[ 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 '10.128.0.247' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.243812][ T1171] INFO: task syz-executor078:6869 blocked for more than 143 seconds. [ 616.252066][ T1171] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.260704][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.269630][ T1171] task:syz-executor078 state:D stack:28104 pid: 6869 ppid: 6863 flags:0x00004000 [ 616.279146][ T1171] Call Trace: [ 616.282579][ T1171] __schedule+0xea9/0x2230 [ 616.287962][ T1171] ? io_schedule_timeout+0x140/0x140 [ 616.293278][ T1171] schedule+0xd0/0x2a0 [ 616.297426][ T1171] schedule_timeout+0x1d8/0x250 [ 616.302277][ T1171] ? usleep_range+0x170/0x170 [ 616.307332][ T1171] ? lock_downgrade+0x830/0x830 [ 616.312225][ T1171] ? do_raw_spin_lock+0x120/0x2b0 [ 616.317364][ T1171] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.322575][ T1171] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.328634][ T1171] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.333960][ T1171] wait_for_completion+0x163/0x260 [ 616.339089][ T1171] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.345139][ T1171] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.351658][ T1171] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 616.357695][ T1171] ? __kthread_bind_mask+0xa1/0xc0 [ 616.362904][ T1171] io_uring_setup+0x1495/0x29a0 [ 616.368615][ T1171] ? io_sq_thread+0xe00/0xe00 [ 616.373295][ T1171] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.378252][ T1171] ? io_wake_function+0x2e0/0x2e0 [ 616.383304][ T1171] ? check_preemption_disabled+0x50/0x130 [ 616.389076][ T1171] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.395283][ T1171] ? lockdep_hardirqs_on+0x53/0x100 [ 616.400559][ T1171] do_syscall_64+0x2d/0x70 [ 616.405068][ T1171] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.410998][ T1171] RIP: 0033:0x440299 [ 616.414984][ T1171] Code: Bad RIP value. [ 616.419150][ T1171] RSP: 002b:00007ffe330b2af8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.427835][ T1171] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 616.436549][ T1171] RDX: 0000000000400b40 RSI: 0000000020000180 RDI: 0000000000007741 [ 616.444598][ T1171] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.452584][ T1171] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 616.460667][ T1171] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 616.468772][ T1171] INFO: task io_uring-sq:6870 blocked for more than 143 seconds. [ 616.476573][ T1171] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.483662][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.492475][ T1171] task:io_uring-sq state:D stack:31200 pid: 6870 ppid: 2 flags:0x00004000 [ 616.501795][ T1171] Call Trace: [ 616.505176][ T1171] __schedule+0xea9/0x2230 [ 616.509618][ T1171] ? io_schedule_timeout+0x140/0x140 [ 616.515007][ T1171] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.520843][ T1171] schedule+0xd0/0x2a0 [ 616.525004][ T1171] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.530822][ T1171] schedule_preempt_disabled+0xf/0x20 [ 616.536306][ T1171] kthread+0x2ac/0x4a0 [ 616.540397][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 616.545660][ T1171] ret_from_fork+0x1f/0x30 [ 616.550114][ T1171] [ 616.550114][ T1171] Showing all locks held in the system: [ 616.558636][ T1171] 1 lock held by khungtaskd/1171: [ 616.563724][ T1171] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.573721][ T1171] [ 616.576047][ T1171] ============================================= [ 616.576047][ T1171] [ 616.584497][ T1171] NMI backtrace for cpu 1 [ 616.588827][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.598691][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.608734][ T1171] Call Trace: [ 616.612140][ T1171] dump_stack+0x198/0x1fd [ 616.616479][ T1171] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.621723][ T1171] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.627378][ T1171] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.633434][ T1171] watchdog+0xd89/0xf30 [ 616.637579][ T1171] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.643307][ T1171] kthread+0x3b5/0x4a0 [ 616.647360][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 616.652453][ T1171] ret_from_fork+0x1f/0x30 [ 616.657026][ T1171] Sending NMI from CPU 1 to CPUs 0: [ 616.662666][ C0] NMI backtrace for cpu 0 [ 616.662673][ C0] CPU: 0 PID: 3910 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.662680][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.662685][ C0] RIP: 0010:rcu_is_watching+0x80/0xb0 [ 616.662696][ C0] Code: c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 25 8b 83 28 01 00 00 d1 e8 83 e0 01 65 ff 0d 00 89 a0 7e <74> 06 48 83 c4 08 5b c3 e8 d2 00 9f ff 48 83 c4 08 5b c3 e8 c8 e1 [ 616.662701][ C0] RSP: 0018:ffffc90000f37e28 EFLAGS: 00000282 [ 616.662710][ C0] RAX: 0000000000000001 RBX: ffff8880ae636dc0 RCX: 1ffffffff130b120 [ 616.662716][ C0] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8880ae636ee8 [ 616.662722][ C0] RBP: 1ffff920001e6fcc R08: 0000000000000000 R09: ffffffff8abcb60f [ 616.662728][ C0] R10: fffffbfff15796c1 R11: 0000000000000000 R12: 0000000000000001 [ 616.662733][ C0] R13: ffffffff89c67500 R14: ffffffff814d2a27 R15: 0000000000000000 [ 616.662740][ C0] FS: 00007fadbcdb58c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 616.662745][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.662750][ C0] CR2: 00007fadba0f0000 CR3: 0000000092ded000 CR4: 00000000001506f0 [ 616.662756][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.662762][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.662765][ C0] Call Trace: [ 616.662769][ C0] rcu_read_lock_sched_held+0x1c/0xb0 [ 616.662773][ C0] lock_release+0x6a1/0x8f0 [ 616.662778][ C0] ? lock_downgrade+0x830/0x830 [ 616.662782][ C0] ? lock_is_held_type+0xbb/0xf0 [ 616.662786][ C0] __task_pid_nr_ns+0x1d9/0x490 [ 616.662790][ C0] __do_sys_getpid+0x1a/0x20 [ 616.662794][ C0] do_syscall_64+0x2d/0x70 [ 616.662799][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.662803][ C0] RIP: 0033:0x7fadbc04ef17 [ 616.662814][ C0] Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 [ 616.662818][ C0] RSP: 002b:00007fff53f882e8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 [ 616.662828][ C0] RAX: ffffffffffffffda RBX: 000056233eca71e0 RCX: 00007fadbc04ef17 [ 616.662834][ C0] RDX: 0000000000000000 RSI: 0000000024c18a02 RDI: 000056233eca71e0 [ 616.662840][ C0] RBP: 0000000000000f46 R08: 000056233eca9320 R09: 00007fff53f8f0f0 [ 616.662845][ C0] R10: 000000000001243a R11: 0000000000000202 R12: ffffffffffffffff [ 616.662851][ C0] R13: 00007fff53f88398 R14: 000056233d791958 R15: 0005ae6e241370c4 [ 616.663289][ T1171] Kernel panic - not syncing: hung_task: blocked tasks [ 616.919920][ T1171] CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.929382][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.940123][ T1171] Call Trace: [ 616.943419][ T1171] dump_stack+0x198/0x1fd [ 616.947801][ T1171] panic+0x347/0x7c0 [ 616.951687][ T1171] ? __warn_printk+0xf3/0xf3 [ 616.956283][ T1171] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.961896][ T1171] ? preempt_schedule_thunk+0x16/0x18 [ 616.967255][ T1171] ? watchdog.cold+0x22d/0x24b [ 616.972017][ T1171] ? watchdog+0xc59/0xf30 [ 616.976331][ T1171] watchdog.cold+0x23e/0x24b [ 616.980904][ T1171] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.986608][ T1171] kthread+0x3b5/0x4a0 [ 616.990670][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 616.995781][ T1171] ret_from_fork+0x1f/0x30 [ 617.001428][ T1171] Kernel Offset: disabled [ 617.005755][ T1171] Rebooting in 86400 seconds..