[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ 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 '10.128.10.59' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 595.801957][ T1164] INFO: task syz-executor174:6866 blocked for more than 143 seconds. [ 595.810208][ T1164] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 595.817637][ T1164] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.826434][ T1164] task:syz-executor174 state:D stack:28104 pid: 6866 ppid: 6860 flags:0x00004000 [ 595.835728][ T1164] Call Trace: [ 595.839148][ T1164] __schedule+0xea9/0x2230 [ 595.843669][ T1164] ? io_schedule_timeout+0x140/0x140 [ 595.848961][ T1164] schedule+0xd0/0x2a0 [ 595.853085][ T1164] schedule_timeout+0x1d8/0x250 [ 595.857946][ T1164] ? usleep_range+0x170/0x170 [ 595.862745][ T1164] ? lock_downgrade+0x830/0x830 [ 595.867610][ T1164] ? do_raw_spin_lock+0x120/0x2b0 [ 595.872721][ T1164] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.877944][ T1164] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.885588][ T1164] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.890791][ T1164] wait_for_completion+0x163/0x260 [ 595.895959][ T1164] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.902045][ T1164] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 595.908553][ T1164] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 595.914410][ T1164] ? __kthread_bind_mask+0xa1/0xc0 [ 595.919542][ T1164] io_uring_setup+0x1495/0x29a0 [ 595.924491][ T1164] ? io_connect+0x510/0x510 [ 595.929006][ T1164] ? io_sq_thread+0xe00/0xe00 [ 595.933920][ T1164] ? io_wake_function+0x2e0/0x2e0 [ 595.938955][ T1164] ? check_preemption_disabled+0x50/0x130 [ 595.944762][ T1164] ? syscall_enter_from_user_mode+0x20/0x290 [ 595.950749][ T1164] ? lockdep_hardirqs_on+0x53/0x100 [ 595.956068][ T1164] do_syscall_64+0x2d/0x70 [ 595.960512][ T1164] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 595.966498][ T1164] RIP: 0033:0x440299 [ 595.970387][ T1164] Code: Bad RIP value. [ 595.974496][ T1164] RSP: 002b:00007ffc22bf79f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 595.983712][ T1164] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 595.991766][ T1164] RDX: 0000000000400b40 RSI: 0000000020000080 RDI: 0000000000006ad4 [ 595.999748][ T1164] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 596.007848][ T1164] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 596.015919][ T1164] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 596.024057][ T1164] INFO: task io_uring-sq:6867 blocked for more than 143 seconds. [ 596.031875][ T1164] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.038899][ T1164] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 596.047682][ T1164] task:io_uring-sq state:D stack:31200 pid: 6867 ppid: 2 flags:0x00004000 [ 596.056958][ T1164] Call Trace: [ 596.060264][ T1164] __schedule+0xea9/0x2230 [ 596.064788][ T1164] ? io_schedule_timeout+0x140/0x140 [ 596.070082][ T1164] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.075946][ T1164] schedule+0xd0/0x2a0 [ 596.080025][ T1164] ? __do_sys_io_uring_enter+0x1b00/0x1b00 [ 596.086069][ T1164] schedule_preempt_disabled+0xf/0x20 [ 596.091463][ T1164] kthread+0x2ac/0x4a0 [ 596.096122][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 596.101261][ T1164] ret_from_fork+0x1f/0x30 [ 596.105855][ T1164] [ 596.105855][ T1164] Showing all locks held in the system: [ 596.113673][ T1164] 1 lock held by khungtaskd/1164: [ 596.118692][ T1164] #0: ffffffff89c67980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 596.128644][ T1164] [ 596.130969][ T1164] ============================================= [ 596.130969][ T1164] [ 596.139421][ T1164] NMI backtrace for cpu 0 [ 596.143874][ T1164] CPU: 0 PID: 1164 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.153310][ T1164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.163348][ T1164] Call Trace: [ 596.166624][ T1164] dump_stack+0x198/0x1fd [ 596.170949][ T1164] nmi_cpu_backtrace.cold+0x44/0xd7 [ 596.176132][ T1164] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.181746][ T1164] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 596.187706][ T1164] watchdog+0xd89/0xf30 [ 596.191843][ T1164] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.197549][ T1164] kthread+0x3b5/0x4a0 [ 596.201596][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 