[ 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... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.182860][ T1169] INFO: task syz-executor455:6861 blocked for more than 143 seconds. [ 616.191058][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.198471][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.207239][ T1169] task:syz-executor455 state:D stack:28104 pid: 6861 ppid: 6855 flags:0x00004000 [ 616.217343][ T1169] Call Trace: [ 616.220767][ T1169] __schedule+0xea9/0x2230 [ 616.226181][ T1169] ? io_schedule_timeout+0x140/0x140 [ 616.231463][ T1169] schedule+0xd0/0x2a0 [ 616.236250][ T1169] schedule_timeout+0x1d8/0x250 [ 616.241090][ T1169] ? usleep_range+0x170/0x170 [ 616.246552][ T1169] ? lock_downgrade+0x830/0x830 [ 616.251391][ T1169] ? do_raw_spin_lock+0x120/0x2b0 [ 616.257137][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.262325][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.268935][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.274536][ T1169] wait_for_completion+0x163/0x260 [ 616.279635][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.286287][ T1169] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.293232][ T1169] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 616.299091][ T1169] ? __kthread_bind_mask+0xa1/0xc0 [ 616.304902][ T1169] io_uring_setup+0x1495/0x29a0 [ 616.309759][ T1169] ? io_sq_thread+0xe00/0xe00 [ 616.315196][ T1169] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.320050][ T1169] ? io_wake_function+0x2e0/0x2e0 [ 616.325751][ T1169] ? check_preemption_disabled+0x50/0x130 [ 616.331463][ T1169] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.338845][ T1169] ? lockdep_hardirqs_on+0x53/0x100 [ 616.344500][ T1169] do_syscall_64+0x2d/0x70 [ 616.348910][ T1169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.355465][ T1169] RIP: 0033:0x440229 [ 616.359342][ T1169] Code: Bad RIP value. [ 616.364038][ T1169] RSP: 002b:00007ffe81fac3a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.372437][ T1169] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229 [ 616.381152][ T1169] RDX: 0000000000400ad0 RSI: 0000000020000140 RDI: 00000000000062c6 [ 616.389537][ T1169] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.397928][ T1169] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30 [ 616.406329][ T1169] R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 [ 616.414840][ T1169] INFO: task io_uring-sq:6862 blocked for more than 143 seconds. [ 616.422539][ T1169] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.430385][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.439474][ T1169] task:io_uring-sq state:D stack:31200 pid: 6862 ppid: 2 flags:0x00004000 [ 616.449140][ T1169] Call Trace: [ 616.452436][ T1169] __schedule+0xea9/0x2230 [ 616.457580][ T1169] ? io_schedule_timeout+0x140/0x140 [ 616.463287][ T1169] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.469079][ T1169] schedule+0xd0/0x2a0 [ 616.473848][ T1169] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.479645][ T1169] schedule_preempt_disabled+0xf/0x20 [ 616.485656][ T1169] kthread+0x2ac/0x4a0 [ 616.489738][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 616.495630][ T1169] ret_from_fork+0x1f/0x30 [ 616.500070][ T1169] [ 616.500070][ T1169] Showing all locks held in the system: [ 616.508998][ T1169] 1 lock held by khungtaskd/1169: [ 616.514647][ T1169] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.524939][ T1169] 1 lock held by in:imklog/6537: [ 616.529858][ T1169] #0: ffff8880a5e390f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.539710][ T1169] [ 616.542038][ T1169] ============================================= [ 616.542038][ T1169] [ 616.551168][ T1169] NMI backtrace for cpu 0 [ 616.555553][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.565001][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.575030][ T1169] Call Trace: [ 616.578394][ T1169] dump_stack+0x198/0x1fd [ 616.582708][ T1169] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.587929][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.593545][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.599675][ T1169] watchdog+0xd89/0xf30 [ 616.603814][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.609510][ T1169] kthread+0x3b5/0x4a0 [ 616.613561][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 