[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 721.173945][ T1666] INFO: task syz-executor458:8401 blocked for more than 143 seconds. [ 721.182160][ T1666] Not tainted 5.11.0-next-20210226-syzkaller #0 [ 721.190790][ T1666] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.199889][ T1666] task:syz-executor458 state:D stack:27536 pid: 8401 ppid: 8400 flags:0x00004004 [ 721.209245][ T1666] Call Trace: [ 721.212555][ T1666] __schedule+0x90c/0x21a0 [ 721.217095][ T1666] ? io_schedule_timeout+0x140/0x140 [ 721.222403][ T1666] ? lock_chain_count+0x20/0x20 [ 721.227371][ T1666] schedule+0xcf/0x270 [ 721.231463][ T1666] schedule_timeout+0x1db/0x250 [ 721.236353][ T1666] ? usleep_range+0x170/0x170 [ 721.241034][ T1666] ? wait_for_completion+0x160/0x270 [ 721.246423][ T1666] ? mark_held_locks+0x9f/0xe0 [ 721.251198][ T1666] ? rwlock_bug.part.0+0x90/0x90 [ 721.256195][ T1666] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.261411][ T1666] wait_for_completion+0x168/0x270 [ 721.267475][ T1666] ? bit_wait_io_timeout+0x160/0x160 [ 721.272792][ T1666] ? do_raw_spin_lock+0x120/0x2b0 [ 721.278500][ T1666] ? rwlock_bug.part.0+0x90/0x90 [ 721.283462][ T1666] io_sq_thread_park+0xd5/0x130 [ 721.288422][ T1666] io_uring_cancel_task_requests+0x24c/0xd90 [ 721.294500][ T1666] ? io_openat2+0x8f0/0x8f0 [ 721.299008][ T1666] ? xa_find+0x1fb/0x320 [ 721.303268][ T1666] ? xas_find+0x7e0/0x7e0 [ 721.307665][ T1666] ? lock_release+0x3bb/0x710 [ 721.312349][ T1666] __io_uring_files_cancel+0x110/0x230 [ 721.317843][ T1666] ? __io_uring_free+0xc0/0xc0 [ 721.322617][ T1666] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.328985][ T1666] ? __validate_process_creds+0x20c/0x370 [ 721.334828][ T1666] do_exit+0x299/0x2a60 [ 721.339064][ T1666] ? find_held_lock+0x2d/0x110 [ 721.343910][ T1666] ? lock_release+0x3bb/0x710 [ 721.348589][ T1666] ? mm_update_next_owner+0x7a0/0x7a0 [ 721.354073][ T1666] ? lock_downgrade+0x6d0/0x6d0 [ 721.358930][ T1666] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.364188][ T1666] do_group_exit+0x125/0x310 [ 721.368818][ T1666] __x64_sys_exit_group+0x3a/0x50 [ 721.373901][ T1666] do_syscall_64+0x2d/0x70 [ 721.378340][ T1666] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 721.384291][ T1666] RIP: 0033:0x43e899 [ 721.388190][ T1666] RSP: 002b:00007ffe89376d48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 721.397523][ T1666] RAX: ffffffffffffffda RBX: 00000000004af2f0 RCX: 000000000043e899 [ 721.406150][ T1666] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 721.414305][ T1666] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000010000000 [ 721.422352][ T1666] R10: 0000000000008011 R11: 0000000000000246 R12: 00000000004af2f0 [ 721.430373][ T1666] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 721.438558][ T1666] INFO: task iou-sqp-8401:8402 can't die for more than 143 seconds. [ 721.446578][ T1666] task:iou-sqp-8401 state:D stack:30272 pid: 8402 ppid: 8400 flags:0x00004004 [ 721.455853][ T1666] Call Trace: [ 721.459137][ T1666] __schedule+0x90c/0x21a0 [ 721.463560][ T1666] ? io_schedule_timeout+0x140/0x140 [ 721.468935][ T1666] schedule+0xcf/0x270 [ 721.473028][ T1666] schedule_timeout+0x1db/0x250 [ 721.477932][ T1666] ? usleep_range+0x170/0x170 [ 721.482619][ T1666] ? wait_for_completion+0x160/0x270 [ 721.487958][ T1666] ? lock_downgrade+0x6d0/0x6d0 [ 721.492828][ T1666] ? do_raw_spin_lock+0x120/0x2b0 [ 721.497904][ T1666] ? rwlock_bug.part.0+0x90/0x90 [ 721.502866][ T1666] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.508101][ T1666] wait_for_completion+0x168/0x270 [ 721.513219][ T1666] ? lock_downgrade+0x6d0/0x6d0 [ 721.518139][ T1666] ? bit_wait_io_timeout+0x160/0x160 [ 721.523434][ T1666] ? _raw_spin_unlock_irqrestore+0x28/0x50 [ 721.530116][ T1666] io_sq_thread+0x27d/0x1ae0 [ 721.535198][ T1666] ? lock_is_held_type+0xd5/0x130 [ 721.540274][ T1666] ? find_held_lock+0x2d/0x110 [ 721.545093][ T1666] ? io_submit_sqes+0x63d0/0x63d0 [ 721.550124][ T1666] ? lock_release+0x3bb/0x710 [ 721.554855][ T1666] ? ret_from_fork+0x8/0x30 [ 721.559397][ T1666] ? finish_wait+0x260/0x260 [ 721.564078][ T1666] ? rwlock_bug.part.0+0x90/0x90 [ 721.569033][ T1666] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.574336][ T1666] ? io_submit_sqes+0x63d0/0x63d0 [ 721.579392][ T1666] ret_from_fork+0x1f/0x30 [ 721.583880][ T1666] INFO: task iou-sqp-8401:8402 blocked for more than 143 seconds. [ 721.591676][ T1666] Not tainted 5.11.0-next-20210226-syzkaller #0 [ 721.598460][ T1666] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.607212][ T1666] task:iou-sqp-8401 state:D stack:30272 pid: 8402 ppid: 8400 flags:0x00004004 [ 721.616467][ T1666] Call Trace: [ 721.619754][ T1666] __schedule+0x90c/0x21a0 [ 721.624251][ T1666] ? io_schedule_timeout+0x140/0x140 [ 721.629549][ T1666] schedule+0xcf/0x270 [ 721.633606][ T1666] schedule_timeout+0x1db/0x250 [ 721.638510][ T1666] ? usleep_range+0x170/0x170 [ 721.643189][ T1666] ? wait_for_completion+0x160/0x270 [ 721.648543][ T1666] ? lock_downgrade+0x6d0/0x6d0 [ 721.653403][ T1666] ? do_raw_spin_lock+0x120/0x2b0 [ 721.659253][ T1666] ? rwlock_bug.part.0+0x90/0x90 [ 721.664710][ T1666] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.669928][ T1666] wait_for_completion+0x168/0x270 [ 721.675131][ T1666] ? lock_downgrade+0x6d0/0x6d0 [ 721.679991][ T1666] ? bit_wait_io_timeout+0x160/0x160 [ 721.685383][ T1666] ? _raw_spin_unlock_irqrestore+0x28/0x50 [ 721.691306][ T1666] io_sq_thread+0x27d/0x1ae0 [ 721.695956][ T1666] ? lock_is_held_type+0xd5/0x130 [ 721.701016][ T1666] ? find_held_lock+0x2d/0x110 [ 721.705817][ T1666] ? io_submit_sqes+0x63d0/0x63d0 [ 721.710847][ T1666] ? lock_release+0x3bb/0x710 [ 721.715589][ T1666] ? ret_from_fork+0x8/0x30 [ 721.720099][ T1666] ? finish_wait+0x260/0x260 [ 721.724732][ T1666] ? rwlock_bug.part.0+0x90/0x90 [ 721.729680][ T1666] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.734950][ T1666] ? io_submit_sqes+0x63d0/0x63d0 [ 721.739989][ T1666] ret_from_fork+0x1f/0x30 [ 721.744532][ T1666] [ 721.744532][ T1666] Showing all locks held in the system: [ 721.752242][ T1666] 1 lock held by khungtaskd/1666: [ 721.757347][ T1666] #0: ffffffff8bf741e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.767324][ T1666] 1 lock held by syz-executor458/8401: [ 721.772779][ T1666] #0: ffff88801cafe870 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread_park+0x5d/0x130 [ 721.782160][ T1666] [ 721.785152][ T1666] ============================================= [ 721.785152][ T1666] [ 721.793543][ T1666] NMI backtrace for cpu 0 [ 721.797940][ T1666] CPU: 0 PID: 1666 Comm: khungtaskd Not tainted 5.11.0-next-20210226-syzkaller #0 [ 721.807231][ T1666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.817296][ T1666] Call Trace: [ 721.820561][ T1666] dump_stack+0xfa/0x151 [ 721.824843][ T1666] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.830033][ T1666] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.835246][ T1666] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.841237][ T1666] watchdog+0xd8e/0xf40 [ 721.845377][ T1666] ? trace_sched_process_hang+0x280/0x280 [ 721.851082][ T1666] kthread+0x3b1/0x4a0 [ 721.855149][ T1666] ? __kthread_bind_mask+0xc0/0xc0 [ 721.860250][ T1666] ret_from_fork+0x1f/0x30 [ 721.864751][ T1666] Sending NMI from CPU 0 to CPUs 1: [ 721.870013][ C1] NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c9/0x250 [ 721.871002][ T1666] Kernel panic - not syncing: hung_task: blocked tasks [ 721.885542][ T1666] CPU: 0 PID: 1666 Comm: khungtaskd Not tainted 5.11.0-next-20210226-syzkaller #0 [ 721.894766][ T1666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.904808][ T1666] Call Trace: [ 721.908073][ T1666] dump_stack+0xfa/0x151 [ 721.912300][ T1666] panic+0x306/0x73d [ 721.916343][ T1666] ? __warn_printk+0xf3/0xf3 [ 721.921010][ T1666] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.926188][ T1666] ? preempt_schedule_thunk+0x16/0x18 [ 721.931588][ T1666] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 721.937728][ T1666] ? watchdog.cold+0x22d/0x248 [ 721.942489][ T1666] watchdog.cold+0x23e/0x248 [ 721.947075][ T1666] ? trace_sched_process_hang+0x280/0x280 [ 721.952781][ T1666] kthread+0x3b1/0x4a0 [ 721.956836][ T1666] ? __kthread_bind_mask+0xc0/0xc0 [ 721.961941][ T1666] ret_from_fork+0x1f/0x30 [ 721.967052][ T1666] Kernel Offset: disabled [ 721.971399][ T1666] Rebooting in 86400 seconds..