[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.177' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 596.018273][ T1174] INFO: task syz-executor115:6858 blocked for more than 143 seconds. [ 596.026917][ T1174] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.035815][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 596.045558][ T1174] task:syz-executor115 state:D stack:28104 pid: 6858 ppid: 6852 flags:0x00004000 [ 596.056255][ T1174] Call Trace: [ 596.060620][ T1174] __schedule+0xea9/0x2230 [ 596.065535][ T1174] ? io_schedule_timeout+0x140/0x140 [ 596.072198][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 596.077610][ T1174] schedule+0xd0/0x2a0 [ 596.082551][ T1174] schedule_timeout+0x1d8/0x250 [ 596.087938][ T1174] ? usleep_range+0x170/0x170 [ 596.093164][ T1174] ? lock_downgrade+0x830/0x830 [ 596.098658][ T1174] ? do_raw_spin_lock+0x120/0x2b0 [ 596.103713][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 596.109148][ T1174] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 596.115594][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 596.120891][ T1174] wait_for_completion+0x163/0x260 [ 596.126117][ T1174] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 596.133366][ T1174] ? apparmor_capable+0x1d8/0x460 [ 596.139378][ T1174] ? security_capable+0x8f/0xc0 [ 596.144417][ T1174] io_uring_setup+0x1495/0x29a0 [ 596.149608][ T1174] ? io_sq_thread+0xe00/0xe00 [ 596.154449][ T1174] ? io_issue_sqe+0x5bb0/0x5bb0 [ 596.159413][ T1174] ? io_wake_function+0x2e0/0x2e0 [ 596.164740][ T1174] ? check_preemption_disabled+0x50/0x130 [ 596.170654][ T1174] ? syscall_enter_from_user_mode+0x20/0x290 [ 596.176823][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 596.182741][ T1174] do_syscall_64+0x2d/0x70 [ 596.187486][ T1174] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 596.193712][ T1174] RIP: 0033:0x440299 [ 596.198189][ T1174] Code: Bad RIP value. [ 596.202288][ T1174] RSP: 002b:00007ffeba8a7238 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 596.211097][ T1174] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 596.219475][ T1174] RDX: 0000000000400b40 RSI: 0000000020000100 RDI: 0000000000004d85 [ 596.227553][ T1174] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 596.235837][ T1174] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 596.244179][ T1174] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 596.253236][ T1174] INFO: task io_uring-sq:6859 blocked for more than 143 seconds. [ 596.261682][ T1174] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.269507][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 596.279462][ T1174] task:io_uring-sq state:D stack:31200 pid: 6859 ppid: 2 flags:0x00004000 [ 596.289041][ T1174] Call Trace: [ 596.292512][ T1174] __schedule+0xea9/0x2230 [ 596.297029][ T1174] ? io_schedule_timeout+0x140/0x140 [ 596.302511][ T1174] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.308570][ T1174] schedule+0xd0/0x2a0 [ 596.312661][ T1174] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 596.318623][ T1174] schedule_preempt_disabled+0xf/0x20 [ 596.324223][ T1174] kthread+0x2ac/0x4a0 [ 596.328486][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 596.333790][ T1174] ret_from_fork+0x1f/0x30 [ 596.338318][ T1174] [ 596.338318][ T1174] Showing all locks held in the system: [ 596.346369][ T1174] 1 lock held by khungtaskd/1174: [ 596.351704][ T1174] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 596.361843][ T1174] 1 lock held by in:imklog/6743: [ 596.366981][ T1174] #0: ffff8880a5c3fd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 596.376777][ T1174] [ 596.379202][ T1174] ============================================= [ 596.379202][ T1174] [ 596.388272][ T1174] NMI backtrace for cpu 1 [ 