31] ? __pfx__printk+0x10/0x10 [ 430.335110][ T31] panic+0x2db/0x790 [ 430.335139][ T31] ? __pfx_panic+0x10/0x10 [ 430.335160][ T31] ? tick_nohz_tick_stopped+0x86/0xb0 [ 430.335194][ T31] ? preempt_schedule_thunk+0x16/0x30 [ 430.335215][ T31] ? nmi_trigger_cpumask_backtrace+0x2b6/0x300 [ 430.335242][ T31] watchdog+0x102d/0x1030 [ 430.335267][ T31] ? watchdog+0x1de/0x1030 [ 430.335296][ T31] kthread+0x70e/0x8a0 [ 430.335321][ T31] ? __pfx_watchdog+0x10/0x10 [ 430.335343][ T31] ? __pfx_kthread+0x10/0x10 [ 430.335365][ T31] ? __pfx_kthread+0x10/0x10 [ 430.335385][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 430.335406][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 430.335429][ T31] ? __pfx_kthread+0x10/0x10 [ 430.335449][ T31] ret_from_fork+0x4b/0x80 [ 430.335467][ T31] ? __pfx_kthread+0x10/0x10 [ 430.335488][ T31] ret_from_fork_asm+0x1a/0x30 [ 430.335529][ T31] [ 430.833226][ T31] Kernel Offset: disabled [ 430.837548][ T31] Rebooting in 86400 seconds..