Warning: Permanently added '10.128.1.6' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.363087][ T1174] INFO: task syz-executor915:6853 blocked for more than 143 seconds. [ 616.371373][ T1174] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.380235][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.389592][ T1174] task:syz-executor915 state:D stack:28088 pid: 6853 ppid: 6847 flags:0x00004000 [ 616.399476][ T1174] Call Trace: [ 616.402901][ T1174] __schedule+0xea9/0x2230 [ 616.407920][ T1174] ? io_schedule_timeout+0x140/0x140 [ 616.413709][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 616.419117][ T1174] schedule+0xd0/0x2a0 [ 616.423917][ T1174] schedule_timeout+0x1d8/0x250 [ 616.428765][ T1174] ? usleep_range+0x170/0x170 [ 616.434319][ T1174] ? lock_downgrade+0x830/0x830 [ 616.439162][ T1174] ? do_raw_spin_lock+0x120/0x2b0 [ 616.444929][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.450267][ T1174] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.457042][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.462254][ T1174] wait_for_completion+0x163/0x260 [ 616.468101][ T1174] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.475237][ T1174] ? apparmor_capable+0x1d8/0x460 [ 616.480317][ T1174] ? security_capable+0x8f/0xc0 [ 616.485951][ T1174] io_uring_setup+0x1495/0x29a0 [ 616.490819][ T1174] ? io_sq_thread+0xe00/0xe00 [ 616.496274][ T1174] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.501132][ T1174] ? io_wake_function+0x2e0/0x2e0 [ 616.507092][ T1174] ? check_preemption_disabled+0x50/0x130 [ 616.513515][ T1174] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.519602][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 616.525766][ T1174] do_syscall_64+0x2d/0x70 [ 616.530275][ T1174] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.536907][ T1174] RIP: 0033:0x440299 [ 616.540792][ T1174] Code: Bad RIP value. [ 616.545603][ T1174] RSP: 002b:00007ffd96ae7788 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.555323][ T1174] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 616.563760][ T1174] RDX: 0000000000400b40 RSI: 00000000200006c0 RDI: 000000000000709f [ 616.572701][ T1174] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.582069][ T1174] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 616.590531][ T1174] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 616.599120][ T1174] INFO: task io_uring-sq:6854 blocked for more than 143 seconds. [ 616.607346][ T1174] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.614909][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.624009][ T1174] task:io_uring-sq state:D stack:31200 pid: 6854 ppid: 2 flags:0x00004000 [ 616.633972][ T1174] Call Trace: [ 616.637296][ T1174] __schedule+0xea9/0x2230 [ 616.641702][ T1174] ? io_schedule_timeout+0x140/0x140 [ 616.648054][ T1174] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.654390][ T1174] schedule+0xd0/0x2a0 [ 616.658464][ T1174] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.665028][ T1174] schedule_preempt_disabled+0xf/0x20 [ 616.670561][ T1174] kthread+0x2ac/0x4a0 [ 616.675574][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 616.680777][ T1174] ret_from_fork+0x1f/0x30 [ 616.685934][ T1174] [ 616.685934][ T1174] Showing all locks held in the system: [ 616.694197][ T1174] 1 lock held by khungtaskd/1174: [ 616.699222][ T1174] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.709956][ T1174] 1 lock held by in:imklog/6508: [ 616.715714][ T1174] #0: ffff8880a91d08b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.725444][ T1174] [ 616.727802][ T1174] ============================================= [ 616.727802][ T1174] [ 616.737156][ T1174] NMI backtrace for cpu 1 [ 616.741490][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.750919][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.762348][ T1174] Call Trace: [ 616.765728][ T1174] dump_stack+0x198/0x1fd [ 616.770052][ T1174] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.775285][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.780902][ T1174] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.786929][ T1174] watchdog+0xd89/0xf30 [ 616.791069][ T1174] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.796773][ T1174] kthread+0x3b5/0x4a0 [ 616.800823][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 616.806888][ T1174] ret_from_fork+0x1f/0x30 [ 616.811493][ T1174] Sending NMI from CPU 1 to CPUs 0: [ 616.816904][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 616.817835][ T1174] Kernel panic - not syncing: hung_task: blocked tasks [ 616.831997][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.841427][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.851477][ T1174] Call Trace: [ 616.854763][ T1174] dump_stack+0x198/0x1fd [ 616.859136][ T1174] panic+0x347/0x7c0 [ 616.863022][ T1174] ? __warn_printk+0xf3/0xf3 [ 616.867600][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.874171][ T1174] ? preempt_schedule_thunk+0x16/0x18 [ 616.879525][ T1174] ? watchdog.cold+0x22d/0x24b [ 616.884268][ T1174] ? watchdog+0xc59/0xf30 [ 616.888617][ T1174] watchdog.cold+0x23e/0x24b [ 616.893212][ T1174] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.898928][ T1174] kthread+0x3b5/0x4a0 [ 616.902992][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 616.908093][ T1174] ret_from_fork+0x1f/0x30 [ 616.914117][ T1174] Kernel Offset: disabled [ 616.918469][ T1174] Rebooting in 86400 seconds..