596.392953][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.402496][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.412706][ T1174] Call Trace: [ 596.416084][ T1174] dump_stack+0x198/0x1fd [ 596.420467][ T1174] nmi_cpu_backtrace.cold+0x44/0xd7 [ 596.425717][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.431347][ T1174] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 596.437425][ T1174] watchdog+0xd89/0xf30 [ 596.441585][ T1174] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.447346][ T1174] kthread+0x3b5/0x4a0 [ 596.451905][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 596.457752][ T1174] ret_from_fork+0x1f/0x30 [ 596.462450][ T1174] Sending NMI from CPU 1 to CPUs 0: [ 596.468279][ C0] NMI backtrace for cpu 0 [ 596.468287][ C0] CPU: 0 PID: 3905 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.468294][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.468299][ C0] RIP: 0010:mark_held_locks+0xba/0xe0 [ 596.468317][ C0] Code: 83 da ff a8 04 74 0c 4c 89 e7 e8 51 e8 ff ff 85 c0 74 12 83 c3 01 41 39 9c 24 08 09 00 00 7f a9 b8 01 00 00 00 48 83 c4 08 5b <5d> 41 5c 41 5d 41 5e c3 e8 c9 4e 5b 00 e9 6d ff ff ff 48 89 34 24 [ 596.468321][ C0] RSP: 0018:ffffc90000effef0 EFLAGS: 00000086 [ 596.468330][ C0] RAX: 0000000000000001 RBX: ffff88809340c4c0 RCX: 1ffffffff1578f39 [ 596.468336][ C0] RDX: 1ffff110126819b9 RSI: 0000000000000006 RDI: ffff88809340cdc8 [ 596.468342][ C0] RBP: 0000000000000006 R08: 0000000000000000 R09: 0000000000000001 [ 596.468347][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809340c4c0 [ 596.468353][ C0] R13: dffffc0000000000 R14: ffff88809340cdd0 R15: 0000000000000000 [ 596.468359][ C0] FS: 00007f12447a28c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 596.468364][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 596.468369][ C0] CR2: 00007f1241b46000 CR3: 00000000934eb000 CR4: 00000000001506f0 [ 596.468374][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 596.468380][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 596.468382][ C0] Call Trace: [ 596.468387][ C0] lockdep_hardirqs_on_prepare+0x354/0x530 [ 596.468391][ C0] syscall_exit_to_user_mode+0x8d/0x2e0 [ 596.468395][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 596.468399][ C0] RIP: 0033:0x7f1243a5e687 [ 596.468410][ C0] Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 [ 596.468414][ C0] RSP: 002b:00007ffc4fe275d8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 596.468424][ C0] RAX: fffffffffffffffe RBX: 00007ffc4fe2a4f0 RCX: 00007f1243a5e687 [ 596.468429][ C0] RDX: 00007f12444cfa00 RSI: 00000000000001ed RDI: 000055ed8609f8a0 [ 596.468435][ C0] RBP: 00007ffc4fe27610 R08: 0000000000000000 R09: 0000000000000000 [ 596.468441][ C0] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 596.468447][ C0] R13: 0000000000000000 R14: 00007ffc4fe2a4f0 R15: 00007ffc4fe27b00 [ 596.470007][ T1174] Kernel panic - not syncing: hung_task: blocked tasks [ 596.706805][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 596.716338][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.726387][ T1174] Call Trace: [ 596.729765][ T1174] dump_stack+0x198/0x1fd [ 596.734147][ T1174] panic+0x347/0x7c0 [ 596.738039][ T1174] ? __warn_printk+0xf3/0xf3 [ 596.742676][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.748304][ T1174] ? preempt_schedule_thunk+0x16/0x18 [ 596.753669][ T1174] ? watchdog.cold+0x22d/0x24b [ 596.758429][ T1174] ? watchdog+0xc59/0xf30 [ 596.762814][ T1174] watchdog.cold+0x23e/0x24b [ 596.767498][ T1174] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.773345][ T1174] kthread+0x3b5/0x4a0 [ 596.777540][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 596.782791][ T1174] ret_from_fork+0x1f/0x30 [ 596.789013][ T1174] Kernel Offset: disabled [ 596.793535][ T1174] Rebooting in 86400 seconds..