[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.101' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 715.694990][ T1584] INFO: task syz-executor276:8433 blocked for more than 143 seconds. [ 715.703657][ T1584] Not tainted 5.14.0-rc5-syzkaller #0 [ 715.710105][ T1584] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 715.719028][ T1584] task:syz-executor276 state:D stack:27736 pid: 8433 ppid: 8430 flags:0x00004004 [ 715.728318][ T1584] Call Trace: [ 715.731596][ T1584] __schedule+0x93a/0x26f0 [ 715.736213][ T1584] ? io_schedule_timeout+0x140/0x140 [ 715.741582][ T1584] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 715.747422][ T1584] ? do_raw_spin_unlock+0x171/0x230 [ 715.752622][ T1584] schedule+0xd3/0x270 [ 715.756758][ T1584] fuse_wait_on_page_writeback+0x120/0x170 [ 715.762653][ T1584] ? fuse_file_llseek+0x130/0x130 [ 715.767868][ T1584] ? finish_wait+0x270/0x270 [ 715.772668][ T1584] ? end_page_writeback+0x448/0x770 [ 715.777975][ T1584] ? fuse_writepage_locked+0xa53/0xd30 [ 715.783437][ T1584] fuse_launder_page+0xe9/0x130 [ 715.788857][ T1584] ? fuse_writepage_locked+0xd30/0xd30 [ 715.794312][ T1584] invalidate_inode_pages2_range+0x994/0xf80 [ 715.800411][ T1584] ? generic_error_remove_page+0x160/0x160 [ 715.806273][ T1584] ? fuse_send_open+0x200/0x2a0 [ 715.811126][ T1584] ? fuse_range_is_writeback+0x1e0/0x1e0 [ 715.816878][ T1584] ? __init_waitqueue_head+0x6b/0xd0 [ 715.822380][ T1584] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 715.828660][ T1584] ? fuse_file_open+0x2b6/0x630 [ 715.833761][ T1584] fuse_finish_open+0x2d9/0x560 [ 715.838903][ T1584] fuse_open_common+0x2f9/0x4c0 [ 715.843771][ T1584] ? security_file_open+0x205/0x4f0 [ 715.849050][ T1584] ? __mnt_want_write+0x1bc/0x2a0 [ 715.854079][ T1584] do_dentry_open+0x4c8/0x11d0 [ 715.858935][ T1584] ? fuse_open_common+0x4c0/0x4c0 [ 715.863957][ T1584] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 715.870241][ T1584] ? may_open+0x1f6/0x420 [ 715.874656][ T1584] path_openat+0x1c23/0x27f0 [ 715.879337][ T1584] ? path_lookupat+0x860/0x860 [ 715.884114][ T1584] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 715.890152][ T1584] do_filp_open+0x1aa/0x400 [ 715.894726][ T1584] ? may_open_dev+0xf0/0xf0 [ 715.899327][ T1584] ? alloc_fd+0x2f0/0x670 [ 715.903663][ T1584] ? rwlock_bug.part.0+0x90/0x90 [ 715.908636][ T1584] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 715.914951][ T1584] ? _find_next_bit+0x1e3/0x260 [ 715.919804][ T1584] ? _raw_spin_unlock+0x24/0x40 [ 715.924638][ T1584] ? alloc_fd+0x2f0/0x670 [ 715.929010][ T1584] do_sys_openat2+0x16d/0x420 [ 715.933685][ T1584] ? find_held_lock+0x2d/0x110 [ 715.938494][ T1584] ? build_open_flags+0x6f0/0x6f0 [ 715.943519][ T1584] ? __context_tracking_exit+0xb8/0xe0 [ 715.949024][ T1584] ? lock_downgrade+0x6e0/0x6e0 [ 715.953866][ T1584] ? lock_downgrade+0x6e0/0x6e0 [ 715.958860][ T1584] __x64_sys_creat+0xc9/0x120 [ 715.963633][ T1584] ? __x64_compat_sys_openat+0x1f0/0x1f0 [ 715.969345][ T1584] ? syscall_enter_from_user_mode+0x21/0x70 [ 715.975447][ T1584] ? lockdep_hardirqs_on+0x79/0x100 [ 715.980634][ T1584] do_syscall_64+0x35/0xb0 [ 715.985098][ T1584] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 715.990985][ T1584] RIP: 0033:0x446409 [ 715.994993][ T1584] RSP: 002b:00007f0e6a9f92f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 716.003399][ T1584] RAX: ffffffffffffffda RBX: 00000000004d34f0 RCX: 0000000000446409 [ 716.011721][ T1584] RDX: 0000000000446409 RSI: 0000000000000000 RDI: 0000000020000280 [ 716.019744][ T1584] RBP: 00000000004a3164 R08: 0000000000000000 R09: 0000000000000000 [ 716.027770][ T1584] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 716.035791][ T1584] R13: 000000000049f158 R14: 00000000004a1160 R15: 00000000004d34f8 [ 716.043781][ T1584] [ 716.043781][ T1584] Showing all locks held in the system: [ 716.051603][ T1584] 1 lock held by khungtaskd/1584: [ 716.056655][ T1584] #0: ffffffff8b97c1c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.066590][ T1584] 2 locks held by syz-executor276/8433: [ 716.072126][ T1584] #0: ffff888015e38460 (sb_writers#11){.+.+}-{0:0}, at: path_openat+0x1aee/0x27f0 [ 716.081480][ T1584] #1: ffff8880397d0150 (&sb->s_type->i_mutex_key#17){+.+.}-{3:3}, at: fuse_open_common+0x366/0x4c0 [ 716.092384][ T1584] [ 716.094712][ T1584] ============================================= [ 716.094712][ T1584] [ 716.103277][ T1584] NMI backtrace for cpu 1 [ 716.107662][ T1584] CPU: 1 PID: 1584 Comm: khungtaskd Not tainted 5.14.0-rc5-syzkaller #0 [ 716.115984][ T1584] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.126198][ T1584] Call Trace: [ 716.129458][ T1584] dump_stack_lvl+0xcd/0x134 [ 716.134033][ T1584] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.139211][ T1584] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.144395][ T1584] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.150362][ T1584] watchdog+0xd0a/0xfc0 [ 716.154505][ T1584] ? reset_hung_task_detector+0x30/0x30 [ 716.160119][ T1584] kthread+0x3e5/0x4d0 [ 716.164173][ T1584] ? set_kthread_struct+0x130/0x130 [ 716.169355][ T1584] ret_from_fork+0x1f/0x30 [ 716.173832][ T1584] Sending NMI from CPU 1 to CPUs 0: [ 716.179123][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 [ 716.180091][ T1584] Kernel panic - not syncing: hung_task: blocked tasks [ 716.194637][ T1584] CPU: 1 PID: 1584 Comm: khungtaskd Not tainted 5.14.0-rc5-syzkaller #0 [ 716.202945][ T1584] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.212983][ T1584] Call Trace: [ 716.216249][ T1584] dump_stack_lvl+0xcd/0x134 [ 716.220835][ T1584] panic+0x306/0x73d [ 716.224803][ T1584] ? __warn_printk+0xf3/0xf3 [ 716.229380][ T1584] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.234573][ T1584] ? preempt_schedule_thunk+0x16/0x18 [ 716.239930][ T1584] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 716.246075][ T1584] ? watchdog.cold+0x5/0x158 [ 716.250658][ T1584] watchdog.cold+0x16/0x158 [ 716.255154][ T1584] ? reset_hung_task_detector+0x30/0x30 [ 716.260687][ T1584] kthread+0x3e5/0x4d0 [ 716.264743][ T1584] ? set_kthread_struct+0x130/0x130 [ 716.269930][ T1584] ret_from_fork+0x1f/0x30 [ 716.280775][ T1584] Kernel Offset: disabled [ 716.285186][ T1584] Rebooting in 86400 seconds..