[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 616.216381][ T1169] INFO: task syz-executor557:6844 blocked for more than 143 seconds.
[ 616.224595][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
[ 616.232047][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 616.240811][ T1169] task:syz-executor557 state:D stack:28104 pid: 6844 ppid: 6838 flags:0x00004000
[ 616.250143][ T1169] Call Trace:
[ 616.253553][ T1169] __schedule+0xea9/0x2230
[ 616.258058][ T1169] ? io_schedule_timeout+0x140/0x140
[ 616.263370][ T1169] schedule+0xd0/0x2a0
[ 616.268404][ T1169] schedule_timeout+0x1d8/0x250
[ 616.273268][ T1169] ? usleep_range+0x170/0x170
[ 616.279144][ T1169] ? lock_downgrade+0x830/0x830
[ 616.283987][ T1169] ? do_raw_spin_lock+0x120/0x2b0
[ 616.289770][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80
[ 616.294979][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530
[ 616.301705][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80
[ 616.307422][ T1169] wait_for_completion+0x163/0x260
[ 616.312544][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530
[ 616.319304][ T1169] ? wait_for_completion_interruptible+0x2e0/0x2e0
[ 616.325798][ T1169] ? _raw_spin_unlock_irqrestore+0x5c/0x90
[ 616.332441][ T1169] ? __kthread_bind_mask+0xa1/0xc0
[ 616.338119][ T1169] io_uring_setup+0x1495/0x29a0
[ 616.342986][ T1169] ? io_sq_thread+0xe00/0xe00
[ 616.348378][ T1169] ? io_issue_sqe+0x5bb0/0x5bb0
[ 616.353217][ T1169] ? io_wake_function+0x2e0/0x2e0
[ 616.358977][ T1169] ? check_preemption_disabled+0x50/0x130
[ 616.364684][ T1169] ? syscall_enter_from_user_mode+0x20/0x290
[ 616.371413][ T1169] ? lockdep_hardirqs_on+0x53/0x100
[ 616.377152][ T1169] do_syscall_64+0x2d/0x70
[ 616.381589][ T1169] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 616.388249][ T1169] RIP: 0033:0x440229
[ 616.392126][ T1169] Code: Bad RIP value.
[ 616.396173][ T1169] RSP: 002b:00007ffea62acfa8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
[ 616.405601][ T1169] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229
[ 616.414867][ T1169] RDX: 0000000000400ad0 RSI: 0000000020000040 RDI: 0000000000007ca3
[ 616.423309][ T1169] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
[ 616.431760][ T1169] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30
[ 616.440201][ T1169] R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000
[ 616.448731][ T1169] INFO: task io_uring-sq:6845 blocked for more than 143 seconds.
[ 616.456978][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
[ 616.463982][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 616.473401][ T1169] task:io_uring-sq state:D stack:31200 pid: 6845 ppid: 2 flags:0x00004000
[ 616.483084][ T1169] Call Trace:
[ 616.486954][ T1169] __schedule+0xea9/0x2230
[ 616.491382][ T1169] ? io_schedule_timeout+0x140/0x140
[ 616.497427][ T1169] ? _raw_spin_unlock_irqrestore+0x6f/0x90
[ 616.503235][ T1169] schedule+0xd0/0x2a0
[ 616.507995][ T1169] ? __do_sys_io_uring_enter+0x1940/0x1940
[ 616.513796][ T1169] schedule_preempt_disabled+0xf/0x20
[ 616.519917][ T1169] kthread+0x2ac/0x4a0
[ 616.523973][ T1169] ? __kthread_bind_mask+0xc0/0xc0
[ 616.529861][ T1169] ret_from_fork+0x1f/0x30
[ 616.534289][ T1169]
[ 616.534289][ T1169] Showing all locks held in the system:
[ 616.543157][ T1169] 1 lock held by khungtaskd/1169:
[ 616.548633][ T1169] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260
[ 616.559162][ T1169] 1 lock held by in:imklog/6557:
[ 616.564084][ T1169] #0: ffff8880a164ddb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100
[ 616.573993][ T1169]
[ 616.576807][ T1169] =============================================
[ 616.576807][ T1169]
[ 616.585202][ T1169] NMI backtrace for cpu 1
[ 616.589605][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
[ 616.599047][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 616.609084][ T1169] Call Trace:
[ 616.612435][ T1169] dump_stack+0x198/0x1fd
[ 616.616751][ T1169] nmi_cpu_backtrace.cold+0x44/0xd7
[ 616.621962][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38
[ 616.627590][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223
[ 616.633653][ T1169] watchdog+0xd89/0xf30
[ 616.637808][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0
[ 616.643517][ T1169] kthread+0x3b5/0x4a0
[ 616.647575][ T1169] ? __kthread_bind_mask+0xc0/0xc0
[ 616.652666][ T1169] ret_from_fork+0x1f/0x30
[ 616.657245][ T1169] Sending NMI from CPU 1 to CPUs 0:
