Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.335185][ T1169] INFO: task syz-executor238:6861 blocked for more than 143 seconds. [ 616.343417][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.351904][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.361057][ T1169] task:syz-executor238 state:D stack:28104 pid: 6861 ppid: 6855 flags:0x00004000 [ 616.370738][ T1169] Call Trace: [ 616.374127][ T1169] __schedule+0xea9/0x2230 [ 616.379201][ T1169] ? io_schedule_timeout+0x140/0x140 [ 616.384485][ T1169] schedule+0xd0/0x2a0 [ 616.389726][ T1169] schedule_timeout+0x1d8/0x250 [ 616.394564][ T1169] ? usleep_range+0x170/0x170 [ 616.400554][ T1169] ? lock_downgrade+0x830/0x830 [ 616.405818][ T1169] ? do_raw_spin_lock+0x120/0x2b0 [ 616.410867][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.416668][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.422638][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.428474][ T1169] wait_for_completion+0x163/0x260 [ 616.433575][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.440233][ T1169] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.447981][ T1169] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 616.453857][ T1169] ? __kthread_bind_mask+0xa1/0xc0 [ 616.459648][ T1169] io_uring_setup+0x1495/0x29a0 [ 616.464490][ T1169] ? io_sq_thread+0xe00/0xe00 [ 616.469791][ T1169] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.474629][ T1169] ? io_wake_function+0x2e0/0x2e0 [ 616.480333][ T1169] ? check_preemption_disabled+0x50/0x130 [ 616.486460][ T1169] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.492425][ T1169] ? lockdep_hardirqs_on+0x53/0x100 [ 616.498289][ T1169] do_syscall_64+0x2d/0x70 [ 616.502720][ T1169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.509263][ T1169] RIP: 0033:0x440299 [ 616.513140][ T1169] Code: Bad RIP value. [ 616.517813][ T1169] RSP: 002b:00007fffdcad1e18 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.526634][ T1169] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 616.534593][ T1169] RDX: 0000000000400b40 RSI: 00000000200000c0 RDI: 00000000000057a4 [ 616.543197][ T1169] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.551578][ T1169] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 616.559955][ T1169] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 616.568450][ T1169] INFO: task io_uring-sq:6862 blocked for more than 143 seconds. [ 616.576740][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.583754][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.593089][ T1169] task:io_uring-sq state:D stack:31200 pid: 6862 ppid: 2 flags:0x00004000 [ 616.602841][ T1169] Call Trace: [ 616.606582][ T1169] __schedule+0xea9/0x2230 [ 616.610991][ T1169] ? io_schedule_timeout+0x140/0x140 [ 616.616947][ T1169] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.622745][ T1169] schedule+0xd0/0x2a0 [ 616.627435][ T1169] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.633278][ T1169] schedule_preempt_disabled+0xf/0x20 [ 616.639325][ T1169] kthread+0x2ac/0x4a0 [ 616.643381][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 616.649285][ T1169] ret_from_fork+0x1f/0x30 [ 616.653723][ T1169] [ 616.653723][ T1169] Showing all locks held in the system: [ 616.662190][ T1169] 1 lock held by khungtaskd/1169: [ 616.667708][ T1169] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.678324][ T1169] 1 lock held by in:imklog/6541: [ 616.683241][ T1169] #0: ffff8880a46f3130 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.693118][ T1169] [ 616.696045][ T1169] ============================================= [ 616.696045][ T1169] [ 616.704435][ T1169] NMI backtrace for cpu 0 [ 616.708858][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.718294][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.728324][ T1169] Call Trace: [ 616.731665][ T1169] dump_stack+0x198/0x1fd [ 616.735975][ T1169] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.741182][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.746837][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.752837][ T1169] watchdog+0xd89/0xf30 [ 616.756973][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.762817][ T1169] kthread+0x3b5/0x4a0 [ 616.766861][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 616.771947][ T1169] ret_from_fork+0x1f/0x30 [ 616.776459][ T1169] Sending NMI from CPU 0 to CPUs 1: [ 616.781765][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 [ 616.782682][ T1169] Kernel panic - not syncing: hung_task: blocked tasks [ 616.796831][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.806253][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.816280][ T1169] Call Trace: [ 616.819549][ T1169] dump_stack+0x198/0x1fd [ 616.823929][ T1169] panic+0x347/0x7c0 [ 616.827809][ T1169] ? __warn_printk+0xf3/0xf3 [ 616.832376][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.837994][ T1169] ? preempt_schedule_thunk+0x16/0x18 [ 616.843348][ T1169] ? watchdog.cold+0x22d/0x24b [ 616.848120][ T1169] ? watchdog+0xc59/0xf30 [ 616.852428][ T1169] watchdog.cold+0x23e/0x24b [ 616.856997][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.862707][ T1169] kthread+0x3b5/0x4a0 [ 616.866753][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 616.871838][ T1169] ret_from_fork+0x1f/0x30 [ 616.877669][ T1169] Kernel Offset: disabled [ 616.881997][ T1169] Rebooting in 86400 seconds..