./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor7629901 <...> Warning: Permanently added '10.128.1.4' (ED25519) to the list of known hosts. execve("./syz-executor7629901", ["./syz-executor7629901"], 0x7ffec626f4f0 /* 10 vars */) = 0 brk(NULL) = 0x555556166000 brk(0x555556166d00) = 0x555556166d00 arch_prctl(ARCH_SET_FS, 0x555556166380) = 0 set_tid_address(0x555556166650) = 5839 set_robust_list(0x555556166660, 24) = 0 rseq(0x555556166ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor7629901", 4096) = 25 getrandom("\x78\xc7\xb1\x6b\x24\x3e\x2a\x77", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555556166d00 brk(0x555556187d00) = 0x555556187d00 brk(0x555556188000) = 0x555556188000 mprotect(0x7f2e979e3000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555556166650) = 5841 ./strace-static-x86_64: Process 5841 attached [pid 5841] set_robust_list(0x555556166660, 24) = 0 [pid 5841] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5841] setpgid(0, 0) = 0 [pid 5841] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5841] write(3, "1000", 4) = 4 [pid 5841] close(3) = 0 [pid 5841] write(1, "executing program\n", 18executing program ) = 18 [pid 5841] creat("./file0", 000) = 3 [pid 5841] pipe2([4, 5], 0) = 0 [pid 5841] write(5, "\x15\x00\x00\x00\x65\xff\xff\x04\x80\x00\x00\x08\x00\x39\x50\x32\x30\x30\x30\x00\x00", 21) = 21 [pid 5841] dup(5) = 6 [pid 5841] write(6, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 24) = 24 [pid 5841] write(6, "\x4c\x01\x00\x00\x05\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\x18\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"..., 311) = 311 [pid 5841] mount(NULL, "./file0", "9p", 0, "trans=fd,rfdno=0x0000000000000004,wfdno=0x0000000000000006,cache=mmap,k") = 0 [pid 5841] chmod("./file0", 000) = 0 [pid 5841] creat("./file0", 000) = 7 [pid 5841] pwritev2(7, [{iov_base="\x6c\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"..., iov_len=65007}], 1, 128, RWF_HIPRI|RWF_DSYNC|RWF_SYNC|RWF_APPEND [pid 5839] kill(-5841, SIGKILL) = 0 [pid 5839] kill(5841, SIGKILL) = 0 [pid 5839] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5839] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5839] getdents64(3, 0x5555561676f0 /* 2 entries */, 32768) = 48 [pid 5839] getdents64(3, 0x5555561676f0 /* 0 entries */, 32768) = 0 [pid 5839] close(3) = 0 [ 286.409348][ T31] INFO: task kworker/u8:5:71 blocked for more than 143 seconds. [ 286.417123][ T31] Not tainted 6.15.0-rc6-syzkaller-00051-g405e6c37c89e #0 [ 286.424835][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.433592][ T31] task:kworker/u8:5 state:D stack:24520 pid:71 tgid:71 ppid:2 task_flags:0x4208060 flags:0x00004000 [ 286.445759][ T31] Workqueue: events_unbound netfs_write_collection_worker [ 286.453107][ T31] Call Trace: [ 286.456572][ T31] [ 286.459642][ T31] __schedule+0x168f/0x4c70 [ 286.464212][ T31] ? __lock_acquire+0xaac/0xd20 [ 286.469179][ T31] ? schedule+0x165/0x360 [ 286.473551][ T31] ? __lock_acquire+0xaac/0xd20 [ 286.478410][ T31] ? __pfx___schedule+0x10/0x10 [ 286.483331][ T31] ? schedule+0x91/0x360 [ 286.487599][ T31] schedule+0x165/0x360 [ 286.491843][ T31] bit_wait+0x11/0xd0 [ 286.495869][ T31] __wait_on_bit+0xb9/0x310 [ 286.500866][ T31] ? __pfx_bit_wait+0x10/0x10 [ 286.505575][ T31] ? __pfx_bit_wait+0x10/0x10 [ 286.510400][ T31] out_of_line_wait_on_bit+0x123/0x170 [ 286.515893][ T31] ? __pfx_out_of_line_wait_on_bit+0x10/0x10 [ 286.521936][ T31] ? __pfx_wake_bit_function+0x10/0x10 [ 286.527424][ T31] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 286.533657][ T31] ? arch_stack_walk+0x11c/0x150 [ 