[ 616.663282][ C0] NMI backtrace for cpu 0
[ 616.663290][ C0] CPU: 0 PID: 6558 Comm: rs:main Q:Reg Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
[ 616.663297][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 616.663302][ C0] RIP: 0010:ext4_block_write_begin+0x5f0/0x1410
[ 616.663314][ C0] Code: 0f 85 c3 0c 00 00 4d 8b 24 24 31 ff 49 c1 ec 05 41 83 e4 01 44 89 e6 e8 4e bc 6f ff 45 84 e4 0f 85 ca 07 00 00 e8 00 c0 6f ff <48> 8b 54 24 20 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02
[ 616.663318][ C0] RSP: 0018:ffffc90009f27850 EFLAGS: 00000293
[ 616.663328][ C0] RAX: 0000000000000000 RBX: 0000000000001000 RCX: ffffffff8205220d
[ 616.663333][ C0] RDX: ffff88809e8fc3c0 RSI: ffffffff82052300 RDI: 0000000000000001
[ 616.663339][ C0] RBP: ffffea0002331780 R08: 0000000000000000 R09: ffff88808583c217
[ 616.663345][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
[ 616.663351][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001000
[ 616.663357][ C0] FS: 00007fd41984a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[ 616.663362][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 616.663368][ C0] CR2: 00007fd343082000 CR3: 00000000a38a1000 CR4: 00000000001506f0
[ 616.663373][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 616.663379][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 616.663383][ C0] Call Trace:
[ 616.663387][ C0] ? ext4_block_write_begin+0x1410/0x1410
[ 616.663392][ C0] ? ext4_dax_writepages+0xb70/0xb70
[ 616.663396][ C0] ? lock_is_held_type+0xbb/0xf0
[ 616.663400][ C0] ext4_da_write_begin+0x3e4/0x11d0
[ 616.663405][ C0] ? ext4_write_begin+0x1510/0x1510
[ 616.663409][ C0] ? compat_import_iovec+0x3d0/0x3d0
[ 616.663414][ C0] ? rcu_read_lock_sched_held+0x3a/0xb0
[ 616.663418][ C0] generic_perform_write+0x20a/0x4f0
[ 616.663423][ C0] ? generic_file_readonly_mmap+0x1b0/0x1b0
[ 616.663427][ C0] ? down_write_killable+0x170/0x170
[ 616.663432][ C0] ext4_buffered_write_iter+0x235/0x4a0
[ 616.663436][ C0] ext4_file_write_iter+0x1f0/0x13f0
[ 616.663440][ C0] ? aa_file_perm+0x5e2/0x1100
[ 616.663445][ C0] ? ext4_buffered_write_iter+0x4a0/0x4a0
[ 616.663450][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530
[ 616.663454][ C0] ? aa_path_link+0x2f0/0x2f0
[ 616.663459][ C0] new_sync_write+0x422/0x650
[ 616.663463][ C0] ? new_sync_read+0x6e0/0x6e0
[ 616.663468][ C0] ? lock_downgrade+0x830/0x830
[ 616.663472][ C0] ? lock_is_held_type+0xbb/0xf0
[ 616.663477][ C0] ? __sb_start_write+0x1d5/0x470
[ 616.663481][ C0] vfs_write+0x5ad/0x730
[ 616.663485][ C0] ksys_write+0x12d/0x250
[ 616.663490][ C0] ? __ia32_sys_read+0xb0/0xb0
[ 616.663495][ C0] ? syscall_enter_from_user_mode+0x20/0x290
[ 616.663499][ C0] ? lockdep_hardirqs_on+0x53/0x100
[ 616.663504][ C0] do_syscall_64+0x2d/0x70
[ 616.663509][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 616.663513][ C0] RIP: 0033:0x7fd41c28e1cd
[ 616.663525][ C0] Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
[ 616.663530][ C0] RSP: 002b:00007fd419849590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
[ 616.663540][ C0] RAX: ffffffffffffffda RBX: 00007fd40c0071d0 RCX: 00007fd41c28e1cd
[ 616.663547][ C0] RDX: 000000000000044d RSI: 00007fd40c0071d0 RDI: 0000000000000006
[ 616.663553][ C0] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 616.663559][ C0] R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd40c006f50
[ 616.663573][ C0] R13: 00007fd4198495b0 R14: 000055a376fb5360 R15: 000000000000044d
[ 616.663592][ T1169] Kernel panic - not syncing: hung_task: blocked tasks
[ 617.024682][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
[ 617.034104][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 617.044136][ T1169] Call Trace:
[ 617.047409][ T1169] dump_stack+0x198/0x1fd
[ 617.051766][ T1169] panic+0x347/0x7c0
[ 617.055642][ T1169] ? __warn_printk+0xf3/0xf3
[ 617.060221][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38
[ 617.065831][ T1169] ? preempt_schedule_thunk+0x16/0x18
[ 617.071185][ T1169] ? watchdog.cold+0x22d/0x24b
[ 617.075936][ T1169] ? watchdog+0xc59/0xf30
[ 617.080243][ T1169] watchdog.cold+0x23e/0x24b
[ 617.084809][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0
[ 617.090521][ T1169] kthread+0x3b5/0x4a0
[ 617.094575][ T1169] ? __kthread_bind_mask+0xc0/0xc0
[ 617.099664][ T1169] ret_from_fork+0x1f/0x30
[ 617.105230][ T1169] Kernel Offset: disabled
[ 617.109551][ T1169] Rebooting in 86400 seconds..