[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 595.832207][ T1170] INFO: task syz-executor499:6859 blocked for more than 143 seconds. [ 595.840500][ T1170] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 595.849366][ T1170] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.858173][ T1170] task:syz-executor499 state:D stack:28104 pid: 6859 ppid: 6853 flags:0x00004000 [ 595.867696][ T1170] Call Trace: [ 595.871140][ T1170] __schedule+0xea9/0x2230 [ 595.875634][ T1170] ? io_schedule_timeout+0x140/0x140 [ 595.880936][ T1170] schedule+0xd0/0x2a0 [ 595.885052][ T1170] schedule_timeout+0x1d8/0x250 [ 595.889913][ T1170] ? usleep_range+0x170/0x170 [ 595.894749][ T1170] ? lock_downgrade+0x830/0x830 [ 595.899614][ T1170] ? do_raw_spin_lock+0x120/0x2b0 [ 595.904687][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.909892][ T1170] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.915932][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.921239][ T1170] wait_for_completion+0x163/0x260 [ 595.926400][ T1170] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.932460][ T1170] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 595.938949][ T1170] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 595.944870][ T1170] ? __kthread_bind_mask+0xa1/0xc0 [ 595.950075][ T1170] io_uring_setup+0x1495/0x29a0 [ 595.955007][ T1170] ? io_sq_thread+0xe00/0xe00 [ 595.959700][ T1170] ? io_issue_sqe+0x5bb0/0x5bb0 [ 595.964612][ T1170] ? io_wake_function+0x2e0/0x2e0 [ 595.969651][ T1170] ? check_preemption_disabled+0x50/0x130 [ 595.975418][ T1170] ? syscall_enter_from_user_mode+0x20/0x290 [ 595.981418][ T1170] ? lockdep_hardirqs_on+0x53/0x100 [ 595.986820][ T1170] do_syscall_64+0x2d/0x70 [ 595.991266][ T1170] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 595.997247][ T1170] RIP: 0033:0x440299 [ 596.001150][ T1170] Code: Bad RIP value. [ 596.005265][ T1170] RSP: 002b:00007ffea4e32258 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 596.013854][ T1170] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 596.021829][ T1170] RDX: 0000000000400b40 RSI: 0000000020000040 RDI: 0000000000004e24 [ 596.029872][ T1170] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 596.037905][ T1170] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 596.045953][ T1170] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 596.054031][ T1170] INFO: task io_uring-sq:6860 blocked for more than 143 seconds. [ 596.061739][ T1170] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.068809][ T1170] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 596.077548][ T1170] task:io_uring-sq state:D stack:31200 pid: 6860 ppid: 2 flags:0x00004000 [ 596.086854][ T1170] Call Trace: [ 596.090145][ T1170] __schedule+0xea9/0x2230 [ 596.094621][ T1170] ? io_schedule_timeout+0x140/0x140 [ 596.099925][ T1170] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.105833][ T1170] schedule+0xd0/0x2a0 [ 596.109903][ T1170] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 596.115762][ T1170] schedule_preempt_disabled+0xf/0x20 [ 596.121154][ T1170] kthread+0x2ac/0x4a0 [ 596.125288][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 596.130479][ T1170] ret_from_fork+0x1f/0x30 [ 596.134964][ T1170] [ 596.134964][ T1170] Showing all locks held in the system: [ 596.142753][ T1170] 3 locks held by kworker/0:0/5: [ 596.147680][ T1170] #0: ffff8880ae635fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x270/0x2230 [ 596.156534][ T1170] #1: ffff8880ae620ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2fb/0x400 [ 596.168022][ T1170] #2: ffff8880ae626698 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x55/0x1a0 [ 596.177401][ T1170] 1 lock held by khungtaskd/1170: [ 596.182478][ T1170] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 596.192416][ T1170] 2 locks held by in:imklog/6550: [ 596.197447][ T1170] #0: ffff8880a279b170 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 596.206668][ T1170] #1: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: is_bpf_text_address+0x0/0x160 [ 596.216453][ T1170] [ 596.218775][ T1170] ============================================= [ 596.218775][ T1170] [ 596.227244][ T1170] NMI backtrace for cpu 1 [ 596.231587][ T1170] CPU: 1 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.241029][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.251065][ T1170] Call Trace: [ 596.254445][ T1170] dump_stack+0x198/0x1fd [ 596.258758][ T1170] nmi_cpu_backtrace.cold+0x44/0xd7 [ 596.263995][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.269613][ T1170] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 596.275626][ T1170] watchdog+0xd89/0xf30 [ 596.279780][ T1170] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.285480][ T1170] kthread+0x3b5/0x4a0 [ 596.289528][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 596.294621][ T1170] ret_from_fork+0x1f/0x30 [ 596.299097][ T1170] Sending NMI from CPU 1 to CPUs 0: [ 596.304388][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 596.305327][ T1170] Kernel panic - not syncing: hung_task: blocked tasks [ 596.319481][ T1170] CPU: 1 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.328909][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.338940][ T1170] Call Trace: [ 596.342213][ T1170] dump_stack+0x198/0x1fd [ 596.346596][ T1170] panic+0x347/0x7c0 [ 596.350474][ T1170] ? __warn_printk+0xf3/0xf3 [ 596.355047][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.360675][ T1170] ? preempt_schedule_thunk+0x16/0x18 [ 596.366042][ T1170] ? watchdog.cold+0x22d/0x24b [ 596.370796][ T1170] ? watchdog+0xc59/0xf30 [ 596.375121][ T1170] watchdog.cold+0x23e/0x24b [ 596.379696][ T1170] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.385397][ T1170] kthread+0x3b5/0x4a0 [ 596.389448][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 596.394540][ T1170] ret_from_fork+0x1f/0x30 [ 596.400368][ T1170] Kernel Offset: disabled [ 596.404700][ T1170] Rebooting in 86400 seconds..