Warning: Permanently added '10.128.15.223' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 636.777644][ T1155] INFO: task syz-executor388:6852 blocked for more than 143 seconds. [ 636.785889][ T1155] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 636.793252][ T1155] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.802060][ T1155] task:syz-executor388 state:D stack:28104 pid: 6852 ppid: 6846 flags:0x00004000 [ 636.811410][ T1155] Call Trace: [ 636.814886][ T1155] __schedule+0xea9/0x2230 [ 636.819364][ T1155] ? io_schedule_timeout+0x140/0x140 [ 636.824657][ T1155] ? lockdep_hardirqs_on+0x53/0x100 [ 636.829959][ T1155] schedule+0xd0/0x2a0 [ 636.834075][ T1155] schedule_timeout+0x1d8/0x250 [ 636.839721][ T1155] ? usleep_range+0x170/0x170 [ 636.844605][ T1155] ? lock_downgrade+0x830/0x830 [ 636.850566][ T1155] ? do_raw_spin_lock+0x120/0x2b0 [ 636.855589][ T1155] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.861534][ T1155] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 636.868030][ T1155] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.873236][ T1155] wait_for_completion+0x163/0x260 [ 636.879070][ T1155] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 636.885668][ T1155] ? apparmor_capable+0x1d8/0x460 [ 636.891466][ T1155] ? security_capable+0x8f/0xc0 [ 636.896378][ T1155] io_uring_setup+0x1495/0x29a0 [ 636.901911][ T1155] ? io_sq_thread+0xe00/0xe00 [ 636.906592][ T1155] ? io_issue_sqe+0x5bb0/0x5bb0 [ 636.912180][ T1155] ? io_wake_function+0x2e0/0x2e0 [ 636.917223][ T1155] ? check_preemption_disabled+0x50/0x130 [ 636.923611][ T1155] ? syscall_enter_from_user_mode+0x20/0x290 [ 636.930062][ T1155] ? lockdep_hardirqs_on+0x53/0x100 [ 636.935313][ T1155] do_syscall_64+0x2d/0x70 [ 636.940382][ T1155] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 636.946279][ T1155] RIP: 0033:0x440229 [ 636.950839][ T1155] Code: Bad RIP value. [ 636.954897][ T1155] RSP: 002b:00007fffada1d908 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 636.964592][ T1155] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229 [ 636.973051][ T1155] RDX: 0000000000400ad0 RSI: 00000000200001c0 RDI: 0000000000000bb5 [ 636.981452][ T1155] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 636.989906][ T1155] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30 [ 636.998328][ T1155] R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 [ 637.006321][ T1155] INFO: task io_uring-sq:6853 blocked for more than 143 seconds. [ 637.014798][ T1155] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.022219][ T1155] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 637.031298][ T1155] task:io_uring-sq state:D stack:31200 pid: 6853 ppid: 2 flags:0x00004000 [ 637.040932][ T1155] Call Trace: [ 637.044220][ T1155] __schedule+0xea9/0x2230 [ 637.049455][ T1155] ? io_schedule_timeout+0x140/0x140 [ 637.054753][ T1155] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 637.061226][ T1155] schedule+0xd0/0x2a0 [ 637.065292][ T1155] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 637.071782][ T1155] schedule_preempt_disabled+0xf/0x20 [ 637.077229][ T1155] kthread+0x2ac/0x4a0 [ 637.081957][ T1155] ? __kthread_bind_mask+0xc0/0xc0 [ 637.087115][ T1155] ret_from_fork+0x1f/0x30 [ 637.092198][ T1155] [ 637.092198][ T1155] Showing all locks held in the system: [ 637.100662][ T1155] 1 lock held by khungtaskd/1155: [ 637.105671][ T1155] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.116276][ T1155] 1 lock held by in:imklog/6521: [ 637.121628][ T1155] #0: ffff888094ae80f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.131306][ T1155] [ 637.133632][ T1155] ============================================= [ 637.133632][ T1155] [ 637.142923][ T1155] NMI backtrace for cpu 1 [ 637.147266][ T1155] CPU: 1 PID: 1155 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.156688][ T1155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.166733][ T1155] Call Trace: [ 637.170087][ T1155] dump_stack+0x198/0x1fd [ 637.174436][ T1155] nmi_cpu_backtrace.cold+0x44/0xd7 [ 637.179656][ T1155] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.185284][ T1155] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.191279][ T1155] watchdog+0xd89/0xf30 [ 637.195417][ T1155] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.201139][ T1155] kthread+0x3b5/0x4a0 [ 637.205187][ T1155] ? __kthread_bind_mask+0xc0/0xc0 [ 637.210276][ T1155] ret_from_fork+0x1f/0x30 [ 637.214817][ T1155] Sending NMI from CPU 1 to CPUs 0: [ 637.220215][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 637.221152][ T1155] Kernel panic - not syncing: hung_task: blocked tasks [ 637.235286][ T1155] CPU: 1 PID: 1155 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.244731][ T1155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.254778][ T1155] Call Trace: [ 637.258071][ T1155] dump_stack+0x198/0x1fd [ 637.262450][ T1155] panic+0x347/0x7c0 [ 637.266326][ T1155] ? __warn_printk+0xf3/0xf3 [ 637.270895][ T1155] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.276505][ T1155] ? preempt_schedule_thunk+0x16/0x18 [ 637.281873][ T1155] ? watchdog.cold+0x22d/0x24b [ 637.286635][ T1155] ? watchdog+0xc59/0xf30 [ 637.290970][ T1155] watchdog.cold+0x23e/0x24b [ 637.295557][ T1155] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.301260][ T1155] kthread+0x3b5/0x4a0 [ 637.305310][ T1155] ? __kthread_bind_mask+0xc0/0xc0 [ 637.310405][ T1155] ret_from_fork+0x1f/0x30 [ 637.316403][ T1155] Kernel Offset: disabled [ 637.320746][ T1155] Rebooting in 86400 seconds..