./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor494906779 <...> Warning: Permanently added '10.128.1.84' (ED25519) to the list of known hosts. execve("./syz-executor494906779", ["./syz-executor494906779"], 0x7ffe42b895a0 /* 10 vars */) = 0 brk(NULL) = 0x5555936d3000 brk(0x5555936d3d00) = 0x5555936d3d00 arch_prctl(ARCH_SET_FS, 0x5555936d3380) = 0 set_tid_address(0x5555936d3650) = 5832 set_robust_list(0x5555936d3660, 24) = 0 rseq(0x5555936d3ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor494906779", 4096) = 27 getrandom("\xd9\x94\x3e\x74\x87\x21\xf1\xc3", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555936d3d00 brk(0x5555936f4d00) = 0x5555936f4d00 brk(0x5555936f5000) = 0x5555936f5000 mprotect(0x7f3a35437000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 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./strace-static-x86_64: Process 5833 attached [pid 5833] set_robust_list(0x5555936d3660, 24) = 0 [pid 5832] <... clone resumed>, child_tidptr=0x5555936d3650) = 5833 [pid 5833] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5833] setpgid(0, 0) = 0 [pid 5833] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5833] write(3, "1000", 4) = 4 [pid 5833] close(3) = 0 [pid 5833] write(1, "executing program\n", 18executing program ) = 18 [pid 5833] memfd_create("syzkaller", 0) = 3 [pid 5833] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f3a2ce00000 [pid 5833] write(3, "\xeb\x76\x90\x45\x58\x46\x41\x54\x20\x20\x20\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\x01\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x08\x00\x00\x00\x88\x00\x00\x00\x0f\x00\x00\x00\x05\x00\x00\x00"..., 131072) = 131072 [pid 5833] munmap(0x7f3a2ce00000, 138412032) = 0 [pid 5833] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5833] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5833] close(3) = 0 [pid 5833] close(4) = 0 [pid 5833] mkdir("./bus", 0777) = 0 [pid 5833] mount("/dev/loop0", "./bus", "exfat", MS_SILENT, "") = 0 [pid 5833] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 3 [pid 5833] chdir("./bus") = 0 [pid 5833] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5833] mkdir("./file0", 000) = 0 [pid 5833] truncate("./file1", 61440) = 0 [ 105.721590][ T5833] loop0: detected capacity change from 0 to 256 [ 105.758709][ T5833] exFAT-fs (loop0): failed to load upcase table (idx : 0x000104d0, chksum : 0x60d18cac, utbl_chksum : 0xe619d30d) [pid 5833] unlink("./file1" [pid 5832] kill(-5833, SIGKILL) = 0 [pid 5832] kill(5833, SIGKILL) = 0 [pid 5832] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5832] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5832] getdents64(3, 0x5555936d46f0 /* 2 entries */, 32768) = 48 [pid 5832] getdents64(3, 0x5555936d46f0 /* 0 entries */, 32768) = 0 [pid 5832] close(3) = 0 [ 286.565369][ T30] INFO: task kworker/u8:8:3469 blocked for more than 143 seconds. [ 286.573871][ T30] Not tainted 6.13.0-rc1-syzkaller-00005-gceb8bf2ceaa7 #0 [ 286.582223][ T30] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.591948][ T30] task:kworker/u8:8 state:D stack:20720 pid:3469 tgid:3469 ppid:2 flags:0x00004000 [ 286.602821][ T30] Workqueue: writeback wb_workfn (flush-7:0) [ 286.609283][ T30] Call Trace: [ 286.612905][ T30] [ 286.615972][ T30] __schedule+0x17fb/0x4be0 [ 286.620596][ T30] ? __pfx___schedule+0x10/0x10 [ 286.626892][ T30] ? __blk_flush_plug+0x449/0x500 [ 286.633348][ T30] ? __pfx_lock_release+0x10/0x10 [ 286.638542][ T30] ? kthread_data+0x52/0xd0 [ 286.643511][ T30] ? schedule+0x90/0x320 [ 286.648367][ T30] ? wq_worker_sleeping+0x66/0x240 [ 286.654141][ T30] ? schedule+0x90/0x320 [ 286.658711][ T30] schedule+0x14b/0x320 [ 286.663671][ T30] schedule_preempt_disabled+0x13/0x30 [ 286.669237][ T30] __mutex_lock+0x7e7/0xee0 [ 286.675145][ T30] ? __mutex_lock+0x5ef/0xee0 [ 286.680067][ T30] ? exfat_write_inode+0xe5/0x1a0 [ 286.685709][ T30] ? __pfx___mutex_lock+0x10/0x10 [ 286.691582][ T30] ? __writeback_single_inode+0x48f/0x10d0 [ 286.698564][ T30] ? do_raw_spin_unlock+0x13c/0x8b0 [ 286.705947][ T30] exfat_write_inode+0xe5/0x1a0 [ 286.711593][ T30] __writeback_single_inode+0x708/0x10d0 [ 286.718032][ T30] writeback_sb_inodes+0x820/0x1360 [ 286.724496][ T30] ? mark_lock+0x2ae/0x360 [ 286.729886][ T30] ? __pfx_writeback_sb_inodes+0x10/0x10 [ 286.736822][ T30] ? __pfx___up_read+0x10/0x10 [ 286.742121][ T30] ? do_raw_spin_lock+0x14f/0x370 [ 286.747898][ T30] __writeback_inodes_wb+0x11b/0x260 [ 286.753836][ T30] wb_writeback+0x427/0xb80 [ 286.759051][ T30] ? queue_io+0x321/0x5a0 [ 286.764067][ T30] ? __pfx_wb_writeback+0x10/0x10 [ 286.769246][ T30] wb_workfn+0xc4b/0x1080 [ 286.774506][ T30] ? __pfx_wb_workfn+0x10/0x10 [ 286.779556][ T30] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 286.786463][ T30] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 286.793384][ T30] ? process_scheduled_works+0x976/0x1840 [ 286.799169][ T30] process_scheduled_works+0xa66/0x1840 [ 286.805485][ T30] ? __pfx_process_scheduled_works+0x10/0x10 [ 286.811753][ T30] ? assign_work+0x364/0x3d0 [ 286.817506][ T30] worker_thread+0x870/0xd30 [ 286.822346][ T30] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 286.829314][ T30] ? __kthread_parkme+0x169/0x1d0 [ 286.834632][ T30] ? __pfx_worker_thread+0x10/0x10 [ 286.840556][ T30] kthread+0x2f0/0x390 [ 286.845537][ T30] ? __pfx_worker_thread+0x10/0x10 [ 286.851130][ T30] ? __pfx_kthread+0x10/0x10 [ 286.856718][ T30] ret_from_fork+0x4b/0x80 [ 286.861306][ T30] ? __pfx_kthread+0x10/0x10 [ 286.867214][ T30] ret_from_fork_asm+0x1a/0x30 [ 286.873276][ T30] [ 286.877012][ T30] [ 286.877012][ T30] Showing all locks held in the system: [ 286.885604][ T30] 1 lock held by khungtaskd/30: [ 286.890666][ T30] #0: ffffffff8e937aa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 [ 286.901275][ T30] 4 locks held by kworker/u8:8/3469: [ 286.907033][ T30] #0: ffff8880202cb148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 [ 286.920209][ T30] #1: ffffc9000d367d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 [ 286.934773][ T30] #2: ffff8880363420e0 (&type->s_umount_key#43){.+.+}-{4:4}, at: super_trylock_shared+0x22/0xf0 [ 286.947564][ T30] #3: ffff8880363400e8 (&sbi->s_lock){+.+.}-{4:4}, at: exfat_write_inode+0xe5/0x1a0 [ 286.957911][ T30] 2 locks held by getty/5573: [ 286.963951][ T30] #0: ffff88814d7390a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 286.975298][ T30] #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 [ 286.987620][ T30] 3 locks held by syz-executor494/5833: [ 286.993960][ T30] [ 286.996327][ T30] ============================================= [ 286.996327][ T30] [ 287.005832][ T30] NMI backtrace for cpu 0 [ 287.010580][ T30] CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc1-syzkaller-00005-gceb8bf2ceaa7 #0 [ 287.021378][ T30] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 287.031953][ T30] Call Trace: [ 287.035335][ T30] [ 287.038413][ T30] dump_stack_lvl+0x241/0x360 [ 287.043509][ T30] ? __pfx_dump_stack_lvl+0x10/0x10 [ 287.049572][ T30] ? __pfx__printk+0x10/0x10 [ 287.054328][ T30] nmi_cpu_backtrace+0x49c/0x4d0 [ 287.059391][ T30] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 287.064902][ T30] ? _printk+0xd5/0x120 [ 287.069381][ T30] ? __pfx__printk+0x10/0x10 [ 287.074036][ T30] ? __wake_up_klogd+0xcc/0x110 [ 287.079034][ T30] ? __pfx__printk+0x10/0x10 [ 287.084008][ T30] ? __rcu_read_unlock+0xa1/0x110 [ 287.089199][ T30] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 287.095231][ T30] nmi_trigger_cpumask_backtrace+0x198/0x320 [ 287.101330][ T30] watchdog+0xff6/0x1040 [ 287.105629][ T30] ? watchdog+0x1ea/0x1040 [ 287.110147][ T30] ? __pfx_watchdog+0x10/0x10 [ 287.114848][ T30] kthread+0x2f0/0x390 [ 287.119101][ T30] ? __pfx_watchdog+0x10/0x10 [ 287.124864][ T30] ? __pfx_kthread+0x10/0x10 [ 287.130229][ T30] ret_from_fork+0x4b/0x80 [ 287.134960][ T30] ? __pfx_kthread+0x10/0x10 [ 287.139855][ T30] ret_from_fork_asm+0x1a/0x30 [ 287.145700][ T30] [ 287.149349][ T30] Sending NMI from CPU 0 to CPUs 1: [ 287.155158][ C1] NMI backtrace for cpu 1 [ 287.155179][ C1] CPU: 1 UID: 0 PID: 5833 Comm: syz-executor494 Not tainted 6.13.0-rc1-syzkaller-00005-gceb8bf2ceaa7 #0 [ 287.155198][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 287.155207][ C1] RIP: 0010:lockdep_hardirqs_off+0x3e/0x110 [ 287.155233][ C1] Code: 48 89 44 24 08 83 3d 40 7e 50 04 00 0f 84 8e 00 00 00 49 89 fe 65 8b 05 b8 04 3c 74 a9 00 00 f0 00 74 66 83 3d e2 c9 70 0e 00 <75> 15 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 [ 287.155245][ C1] RSP: 0018:ffffc90003ab7728 EFLAGS: 00000046 [ 287.155260][ C1] RAX: 0000000000000000 RBX: ffffffff822bf8b0 RCX: ffff888036318000 [ 287.155271][ C1] RDX: 0000000000000000 RSI: ffffffff8c0a96a0 RDI: ffffffff8c5e90a0 [ 287.155282][ C1] RBP: ffffc90003ab7898 R08: ffffffff822bf899 R09: 1ffff1100c6f5d79 [ 287.155294][ C1] R10: dffffc0000000000 R11: ffffed100c6f5d7a R12: 0000000000000246 [ 287.155305][ C1] R13: dffffc0000000000 R14: ffffffff822bf8b0 R15: 0000000000000080 [ 287.155316][ C1] FS: 00005555936d3380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 [ 287.155330][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 287.155341][ C1] CR2: 00005604c4d1c600 CR3: 000000003554a000 CR4: 00000000003526f0 [ 287.155355][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 287.155364][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 287.155374][ C1] Call Trace: [ 287.155381][ C1] [ 287.155389][ C1] ? nmi_cpu_backtrace+0x3c2/0x4d0 [ 287.155406][ C1] ? __pfx_lock_acquire+0x10/0x10 [ 287.155424][ C1] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 287.155440][ C1] ? nmi_handle+0x2a/0x5a0 [ 287.155464][ C1] ? nmi_cpu_backtrace_handler+0xc/0x20 [ 287.155483][ C1] ? nmi_handle+0x14f/0x5a0 [ 287.155499][ C1] ? nmi_handle+0x2a/0x5a0 [ 287.155515][ C1] ? lockdep_hardirqs_off+0x3e/0x110 [ 287.155532][ C1] ? default_do_nmi+0x63/0x160 [ 287.155548][ C1] ? exc_nmi+0x123/0x1f0 [ 287.155563][ C1] ? end_repeat_nmi+0xf/0x53 [ 287.155583][ C1] ? __find_get_block+0x190/0x1150 [ 287.155599][ C1] ? __find_get_block+0x190/0x1150 [ 287.155613][ C1] ? __find_get_block+0x179/0x1150 [ 287.155629][ C1] ? lockdep_hardirqs_off+0x3e/0x110 [ 287.155647][ C1] ? lockdep_hardirqs_off+0x3e/0x110 [ 287.155666][ C1] ? lockdep_hardirqs_off+0x3e/0x110 [ 287.155684][ C1] [ 287.155689][ C1] [ 287.155695][ C1] ? __find_get_block+0x190/0x1150 [ 287.155716][ C1] trace_hardirqs_off+0x12/0x40 [ 287.155731][ C1] __find_get_block+0x190/0x1150 [ 287.155748][ C1] ? __pfx___find_get_block+0x10/0x10 [ 287.155763][ C1] ? __pfx___might_resched+0x10/0x10 [ 287.155787][ C1] ? bdev_getblk+0x53/0x550 [ 287.155802][ C1] ? fs_reclaim_acquire+0x93/0x130 [ 287.155823][ C1] bdev_getblk+0x33/0x550 [ 287.155837][ C1] ? mark_buffer_dirty+0x12/0x500 [ 287.155857][ C1] __bread_gfp+0x86/0x400 [ 287.155873][ C1] exfat_ent_get+0x14d/0x400 [ 287.155895][ C1] __exfat_free_cluster+0x56f/0x990 [ 287.155919][ C1] ? __pfx___exfat_free_cluster+0x10/0x10 [ 287.155940][ C1] ? do_raw_spin_unlock+0x13c/0x8b0 [ 287.155961][ C1] exfat_free_cluster+0x77/0xd0 [ 287.155980][ C1] __exfat_truncate+0x745/0xa60 [ 287.156003][ C1] ? __pfx___exfat_truncate+0x10/0x10 [ 287.156025][ C1] ? do_raw_spin_unlock+0x13c/0x8b0 [ 287.156045][ C1] exfat_evict_inode+0xd8/0x270 [ 287.156059][ C1] ? __pfx_exfat_evict_inode+0x10/0x10 [ 287.156075][ C1] evict+0x4e8/0x9a0 [ 287.156098][ C1] ? __pfx_evict+0x10/0x10 [ 287.156119][ C1] ? iput+0x713/0xa50 [ 287.156137][ C1] do_unlinkat+0x512/0x830 [ 287.156155][ C1] ? __pfx_do_unlinkat+0x10/0x10 [ 287.156169][ C1] ? __might_fault+0xc6/0x120 [ 287.156188][ C1] ? strncpy_from_user+0x152/0x270 [ 287.156282][ C1] ? getname_flags+0x1e3/0x540 [ 287.156301][ C1] __x64_sys_unlink+0x47/0x50 [ 287.156314][ C1] do_syscall_64+0xf3/0x230 [ 287.156334][ C1] ? clear_bhb_loop+0x35/0x90 [ 287.156354][ C1] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 287.156373][ C1] RIP: 0033:0x7f3a353c2ad9 [ 287.156393][ C1] 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 [ 287.156404][ C1] RSP: 002b:00007ffc504bf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 [ 287.156420][ C1] RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007f3a353c2ad9 [ 287.156431][ C1] RDX: 00007f3a353c2ad9 RSI: 00007f3a353c2ad9 RDI: 0000000020000180 [ 287.156442][ C1] RBP: 00007f3a354375f0 R08: 00005555936d44c0 R09: 00005555936d44c0 [ 287.156453][ C1] R10: 00005555936d44c0 R11: 0000000000000246 R12: 00007ffc504bf1b0 [ 287.156464][ C1] R13: 00007ffc504bf3d8 R14: 431bde82d7b634db R15: 00007f3a3540b03b [ 287.156482][ C1] [ 287.156489][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.331 msecs [ 287.667689][ T30] Kernel panic - not syncing: hung_task: blocked tasks [ 287.675545][ T30] CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc1-syzkaller-00005-gceb8bf2ceaa7 #0 [ 287.687204][ T30] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 287.698090][ T30] Call Trace: [ 287.701410][ T30] [ 287.704498][ T30] dump_stack_lvl+0x241/0x360 [ 287.710160][ T30] ? __pfx_dump_stack_lvl+0x10/0x10 [ 287.716133][ T30] ? __pfx__printk+0x10/0x10 [ 287.721231][ T30] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 287.727960][ T30] ? vscnprintf+0x5d/0x90 [ 287.732629][ T30] panic+0x349/0x880 [ 287.736643][ T30] ? nmi_trigger_cpumask_backtrace+0x244/0x320 [ 287.743263][ T30] ? __pfx_panic+0x10/0x10 [ 287.747758][ T30] ? tick_nohz_tick_stopped+0x82/0xb0 [ 287.753237][ T30] ? __irq_work_queue_local+0x137/0x410 [ 287.758819][ T30] ? preempt_schedule_thunk+0x1a/0x30 [ 287.764259][ T30] ? nmi_trigger_cpumask_backtrace+0x244/0x320 [ 287.770549][ T30] ? nmi_trigger_cpumask_backtrace+0x2d4/0x320 [ 287.776875][ T30] ? nmi_trigger_cpumask_backtrace+0x2d9/0x320 [ 287.783078][ T30] watchdog+0x1035/0x1040 [ 287.787490][ T30] ? watchdog+0x1ea/0x1040 [ 287.791940][ T30] ? __pfx_watchdog+0x10/0x10 [ 287.796922][ T30] kthread+0x2f0/0x390 [ 287.801111][ T30] ? __pfx_watchdog+0x10/0x10 [ 287.806005][ T30] ? __pfx_kthread+0x10/0x10 [ 287.810728][ T30] ret_from_fork+0x4b/0x80 [ 287.815613][ T30] ? __pfx_kthread+0x10/0x10 [ 287.820242][ T30] ret_from_fork_asm+0x1a/0x30 [ 287.825245][ T30] [ 287.828530][ T30] Kernel Offset: disabled [ 287.832895][ T30] Rebooting in 86400 seconds..