[ 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 '10.128.0.63' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 595.908659][ T1172] INFO: task syz-executor415:6870 blocked for more than 143 seconds. [ 595.917043][ T1172] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 595.925064][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 595.934814][ T1172] task:syz-executor415 state:D stack:28104 pid: 6870 ppid: 6864 flags:0x00004000 [ 595.944158][ T1172] Call Trace: [ 595.947616][ T1172] __schedule+0xea9/0x2230 [ 595.952089][ T1172] ? io_schedule_timeout+0x140/0x140 [ 595.957389][ T1172] schedule+0xd0/0x2a0 [ 595.961511][ T1172] schedule_timeout+0x1d8/0x250 [ 595.966365][ T1172] ? usleep_range+0x170/0x170 [ 595.971166][ T1172] ? lock_downgrade+0x830/0x830 [ 595.976077][ T1172] ? do_raw_spin_lock+0x120/0x2b0 [ 595.981153][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.986355][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 595.992456][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 595.997667][ T1172] wait_for_completion+0x163/0x260 [ 596.002830][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 596.008881][ T1172] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 596.015410][ T1172] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 596.021356][ T1172] ? __kthread_bind_mask+0xa1/0xc0 [ 596.026615][ T1172] io_uring_setup+0x1495/0x29a0 [ 596.031541][ T1172] ? io_connect+0x510/0x510 [ 596.036044][ T1172] ? io_sq_thread+0xe00/0xe00 [ 596.040762][ T1172] ? io_wake_function+0x2e0/0x2e0 [ 596.045800][ T1172] ? check_preemption_disabled+0x50/0x130 [ 596.051591][ T1172] ? syscall_enter_from_user_mode+0x20/0x290 [ 596.057584][ T1172] ? lockdep_hardirqs_on+0x53/0x100 [ 596.063814][ T1172] do_syscall_64+0x2d/0x70 [ 596.068230][ T1172] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 596.074200][ T1172] RIP: 0033:0x440299 [ 596.078096][ T1172] Code: Bad RIP value. [ 596.082206][ T1172] RSP: 002b:00007ffd389bfd58 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 596.090736][ T1172] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 596.098813][ T1172] RDX: 0000000000400b40 RSI: 0000000020000100 RDI: 0000000000003ffe [ 596.106892][ T1172] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 596.114977][ T1172] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 596.123024][ T1172] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 596.131104][ T1172] INFO: task io_uring-sq:6871 blocked for more than 143 seconds. [ 596.138941][ T1172] Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.145952][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 596.154708][ T1172] task:io_uring-sq state:D stack:31200 pid: 6871 ppid: 2 flags:0x00004000 [ 596.164000][ T1172] Call Trace: [ 596.167298][ T1172] __schedule+0xea9/0x2230 [ 596.171778][ T1172] ? io_schedule_timeout+0x140/0x140 [ 596.177084][ T1172] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.182953][ T1172] schedule+0xd0/0x2a0 [ 596.187028][ T1172] ? __do_sys_io_uring_enter+0x1b00/0x1b00 [ 596.193798][ T1172] schedule_preempt_disabled+0xf/0x20 [ 596.199246][ T1172] kthread+0x2ac/0x4a0 [ 596.203331][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 596.208606][ T1172] ret_from_fork+0x1f/0x30 [ 596.213047][ T1172] [ 596.213047][ T1172] Showing all locks held in the system: [ 596.220844][ T1172] 1 lock held by khungtaskd/1172: [ 596.225882][ T1172] #0: ffffffff89c67980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 596.235826][ T1172] 1 lock held by in:imklog/6561: [ 596.240812][ T1172] #0: ffff8880943e3b70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 596.250226][ T1172] [ 596.252572][ T1172] ============================================= [ 596.252572][ T1172] [ 596.261024][ T1172] NMI backtrace for cpu 0 [ 596.265354][ T1172] CPU: 0 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.274783][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.285000][ T1172] Call Trace: [ 596.288396][ T1172] dump_stack+0x198/0x1fd [ 596.292932][ T1172] nmi_cpu_backtrace.cold+0x44/0xd7 [ 596.298216][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.303852][ T1172] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 596.309877][ T1172] watchdog+0xd89/0xf30 [ 596.314027][ T1172] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.319938][ T1172] kthread+0x3b5/0x4a0 [ 596.323986][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 596.329079][ T1172] ret_from_fork+0x1f/0x30 [ 596.333582][ T1172] Sending NMI from CPU 0 to CPUs 1: [ 596.339380][ C1] NMI backtrace for cpu 1 [ 596.339386][ C1] CPU: 1 PID: 3901 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.339392][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.339401][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 [ 596.339412][ C1] Code: 5d be 03 00 00 00 e9 b6 2c 29 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 c0 fe 01 00 <65> 8b 05 e0 2e 8d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 [ 596.339415][ C1] RSP: 0018:ffffc900053afc28 EFLAGS: 00000093 [ 596.339423][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817a9abc [ 596.339428][ C1] RDX: ffff888094340380 RSI: ffffffff817a9ac5 RDI: 0000000000000005 [ 596.339433][ C1] RBP: ffffffff8ccc7df0 R08: 0000000000000000 R09: ffffffff8ccc7df3 [ 596.339438][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a200c840 [ 596.339443][ C1] R13: ffffffff87fc59cf R14: ffffffff8ccc7df0 R15: ffffffff8ccc7de8 [ 596.339448][ C1] FS: 00007f6222db38c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 596.339453][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 596.339457][ C1] CR2: 00007f6220157010 CR3: 000000009411a000 CR4: 00000000001506e0 [ 596.339462][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 596.339467][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 596.339470][ C1] Call Trace: [ 596.339473][ C1] trace_hardirqs_on+0x55/0x220 [ 596.339477][ C1] _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.339481][ C1] __debug_object_init+0x401/0xce0 [ 596.339484][ C1] ? lock_downgrade+0x830/0x830 [ 596.339488][ C1] ? debug_object_destroy+0x210/0x210 [ 596.339492][ C1] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.339496][ C1] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 596.339499][ C1] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 596.339503][ C1] debug_object_activate+0x32c/0x3e0 [ 596.339507][ C1] ? debug_object_assert_init+0x2e0/0x2e0 [ 596.339510][ C1] ? lock_is_held_type+0xbb/0xf0 [ 596.339514][ C1] ? percpu_counter_add_batch+0x126/0x180 [ 596.339517][ C1] ? get_max_files+0x10/0x10 [ 596.339520][ C1] call_rcu+0x2c/0x7c0 [ 596.339524][ C1] ? _raw_spin_unlock_irq+0x1f/0x80 [ 596.339527][ C1] task_work_run+0xdd/0x190 [ 596.339531][ C1] exit_to_user_mode_prepare+0x1e1/0x200 [ 596.339535][ C1] syscall_exit_to_user_mode+0x7e/0x2e0 [ 596.339539][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 596.339542][ C1] RIP: 0033:0x7f6222343840 [ 596.339552][ C1] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 596.339555][ C1] RSP: 002b:00007ffd663be848 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 596.339564][ C1] RAX: fffffffffffffffe RBX: 00007ffd663beb50 RCX: 00007f6222343840 [ 596.339568][ C1] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000557c05d36900 [ 596.339573][ C1] RBP: 000000000000000d R08: 00000000000001c0 R09: 00000000ffffffff [ 596.339578][ C1] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 596.339583][ C1] R13: 0000557c05d2a040 R14: 00007ffd663beb10 R15: 0000557c05d36950 [ 596.340745][ T1172] Kernel panic - not syncing: hung_task: blocked tasks [ 596.656758][ T1172] CPU: 0 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200902-syzkaller #0 [ 596.666211][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 596.676261][ T1172] Call Trace: [ 596.679549][ T1172] dump_stack+0x198/0x1fd [ 596.684075][ T1172] panic+0x347/0x7c0 [ 596.688074][ T1172] ? __warn_printk+0xf3/0xf3 [ 596.692659][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 596.698342][ T1172] ? preempt_schedule_thunk+0x16/0x18 [ 596.703716][ T1172] ? watchdog.cold+0x22d/0x24b [ 596.708507][ T1172] ? watchdog+0xc59/0xf30 [ 596.712820][ T1172] watchdog.cold+0x23e/0x24b [ 596.717535][ T1172] ? trace_sched_process_hang+0x2e0/0x2e0 [ 596.723235][ T1172] kthread+0x3b5/0x4a0 [ 596.727285][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 596.732421][ T1172] ret_from_fork+0x1f/0x30 [ 596.738346][ T1172] Kernel Offset: disabled [ 596.742669][ T1172] Rebooting in 86400 seconds..