Warning: Permanently added '10.128.0.144' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 595.751979][ T1171] INFO: task syz-executor498:6874 blocked for more than 143 seconds. [ 595.760289][ T1171] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 595.769009][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.778215][ T1171] task:syz-executor498 state:D stack:28104 pid: 6874 ppid: 6868 flags:0x00004000 [ 595.788608][ T1171] Call Trace: [ 595.792552][ T1171] __schedule+0xea9/0x2230 [ 595.797008][ T1171] ? io_schedule_timeout+0x140/0x140 [ 595.803085][ T1171] ? lockdep_hardirqs_on+0x53/0x100 [ 595.808283][ T1171] schedule+0xd0/0x2a0 [ 595.813106][ T1171] schedule_timeout+0x1d8/0x250 [ 595.817967][ T1171] ? usleep_range+0x170/0x170 [ 595.823407][ T1171] ? lock_downgrade+0x830/0x830 [ 595.828283][ T1171] ? do_raw_spin_lock+0x120/0x2b0 [ 595.834020][ T1171] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.839226][ T1171] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.845909][ T1171] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.851104][ T1171] wait_for_completion+0x163/0x260 [ 595.856964][ T1171] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 595.864038][ T1171] ? apparmor_capable+0x1d8/0x460 [ 595.869127][ T1171] ? security_capable+0x8f/0xc0 [ 595.874749][ T1171] io_uring_setup+0x1495/0x29a0 [ 595.879597][ T1171] ? io_connect+0x510/0x510 [ 595.884767][ T1171] ? io_sq_thread+0xe00/0xe00 [ 595.889433][ T1171] ? io_wake_function+0x2e0/0x2e0 [ 595.895130][ T1171] ? check_preemption_disabled+0x50/0x130 [ 595.900843][ T1171] ? syscall_enter_from_user_mode+0x20/0x290 [ 595.907468][ T1171] ? lockdep_hardirqs_on+0x53/0x100 [ 595.913726][ T1171] do_syscall_64+0x2d/0x70 [ 595.918133][ T1171] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 595.925322][ T1171] RIP: 0033:0x440299 [ 595.929200][ T1171] Code: Bad RIP value. [ 595.933878][ T1171] RSP: 002b:00007ffdecfac498 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 595.942733][ T1171] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 595.950704][ T1171] RDX: 0000000000400b40 RSI: 0000000020000180 RDI: 000000000000726e [ 595.959344][ T1171] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 595.967754][ T1171] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 595.976167][ T1171] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 595.984612][ T1171] INFO: task io_uring-sq:6875 blocked for more than 143 seconds. [ 595.993294][ T1171] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.000297][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 596.009599][ T1171] task:io_uring-sq state:D stack:31200 pid: 6875 ppid: 2 flags:0x00004000 [ 596.019375][ T1171] Call Trace: [ 596.023090][ T1171] __schedule+0xea9/0x2230 [ 596.027508][ T1171] ? io_schedule_timeout+0x140/0x140 [ 596.033457][ T1171] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.039257][ T1171] schedule+0xd0/0x2a0 [ 596.044535][ T1171] ? __do_sys_io_uring_enter+0x1b00/0x1b00 [ 596.050331][ T1171] schedule_preempt_disabled+0xf/0x20 [ 596.056492][ T1171] kthread+0x2ac/0x4a0 [ 596.060552][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 596.066429][ T1171] ret_from_fork+0x1f/0x30 [ 596.070860][ T1171] [ 596.070860][ T1171] Showing all locks held in the system: [ 596.079301][ T1171] 1 lock held by khungtaskd/1171: [ 596.084791][ T1171] #0: ffffffff89c67980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 596.095399][ T1171] 1 lock held by in:imklog/6608: [ 596.100319][ T1171] #0: ffff8880a1da0870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 596.110224][ T1171] [ 596.113195][ T1171] ============================================= [ 596.113195][ T1171] [ 596.121604][ T1171] NMI backtrace for cpu 1 [ 596.126040][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.135481][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.145513][ T1171] Call Trace: [ 596.148864][ T1171] dump_stack+0x198/0x1fd [ 596.153210][ T1171] nmi_cpu_backtrace.cold+0x44/0xd7 [ 596.158473][ T1171] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.164098][ T1171] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 596.170098][ T1171] watchdog+0xd89/0xf30 [ 596.174247][ T1171] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.179944][ T1171] kthread+0x3b5/0x4a0 [ 596.183992][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 596.189101][ T1171] ret_from_fork+0x1f/0x30 [ 596.193645][ T1171] Sending NMI from CPU 1 to CPUs 0: [ 596.198917][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 596.200758][ T1171] Kernel panic - not syncing: hung_task: blocked tasks [ 596.214091][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.223520][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.233550][ T1171] Call Trace: [ 596.236820][ T1171] dump_stack+0x198/0x1fd [ 596.241218][ T1171] panic+0x347/0x7c0 [ 596.245108][ T1171] ? __warn_printk+0xf3/0xf3 [ 596.249748][ T1171] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.255372][ T1171] ? preempt_schedule_thunk+0x16/0x18 [ 596.260734][ T1171] ? watchdog.cold+0x22d/0x24b [ 596.265615][ T1171] ? watchdog+0xc59/0xf30 [ 596.269931][ T1171] watchdog.cold+0x23e/0x24b [ 596.274507][ T1171] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.280223][ T1171] kthread+0x3b5/0x4a0 [ 596.284275][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 596.289381][ T1171] ret_from_fork+0x1f/0x30 [ 596.295198][ T1171] Kernel Offset: disabled [ 596.299523][ T1171] Rebooting in 86400 seconds..