[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.360762][ T1171] INFO: task syz-executor487:6864 blocked for more than 143 seconds. [ 616.369005][ T1171] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 616.377929][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.387234][ T1171] task:syz-executor487 state:D stack:28104 pid: 6864 ppid: 6858 flags:0x00004000 [ 616.397195][ T1171] Call Trace: [ 616.401260][ T1171] __schedule+0xea9/0x2230 [ 616.405693][ T1171] ? io_schedule_timeout+0x140/0x140 [ 616.411914][ T1171] schedule+0xd0/0x2a0 [ 616.415994][ T1171] schedule_timeout+0x1d8/0x250 [ 616.421740][ T1171] ? usleep_range+0x170/0x170 [ 616.426496][ T1171] ? lock_downgrade+0x830/0x830 [ 616.432265][ T1171] ? do_raw_spin_lock+0x120/0x2b0 [ 616.437293][ T1171] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.443402][ T1171] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.449412][ T1171] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.455502][ T1171] wait_for_completion+0x163/0x260 [ 616.461154][ T1171] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.467143][ T1171] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.474536][ T1171] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 616.480446][ T1171] ? __kthread_bind_mask+0xa1/0xc0 [ 616.486737][ T1171] io_uring_setup+0x1495/0x29a0 [ 616.492820][ T1171] ? io_connect+0x510/0x510 [ 616.497342][ T1171] ? io_sq_thread+0xe00/0xe00 [ 616.502812][ T1171] ? io_wake_function+0x2e0/0x2e0 [ 616.507850][ T1171] ? check_preemption_disabled+0x50/0x130 [ 616.514428][ T1171] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.520432][ T1171] ? lockdep_hardirqs_on+0x53/0x100 [ 616.526508][ T1171] do_syscall_64+0x2d/0x70 [ 616.531499][ T1171] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.537424][ T1171] RIP: 0033:0x440229 [ 616.542258][ T1171] Code: Bad RIP value. [ 616.546340][ T1171] RSP: 002b:00007ffc632a0cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.555647][ T1171] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229 [ 616.564237][ T1171] RDX: 0000000000400ad0 RSI: 0000000020000040 RDI: 0000000000002e4c [ 616.572817][ T1171] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.581405][ T1171] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30 [ 616.589400][ T1171] R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 [ 616.598329][ T1171] INFO: task io_uring-sq:6865 blocked for more than 143 seconds. [ 616.606909][ T1171] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 616.614499][ T1171] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.623848][ T1171] task:io_uring-sq state:D stack:31200 pid: 6865 ppid: 2 flags:0x00004000 [ 616.633799][ T1171] Call Trace: [ 616.637097][ T1171] __schedule+0xea9/0x2230 [ 616.642346][ T1171] ? io_schedule_timeout+0x140/0x140 [ 616.647664][ T1171] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.654441][ T1171] schedule+0xd0/0x2a0 [ 616.658514][ T1171] ? __do_sys_io_uring_enter+0x1b00/0x1b00 [ 616.665182][ T1171] schedule_preempt_disabled+0xf/0x20 [ 616.671121][ T1171] kthread+0x2ac/0x4a0 [ 616.675189][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 616.680395][ T1171] ret_from_fork+0x1f/0x30 [ 616.685986][ T1171] [ 616.685986][ T1171] Showing all locks held in the system: [ 616.695364][ T1171] 1 lock held by khungtaskd/1171: [ 616.700395][ T1171] #0: ffffffff89c67980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.711766][ T1171] 1 lock held by in:imklog/6550: [ 616.716693][ T1171] #0: ffff8880a8b06930 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.726930][ T1171] [ 616.729271][ T1171] ============================================= [ 616.729271][ T1171] [ 616.739519][ T1171] NMI backtrace for cpu 0 [ 616.744036][ T1171] CPU: 0 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 616.753494][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.763557][ T1171] Call Trace: [ 616.766948][ T1171] dump_stack+0x198/0x1fd [ 616.771360][ T1171] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.776618][ T1171] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.782278][ T1171] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.788309][ T1171] watchdog+0xd89/0xf30 [ 616.792474][ T1171] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.798229][ T1171] kthread+0x3b5/0x4a0 [ 616.802297][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 616.807408][ T1171] ret_from_fork+0x1f/0x30 [ 616.811986][ T1171] Sending NMI from CPU 0 to CPUs 1: [ 616.817613][ C1] NMI backtrace for cpu 1 [ 616.817621][ C1] CPU: 1 PID: 3908 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 616.817629][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.817634][ C1] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xd/0x20 [ 616.817647][ C1] Code: 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 cc fe ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 ae fe ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c [ 616.817651][ C1] RSP: 0018:ffffc90001137d90 EFLAGS: 00000246 [ 616.817661][ C1] RAX: 0000000080000001 RBX: ffff888094fb1c00 RCX: ffffffff81754a43 [ 616.817667][ C1] RDX: 0000000080000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 616.817673][ C1] RBP: 0000000080000000 R08: 0000000000000001 R09: 0000000000000001 [ 616.817679][ C1] R10: 000000007fff0000 R11: 0000000000000000 R12: dffffc0000000000 [ 616.817685][ C1] R13: 000000007fff0000 R14: 000000007fff0000 R15: ffffc90001137e40 [ 616.817692][ C1] FS: 00007fe5f77568c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 616.817697][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.817703][ C1] CR2: 00007fe5f4afa008 CR3: 0000000093351000 CR4: 00000000001506e0 [ 616.817709][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.817715][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.817719][ C1] Call Trace: [ 616.817723][ C1] __seccomp_filter+0x173/0x1520 [ 616.817728][ C1] ? seccomp_notify_ioctl+0xd90/0xd90 [ 616.817733][ C1] ? security_file_permission+0x248/0x560 [ 616.817737][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.817742][ C1] __secure_computing+0xfc/0x360 [ 616.817747][ C1] syscall_enter_from_user_mode+0xb7/0x290 [ 616.817751][ C1] do_syscall_64+0xf/0x70 [ 616.817756][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.817760][ C1] RIP: 0033:0x7fe5f69eff17 [ 616.817772][ C1] 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 [ 616.817776][ C1] RSP: 002b:00007fffb83d7948 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 [ 616.817787][ C1] RAX: ffffffffffffffda RBX: 0000564158a9b1e0 RCX: 00007fe5f69eff17 [ 616.817792][ C1] RDX: 00007fffb83d7a00 RSI: 0000000000000000 RDI: 0000564158a9b1e0 [ 616.817798][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 616.817804][ C1] R10: 0000000000000069 R11: 0000000000000206 R12: 00007fffb83d7a00 [ 616.817810][ C1] R13: 0000000000000f44 R14: 00007fffb83da7f0 R15: 00007fffb83d7e00 [ 616.818224][ T1171] Kernel panic - not syncing: hung_task: blocked tasks [ 617.082170][ T1171] CPU: 0 PID: 1171 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 617.091613][ T1171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.101771][ T1171] Call Trace: [ 617.105074][ T1171] dump_stack+0x198/0x1fd [ 617.109478][ T1171] panic+0x347/0x7c0 [ 617.113383][ T1171] ? __warn_printk+0xf3/0xf3 [ 617.118000][ T1171] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.123644][ T1171] ? preempt_schedule_thunk+0x16/0x18 [ 617.129024][ T1171] ? watchdog.cold+0x22d/0x24b [ 617.133781][ T1171] ? watchdog+0xc59/0xf30 [ 617.138105][ T1171] watchdog.cold+0x23e/0x24b [ 617.142702][ T1171] ? trace_sched_process_hang+0x2e0/0x2e0 [ 617.148418][ T1171] kthread+0x3b5/0x4a0 [ 617.152491][ T1171] ? __kthread_bind_mask+0xc0/0xc0 [ 617.157594][ T1171] ret_from_fork+0x1f/0x30 [ 617.162835][ T1171] Kernel Offset: disabled [ 617.167169][ T1171] Rebooting in 86400 seconds..