596.206700][ T1164] ret_from_fork+0x1f/0x30 [ 596.211255][ T1164] Sending NMI from CPU 0 to CPUs 1: [ 596.217034][ C1] NMI backtrace for cpu 1 [ 596.217042][ C1] CPU: 1 PID: 3898 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.217049][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.217054][ C1] RIP: 0010:check_memory_region+0xcd/0x180 [ 596.217066][ C1] Code: 8d 50 08 eb 09 48 83 c0 01 48 39 d0 74 7a 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e <48> 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 80 38 00 74 f2 eb d4 41 [ 596.217071][ C1] RSP: 0018:ffffc90000f77a88 EFLAGS: 00000002 [ 596.217081][ C1] RAX: fffffbfff18d573c RBX: fffffbfff18d573d RCX: ffffffff8159e9fc [ 596.217087][ C1] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8c6ab9e0 [ 596.217093][ C1] RBP: fffffbfff18d573c R08: 0000000000000000 R09: ffffffff8c6ab9e7 [ 596.217099][ C1] R10: fffffbfff18d573c R11: 0000000000000000 R12: 0000000000000008 [ 596.217105][ C1] R13: ffff888093bf8c1a R14: ffff888093bf8bf8 R15: ffff888093bf8bd0 [ 596.217111][ C1] FS: 00007f111719e8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 596.217116][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 596.217122][ C1] CR2: 00007f1114541000 CR3: 000000009368d000 CR4: 00000000001506e0 [ 596.217128][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 596.217134][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 596.217138][ C1] Call Trace: [ 596.217142][ C1] mark_lock+0xbc/0x1710 [ 596.217146][ C1] ? lock_acquire+0x1f3/0xae0 [ 596.217151][ C1] __lock_acquire+0x88e/0x5570 [ 596.217155][ C1] ? rwsem_optimistic_spin+0x3a2/0x560 [ 596.217160][ C1] ? lock_is_held_type+0xbb/0xf0 [ 596.217164][ C1] ? aa_file_perm+0x5b8/0x1100 [ 596.217169][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 596.217173][ C1] ? __mutex_lock+0x626/0x10e0 [ 596.217178][ C1] lock_acquire+0x1f3/0xae0 [ 596.217182][ C1] ? devkmsg_read+0x1d0/0xa50 [ 596.217186][ C1] ? lock_release+0x8f0/0x8f0 [ 596.217190][ C1] ? mark_lock+0xbc/0x1710 [ 596.217194][ C1] ? aa_path_link+0x2f0/0x2f0 [ 596.217199][ C1] ? check_preemption_disabled+0x50/0x130 [ 596.217203][ C1] ? devkmsg_read+0x6ef/0xa50 [ 596.217208][ C1] _raw_spin_lock+0x2a/0x40 [ 596.217212][ C1] ? devkmsg_read+0x1d0/0xa50 [ 596.217216][ C1] devkmsg_read+0x1d0/0xa50 [ 596.217221][ C1] ? wake_up_klogd_work_func+0xf0/0xf0 [ 596.217225][ C1] ? security_file_permission+0x248/0x560 [ 596.217230][ C1] ? wake_up_klogd_work_func+0xf0/0xf0 [ 596.217234][ C1] vfs_read+0x1df/0x5a0 [ 596.217239][ C1] ksys_read+0x12d/0x250 [ 596.217243][ C1] ? vfs_write+0x730/0x730 [ 596.217247][ C1] ? __secure_computing+0x104/0x360 [ 596.217251][ C1] do_syscall_64+0x2d/0x70 [ 596.217256][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 596.217260][ C1] RIP: 0033:0x7f111672e210 [ 596.217272][ C1] Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 [ 596.217276][ C1] RSP: 002b:00007fff926b28f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 596.217286][ C1] RAX: ffffffffffffffda RBX: 00007fff926b5370 RCX: 00007f111672e210 [ 596.217292][ C1] RDX: 0000000000002000 RSI: 00007fff926b3170 RDI: 0000000000000009 [ 596.217298][ C1] RBP: 0000000000000000 R08: 0000000000000008 R09: 00007fff926f80f0 [ 596.217304][ C1] R10: 0000000000011db0 R11: 0000000000000246 R12: 00007fff926b3170 [ 596.217310][ C1] R13: 00007fff926b52c8 R14: 000056138774a958 R15: 0005ae621e1f9d6d [ 596.217594][ T1164] Kernel panic - not syncing: hung_task: blocked tasks [ 596.565389][ T1164] CPU: 0 PID: 1164 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.574834][ T1164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.584871][ T1164] Call Trace: [ 596.588147][ T1164] dump_stack+0x198/0x1fd [ 596.592479][ T1164] panic+0x347/0x7c0 [ 596.596359][ T1164] ? __warn_printk+0xf3/0xf3 [ 596.600932][ T1164] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.606549][ T1164] ? preempt_schedule_thunk+0x16/0x18 [ 596.611912][ T1164] ? watchdog.cold+0x22d/0x24b [ 596.616677][ T1164] ? watchdog+0xc59/0xf30 [ 596.620986][ T1164] watchdog.cold+0x23e/0x24b [ 596.625560][ T1164] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.631264][ T1164] kthread+0x3b5/0x4a0 [ 596.635312][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 596.640405][ T1164] ret_from_fork+0x1f/0x30 [ 596.645924][ T1164] Kernel Offset: disabled [ 596.650255][ T1164] Rebooting in 86400 seconds..