286.538635][ T31] netfs_retry_writes+0x156/0x1840 [ 286.543815][ T31] ? ret_from_fork_asm+0x1a/0x30 [ 286.548795][ T31] ? stack_trace_save+0x9c/0xe0 [ 286.553737][ T31] ? __pfx_stack_trace_save+0x10/0x10 [ 286.559186][ T31] ? check_path+0x21/0x40 [ 286.563559][ T31] ? __pfx_netfs_retry_writes+0x10/0x10 [ 286.569253][ T31] ? lockdep_unlock+0x89/0x120 [ 286.574056][ T31] ? validate_chain+0x897/0x2140 [ 286.579046][ T31] netfs_write_collection_worker+0x2007/0x2bd0 [ 286.585329][ T31] ? process_scheduled_works+0x9ec/0x17a0 [ 286.591129][ T31] process_scheduled_works+0xadb/0x17a0 [ 286.596741][ T31] ? __pfx_process_scheduled_works+0x10/0x10 [ 286.602811][ T31] worker_thread+0x8a0/0xda0 [ 286.607422][ T31] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 286.613818][ T31] ? __kthread_parkme+0x7b/0x200 [ 286.618783][ T31] kthread+0x70e/0x8a0 [ 286.622911][ T31] ? __pfx_worker_thread+0x10/0x10 [ 286.628038][ T31] ? __pfx_kthread+0x10/0x10 [ 286.632722][ T31] ? __pfx_kthread+0x10/0x10 [ 286.637340][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 286.642598][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 286.647837][ T31] ? __pfx_kthread+0x10/0x10 [ 286.652528][ T31] ret_from_fork+0x4b/0x80 [ 286.656969][ T31] ? __pfx_kthread+0x10/0x10 [ 286.661620][ T31] ret_from_fork_asm+0x1a/0x30 [ 286.666454][ T31] [ 286.671692][ T31] [ 286.671692][ T31] Showing all locks held in the system: [ 286.679503][ T31] 1 lock held by khungtaskd/31: [ 286.684362][ T31] #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 286.694382][ T31] 2 locks held by kworker/u8:5/71: [ 286.699564][ T31] #0: ffff88801a089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 [ 286.711395][ T31] #1: ffffc900015c7c60 ((work_completion)(&rreq->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 [ 286.723329][ T31] 2 locks held by getty/5580: [ 286.728021][ T31] #0: ffff88803083f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 286.737865][ T31] #1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 286.748088][ T31] 3 locks held by syz-executor762/5841: [ 286.753693][ T31] #0: ffff88807b8b2420 (sb_writers#8){.+.+}-{0:0}, at: vfs_writev+0x274/0x9a0 [ 286.762759][ T31] #1: ffff88807a790148 (&sb->s_type->i_mutex_key#14){++++}-{4:4}, at: netfs_start_io_write+0xd8/0x100 [ 286.773888][ T31] #2: ffff88807a790500 (&ctx->wb_lock){+.+.}-{4:4}, at: netfs_begin_writethrough+0x65/0x140 [ 286.784251][ T31] [ 286.786579][ T31] ============================================= [ 286.786579][ T31] [ 286.795049][ T31] NMI backtrace for cpu 0 [ 286.795072][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00051-g405e6c37c89e #0 PREEMPT(full) [ 286.795097][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 286.795110][ T31] Call Trace: [ 286.795120][ T31] [ 286.795130][ T31] dump_stack_lvl+0x189/0x250 [ 286.795160][ T31] ? __wake_up_klogd+0xd9/0x110 [ 286.795184][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 286.795211][ T31] ? __pfx__printk+0x10/0x10 [ 286.795255][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 286.795279][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 286.795297][ T31] ? _printk+0xcf/0x120 [ 286.795332][ T31] ? __pfx__printk+0x10/0x10 [ 286.795367][ T31] ? debug_show_all_locks+0x2e/0x180 [ 286.795396][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 286.795420][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 286.795452][ T31] watchdog+0xfee/0x1030 [ 286.795481][ T31] ? watchdog+0x1de/0x1030 [ 286.795513][ T31] kthread+0x70e/0x8a0 [ 286.795541][ T31] ? __pfx_watchdog+0x10/0x10 [ 286.795566][ T31] ? __pfx_kthread+0x10/0x10 [ 286.795591][ T31] ? __pfx_kthread+0x10/0x10 [ 286.795615][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 286.795638][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 286.795664][ T31] ? __pfx_kthread+0x10/0x10 [ 286.795687][ T31] ret_from_fork+0x4b/0x80 [ 286.795706][ T31] ? __pfx_kthread+0x10/0x10 [ 286.795730][ T31] ret_from_fork_asm+0x1a/0x30 [ 286.795779][ T31] [ 286.795788][ T31] Sending NMI from CPU 0 to CPUs 1: [ 286.947582][ C1] NMI backtrace for cpu 1 [ 286.947599][ C1] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.15.0-rc6-syzkaller-00051-g405e6c37c89e #0 PREEMPT(full) [ 286.947621][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 286.947632][ C1] RIP: 0010:pv_native_safe_halt+0x13/0x20 [ 286.947660][ C1] Code: 43 d4 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 df 18 00 f3 0f 1e fa fb f4 18 d4 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 [ 286.947692][ C1] RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6 [ 286.947709][ C1] RAX: 5231ad0d5e9e1b00 RBX: ffffffff81977048 RCX: 5231ad0d5e9e1b00 [ 286.947723][ C1] RDX: 0000000000000001 RSI: ffffffff8d7387e0 RDI: ffffffff8bc104e0 [ 286.947736][ C1] RBP: ffffc90000197f20 R08: ffff8880b8932b5b R09: 1ffff1101712656b [ 286.947749][ C1] R10: dffffc0000000000 R11: ffffed101712656c R12: ffffffff8f7dd270 [ 286.947763][ C1] R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff110036d1b40 [ 286.947774][ C1] FS: 0000000000000000(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000 [ 286.947789][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 286.947801][ C1] CR2: 000055a22d395168 CR3: 000000000dd38000 CR4: 00000000003526f0 [ 286.947816][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 286.947827][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 286.947838][ C1] Call Trace: [ 286.947847][ C1] [ 286.947853][ C1] default_idle+0x13/0x20 [ 286.947878][ C1] default_idle_call+0x74/0xb0 [ 286.947904][ C1] do_idle+0x1e8/0x510 [ 286.947936][ C1] ? __pfx_do_idle+0x10/0x10 [ 286.947973][ C1] cpu_startup_entry+0x44/0x60 [ 286.948001][ C1] start_secondary+0x101/0x110 [ 286.948029][ C1] common_startup_64+0x13e/0x147 [ 286.948062][ C1] [ 286.948673][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 287.133843][ T31] CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00051-g405e6c37c89e #0 PREEMPT(full) [ 287.145651][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 287.155736][ T31] Call Trace: [ 287.159021][ T31] [ 287.161961][ T31] dump_stack_lvl+0x99/0x250 [ 287.166572][ T31] ? __asan_memcpy+0x40/0x70 [ 287.171173][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 287.176398][ T31] ? __pfx__printk+0x10/0x10 [ 287.181019][ T31] panic+0x2db/0x790 [ 287.185193][ T31] ? __pfx_panic+0x10/0x10 [ 287.189620][ T31] ? nmi_backtrace_stall_check+0x433/0x440 [ 287.195448][ T31] ? preempt_schedule_thunk+0x16/0x30 [ 287.200829][ T31] ? nmi_trigger_cpumask_backtrace+0x2b6/0x300 [ 287.206992][ T31] watchdog+0x102d/0x1030 [ 287.211335][ T31] ? watchdog+0x1de/0x1030 [ 287.215939][ T31] kthread+0x70e/0x8a0 [ 287.220016][ T31] ? __pfx_watchdog+0x10/0x10 [ 287.224703][ T31] ? __pfx_kthread+0x10/0x10 [ 287.229302][ T31] ? __pfx_kthread+0x10/0x10 [ 287.233914][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 287.239121][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 287.244329][ T31] ? __pfx_kthread+0x10/0x10 [ 287.248925][ T31] ret_from_fork+0x4b/0x80 [ 287.253343][ T31] ? __pfx_kthread+0x10/0x10 [ 287.257935][ T31] ret_from_fork_asm+0x1a/0x30 [ 287.262722][ T31] [ 287.266077][ T31] Kernel Offset: disabled [ 287.270403][ T31] Rebooting in 86400 seconds..