[ 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 '10.128.1.0' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 636.664443][ T1175] INFO: task syz-executor886:6868 blocked for more than 143 seconds. [ 636.672669][ T1175] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 636.679928][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.688666][ T1175] task:syz-executor886 state:D stack:28104 pid: 6868 ppid: 6862 flags:0x00004000 [ 636.697996][ T1175] Call Trace: [ 636.701396][ T1175] __schedule+0xea9/0x2230 [ 636.706035][ T1175] ? io_schedule_timeout+0x140/0x140 [ 636.711432][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 636.716851][ T1175] schedule+0xd0/0x2a0 [ 636.720919][ T1175] schedule_timeout+0x1d8/0x250 [ 636.725977][ T1175] ? usleep_range+0x170/0x170 [ 636.730752][ T1175] ? lock_downgrade+0x830/0x830 [ 636.735784][ T1175] ? do_raw_spin_lock+0x120/0x2b0 [ 636.740807][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.746063][ T1175] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 636.752293][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.757574][ T1175] wait_for_completion+0x163/0x260 [ 636.762685][ T1175] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 636.769365][ T1175] ? apparmor_capable+0x1d8/0x460 [ 636.774499][ T1175] ? security_capable+0x8f/0xc0 [ 636.779390][ T1175] io_uring_setup+0x1495/0x29a0 [ 636.784299][ T1175] ? io_sq_thread+0xe00/0xe00 [ 636.788975][ T1175] ? io_issue_sqe+0x5bb0/0x5bb0 [ 636.793800][ T1175] ? io_wake_function+0x2e0/0x2e0 [ 636.798948][ T1175] ? check_preemption_disabled+0x50/0x130 [ 636.804734][ T1175] ? syscall_enter_from_user_mode+0x20/0x290 [ 636.810707][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 636.815987][ T1175] do_syscall_64+0x2d/0x70 [ 636.820403][ T1175] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 636.826348][ T1175] RIP: 0033:0x440229 [ 636.830226][ T1175] Code: Bad RIP value. [ 636.834336][ T1175] RSP: 002b:00007ffcbba6a288 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 636.842744][ T1175] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229 [ 636.850771][ T1175] RDX: 0000000000400ad0 RSI: 0000000020000180 RDI: 0000000000003796 [ 636.858787][ T1175] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 636.866881][ T1175] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30 [ 636.874896][ T1175] R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 [ 636.882890][ T1175] INFO: task io_uring-sq:6869 blocked for more than 143 seconds. [ 636.890674][ T1175] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 636.897729][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.906454][ T1175] task:io_uring-sq state:D stack:31200 pid: 6869 ppid: 2 flags:0x00004000 [ 636.915703][ T1175] Call Trace: [ 636.918989][ T1175] __schedule+0xea9/0x2230 [ 636.923439][ T1175] ? io_schedule_timeout+0x140/0x140 [ 636.928956][ T1175] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 636.934834][ T1175] schedule+0xd0/0x2a0 [ 636.938904][ T1175] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 636.944764][ T1175] schedule_preempt_disabled+0xf/0x20 [ 636.950309][ T1175] kthread+0x2ac/0x4a0 [ 636.954417][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 636.959694][ T1175] ret_from_fork+0x1f/0x30 [ 636.964119][ T1175] [ 636.964119][ T1175] Showing all locks held in the system: [ 636.971908][ T1175] 1 lock held by khungtaskd/1175: [ 636.976970][ T1175] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 636.986899][ T1175] 2 locks held by in:imklog/6549: [ 636.992343][ T1175] #0: ffff888097a24bb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.001532][ T1175] #1: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: do_futex+0x566/0x1a50 [ 637.010665][ T1175] [ 637.012988][ T1175] ============================================= [ 637.012988][ T1175] [ 637.021422][ T1175] NMI backtrace for cpu 1 [ 637.025804][ T1175] CPU: 1 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.035232][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.045276][ T1175] Call Trace: [ 637.048632][ T1175] dump_stack+0x198/0x1fd [ 637.052943][ T1175] nmi_cpu_backtrace.cold+0x44/0xd7 [ 637.058160][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.063781][ T1175] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.069803][ T1175] watchdog+0xd89/0xf30 [ 637.073936][ T1175] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.079631][ T1175] kthread+0x3b5/0x4a0 [ 637.083671][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 637.088765][ T1175] ret_from_fork+0x1f/0x30 [ 637.093243][ T1175] Sending NMI from CPU 1 to CPUs 0: [ 637.098732][ C0] NMI backtrace for cpu 0 [ 637.098739][ C0] CPU: 0 PID: 3901 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.098746][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.098749][ C0] RIP: 0010:0xffffffffa00083f4 [ 637.098761][ C0] Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <0f> 1f 44 00 00 55 48 89 e5 48 81 ec 00 00 00 00 53 41 55 41 56 41 [ 637.098765][ C0] RSP: 0018:ffffc9000536fd90 EFLAGS: 00000246 [ 637.098774][ C0] RAX: 1ffff920001acc06 RBX: ffff8880942e0c00 RCX: dffffc0000000000 [ 637.098779][ C0] RDX: ffff888093a003c0 RSI: ffffc90000d66038 RDI: ffffc9000536fe40 [ 637.098784][ C0] RBP: ffffc90000d66000 R08: 0000000000000001 R09: 0000000000000001 [ 637.098790][ C0] R10: 000000007fff0000 R11: 0000000000000000 R12: dffffc0000000000 [ 637.098796][ C0] R13: 000000007fff0000 R14: 000000007fff0000 R15: ffffc9000536fe40 [ 637.098802][ C0] FS: 00007f6147e858c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 637.098806][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.098812][ C0] CR2: 00007f6145229000 CR3: 0000000093ab2000 CR4: 00000000001506f0 [ 637.098817][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.098823][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.098825][ C0] Call Trace: [ 637.098829][ C0] ? __seccomp_filter+0x151/0x1520 [ 637.098833][ C0] ? seccomp_notify_ioctl+0xd90/0xd90 [ 637.098838][ C0] ? security_file_permission+0x248/0x560 [ 637.098841][ C0] ? lock_is_held_type+0xbb/0xf0 [ 637.098845][ C0] ? __secure_computing+0xfc/0x360 [ 637.098850][ C0] ? syscall_enter_from_user_mode+0xb7/0x290 [ 637.098853][ C0] ? do_syscall_64+0xf/0x70 [ 637.098858][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.099495][ T1175] Kernel panic - not syncing: hung_task: blocked tasks [ 637.288345][ T1175] CPU: 1 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.297781][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.307808][ T1175] Call Trace: [ 637.311090][ T1175] dump_stack+0x198/0x1fd [ 637.315451][ T1175] panic+0x347/0x7c0 [ 637.319332][ T1175] ? __warn_printk+0xf3/0xf3 [ 637.323901][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.329511][ T1175] ? preempt_schedule_thunk+0x16/0x18 [ 637.334862][ T1175] ? watchdog.cold+0x22d/0x24b [ 637.339613][ T1175] ? watchdog+0xc59/0xf30 [ 637.343929][ T1175] watchdog.cold+0x23e/0x24b [ 637.348498][ T1175] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.354206][ T1175] kthread+0x3b5/0x4a0 [ 637.358257][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 637.363343][ T1175] ret_from_fork+0x1f/0x30 [ 637.368973][ T1175] Kernel Offset: disabled [ 637.373293][ T1175] Rebooting in 86400 seconds..