616.618649][ T1169] ret_from_fork+0x1f/0x30 [ 616.623252][ T1169] Sending NMI from CPU 0 to CPUs 1: [ 616.629165][ C1] NMI backtrace for cpu 1 [ 616.629173][ C1] CPU: 1 PID: 6538 Comm: rs:main Q:Reg Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.629179][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.629184][ C1] RIP: 0010:lock_is_held_type+0x5b/0xf0 [ 616.629197][ C1] Code: 89 fc 31 db e8 f6 23 60 f9 83 85 0c 09 00 00 01 49 89 c7 8b 85 08 09 00 00 85 c0 7f 0d eb 7d 83 c3 01 3b 9d 08 09 00 00 7d 72 <48> 63 c3 4c 89 e6 48 8d 04 80 4d 8d 74 c5 00 4c 89 f7 e8 4e fc ff [ 616.629201][ C1] RSP: 0018:ffffc90009fd7910 EFLAGS: 00000093 [ 616.629210][ C1] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffffffff130b121 [ 616.629215][ C1] RDX: dffffc0000000000 RSI: ffffffff89c67440 RDI: ffff8880a294aa50 [ 616.629220][ C1] RBP: ffff8880a294a140 R08: 0000000000000000 R09: ffffffff8abcb60f [ 616.629226][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89c67440 [ 616.629231][ C1] R13: ffff8880a294aa50 R14: ffff8880a294aa50 R15: 0000000000000286 [ 616.629237][ C1] FS: 00007ff6ed169700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 616.629242][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.629247][ C1] CR2: 00007f93960e0028 CR3: 0000000092391000 CR4: 00000000001506e0 [ 616.629253][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.629259][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.629261][ C1] Call Trace: [ 616.629265][ C1] rcu_read_lock_sched_held+0x3a/0xb0 [ 616.629269][ C1] __mark_inode_dirty+0xe05/0x1300 [ 616.629273][ C1] generic_write_end+0x316/0x4f0 [ 616.629277][ C1] ext4_da_write_end+0x211/0xbb0 [ 616.629281][ C1] generic_perform_write+0x2c0/0x4f0 [ 616.629285][ C1] ? generic_file_readonly_mmap+0x1b0/0x1b0 [ 616.629289][ C1] ? down_write_killable+0x170/0x170 [ 616.629294][ C1] ext4_buffered_write_iter+0x235/0x4a0 [ 616.629298][ C1] ext4_file_write_iter+0x1f0/0x13f0 [ 616.629301][ C1] ? aa_file_perm+0x5e2/0x1100 [ 616.629306][ C1] ? ext4_buffered_write_iter+0x4a0/0x4a0 [ 616.629310][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 616.629314][ C1] ? aa_path_link+0x2f0/0x2f0 [ 616.629317][ C1] new_sync_write+0x422/0x650 [ 616.629321][ C1] ? new_sync_read+0x6e0/0x6e0 [ 616.629325][ C1] ? lock_downgrade+0x830/0x830 [ 616.629329][ C1] ? lock_is_held_type+0xbb/0xf0 [ 616.629333][ C1] ? __sb_start_write+0x1d5/0x470 [ 616.629336][ C1] vfs_write+0x5ad/0x730 [ 616.629340][ C1] ksys_write+0x12d/0x250 [ 616.629343][ C1] ? __ia32_sys_read+0xb0/0xb0 [ 616.629348][ C1] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.629352][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 616.629355][ C1] do_syscall_64+0x2d/0x70 [ 616.629359][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.629363][ C1] RIP: 0033:0x7ff6efbad1cd [ 616.629374][ C1] 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 [ 616.629378][ C1] RSP: 002b:00007ff6ed168590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 616.629388][ C1] RAX: ffffffffffffffda RBX: 00007ff6e4026010 RCX: 00007ff6efbad1cd [ 616.629393][ C1] RDX: 000000000000044d RSI: 00007ff6e4026010 RDI: 0000000000000008 [ 616.629399][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 616.629404][ C1] R10: 0000000000000000 R11: 0000000000000293 R12: 00007ff6e4025d90 [ 616.629410][ C1] R13: 00007ff6ed1685b0 R14: 000055b6d78a6440 R15: 000000000000044d [ 616.629499][ T1169] Kernel panic - not syncing: hung_task: blocked tasks [ 616.973089][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.982510][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.992551][ T1169] Call Trace: [ 616.995842][ T1169] dump_stack+0x198/0x1fd [ 617.000199][ T1169] panic+0x347/0x7c0 [ 617.004086][ T1169] ? __warn_printk+0xf3/0xf3 [ 617.008655][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.014274][ T1169] ? preempt_schedule_thunk+0x16/0x18 [ 617.019622][ T1169] ? watchdog.cold+0x22d/0x24b [ 617.024358][ T1169] ? watchdog+0xc59/0xf30 [ 617.028664][ T1169] watchdog.cold+0x23e/0x24b [ 617.033231][ T1169] ? trace_sched_process_hang+0x2e0/0x2e0 [ 617.038925][ T1169] kthread+0x3b5/0x4a0 [ 617.042972][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 617.048057][ T1169] ret_from_fork+0x1f/0x30 [ 617.053876][ T1169] Kernel Offset: disabled [ 617.058216][ T1169] Rebooting in 86400 seconds..