[ 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 '10.128.0.145' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 595.778987][ T1169] INFO: task syz-executor026:6865 blocked for more than 143 seconds. [ 595.787292][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 595.794881][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.803632][ T1169] task:syz-executor026 state:D stack:28104 pid: 6865 ppid: 6859 flags:0x00004000 [ 595.812978][ T1169] Call Trace: [ 595.816423][ T1169] __schedule+0xea9/0x2230 [ 595.820938][ T1169] ? io_schedule_timeout+0x140/0x140 [ 595.826233][ T1169] schedule+0xd0/0x2a0 [ 595.830394][ T1169] schedule_timeout+0x1d8/0x250 [ 595.835260][ T1169] ? usleep_range+0x170/0x170 [ 595.840158][ T1169] ? lock_downgrade+0x830/0x830 [ 595.845040][ T1169] ? do_raw_spin_lock+0x120/0x2b0 [ 595.850127][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.855337][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.861394][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.867651][ T1169] wait_for_completion+0x163/0x260 [ 595.872851][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.878919][ T1169] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 595.885471][ T1169] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 595.891484][ T1169] ? __kthread_bind_mask+0xa1/0xc0 [ 595.896685][ T1169] io_uring_setup+0x1495/0x29a0 [ 595.901602][ T1169] ? io_sq_thread+0xe00/0xe00 [ 595.906287][ T1169] ? io_issue_sqe+0x5bb0/0x5bb0 [ 595.911182][ T1169] ? io_wake_function+0x2e0/0x2e0 [ 595.916300][ T1169] ? check_preemption_disabled+0x50/0x130 [ 595.922093][ T1169] ? syscall_enter_from_user_mode+0x20/0x290 [ 595.928118][ T1169] ? lockdep_hardirqs_on+0x53/0x100 [ 595.933413][ T1169] do_syscall_64+0x2d/0x70 [ 595.937835][ T1169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 595.943934][ T1169] RIP: 0033:0x440299 [ 595.947821][ T1169] Code: Bad RIP value. [ 595.951956][ T1169] RSP: 002b:00007ffe4c28b278 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 595.960443][ T1169] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 595.968410][ T1169] RDX: 0000000000400b40 RSI: 00000000200019c0 RDI: 0000000000004ca3 [ 595.976424][ T1169] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 595.984481][ T1169] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 595.992572][ T1169] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 596.000644][ T1169] INFO: task io_uring-sq:6866 blocked for more than 143 seconds. [ 596.008391][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.015484][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 596.024234][ T1169] task:io_uring-sq state:D stack:31200 pid: 6866 ppid: 2 flags:0x00004000 [ 596.033490][ T1169] Call Trace: [ 596.036873][ T1169] __schedule+0xea9/0x2230 [ 596.041346][ T1169] ? io_schedule_timeout+0x140/0x140 [ 596.046660][ T1169] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.052623][ T1169] schedule+0xd0/0x2a0 [ 596.056695][ T1169] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 596.062560][ T1169] schedule_preempt_disabled+0xf/0x20 [ 596.067957][ T1169] kthread+0x2ac/0x4a0 [ 596.072077][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 596.077248][ T1169] ret_from_fork+0x1f/0x30 [ 596.081748][ T1169] [ 596.081748][ T1169] Showing all locks held in the system: [ 596.089543][ T1169] 1 lock held by khungtaskd/1169: [ 596.094554][ T1169] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 596.104467][ T1169] 1 lock held by in:imklog/6596: [ 596.109473][ T1169] #0: ffff8880a0898630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 596.118645][ T1169] [ 596.121008][ T1169] ============================================= [ 596.121008][ T1169] [ 596.129467][ T1169] NMI backtrace for cpu 0 [ 596.133798][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.143225][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.153259][ T1169] Call Trace: [ 596.156611][ T1169] dump_stack+0x198/0x1fd [ 596.160925][ T1169] nmi_cpu_backtrace.cold+0x44/0xd7 [ 596.166141][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.171771][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 596.177789][ T1169] watchdog+0xd89/0xf30 [ 596.181927][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.187642][ T1169] kthread+0x3b5/0x4a0 [ 596.191704][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 596.196794][ T1169] ret_from_fork+0x1f/0x30 [ 596.201314][ T1169] Sending NMI from CPU 0 to CPUs 1: [ 596.206583][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 [ 596.207552][ T1169] Kernel panic - not syncing: hung_task: blocked tasks [ 596.221653][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.231213][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.241264][ T1169] Call Trace: [ 596.244570][ T1169] dump_stack+0x198/0x1fd [ 596.248935][ T1169] panic+0x347/0x7c0 [ 596.252811][ T1169] ? __warn_printk+0xf3/0xf3 [ 596.257383][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.262991][ T1169] ? preempt_schedule_thunk+0x16/0x18 [ 596.268343][ T1169] ? watchdog.cold+0x22d/0x24b [ 596.273084][ T1169] ? watchdog+0xc59/0xf30 [ 596.277392][ T1169] watchdog.cold+0x23e/0x24b [ 596.281962][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.287659][ T1169] kthread+0x3b5/0x4a0 [ 596.291706][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 596.296795][ T1169] ret_from_fork+0x1f/0x30 [ 596.302766][ T1169] Kernel Offset: disabled [ 596.307093][ T1169] Rebooting in 86400 seconds..