[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.570825][ T1174] INFO: task syz-executor275:6859 blocked for more than 143 seconds. [ 616.579518][ T1174] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.587150][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.596612][ T1174] task:syz-executor275 state:D stack:28104 pid: 6859 ppid: 6853 flags:0x00004000 [ 616.606105][ T1174] Call Trace: [ 616.609531][ T1174] __schedule+0xea9/0x2230 [ 616.614066][ T1174] ? io_schedule_timeout+0x140/0x140 [ 616.619401][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 616.624870][ T1174] schedule+0xd0/0x2a0 [ 616.628959][ T1174] schedule_timeout+0x1d8/0x250 [ 616.633907][ T1174] ? usleep_range+0x170/0x170 [ 616.638755][ T1174] ? lock_downgrade+0x830/0x830 [ 616.643872][ T1174] ? do_raw_spin_lock+0x120/0x2b0 [ 616.649057][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.654558][ T1174] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.660637][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.665858][ T1174] wait_for_completion+0x163/0x260 [ 616.671070][ T1174] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.677737][ T1174] ? apparmor_capable+0x1d8/0x460 [ 616.683031][ T1174] ? security_capable+0x8f/0xc0 [ 616.688034][ T1174] io_uring_setup+0x1495/0x29a0 [ 616.693161][ T1174] ? io_sq_thread+0xe00/0xe00 [ 616.697858][ T1174] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.702776][ T1174] ? io_wake_function+0x2e0/0x2e0 [ 616.707827][ T1174] ? check_preemption_disabled+0x50/0x130 [ 616.713689][ T1174] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.719687][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 616.725298][ T1174] do_syscall_64+0x2d/0x70 [ 616.729880][ T1174] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.736327][ T1174] RIP: 0033:0x440229 [ 616.740255][ T1174] Code: Bad RIP value. [ 616.744659][ T1174] RSP: 002b:00007fff16b71ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.753593][ T1174] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229 [ 616.762575][ T1174] RDX: 0000000000400ad0 RSI: 0000000020000380 RDI: 0000000000006c70 [ 616.770828][ T1174] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.778816][ T1174] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30 [ 616.787197][ T1174] R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 [ 616.795482][ T1174] INFO: task io_uring-sq:6860 blocked for more than 143 seconds. [ 616.803552][ T1174] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.810672][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.819467][ T1174] task:io_uring-sq state:D stack:31200 pid: 6860 ppid: 2 flags:0x00004000 [ 616.828738][ T1174] Call Trace: [ 616.832223][ T1174] __schedule+0xea9/0x2230 [ 616.836664][ T1174] ? io_schedule_timeout+0x140/0x140 [ 616.842079][ T1174] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.847906][ T1174] schedule+0xd0/0x2a0 [ 616.852065][ T1174] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.858103][ T1174] schedule_preempt_disabled+0xf/0x20 [ 616.863945][ T1174] kthread+0x2ac/0x4a0 [ 616.868046][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 616.873353][ T1174] ret_from_fork+0x1f/0x30 [ 616.877818][ T1174] [ 616.877818][ T1174] Showing all locks held in the system: [ 616.885768][ T1174] 1 lock held by khungtaskd/1174: [ 616.890891][ T1174] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.900992][ T1174] 2 locks held by in:imklog/6549: [ 616.906085][ T1174] #0: ffff8880946bf3b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.915618][ T1174] #1: ffff8880ae635fd8 (&rq->lock){-.-.}-{2:2}, at: is_bpf_text_address+0x0/0x160 [ 616.925424][ T1174] [ 616.927770][ T1174] ============================================= [ 616.927770][ T1174] [ 616.936474][ T1174] NMI backtrace for cpu 1 [ 616.941028][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.950490][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.960563][ T1174] Call Trace: [ 616.964067][ T1174] dump_stack+0x198/0x1fd [ 616.968455][ T1174] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.973700][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.979530][ T1174] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.985559][ T1174] watchdog+0xd89/0xf30 [ 616.989724][ T1174] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.995440][ T1174] kthread+0x3b5/0x4a0 [ 616.999502][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 617.004741][ T1174] ret_from_fork+0x1f/0x30 [ 617.009296][ T1174] Sending NMI from CPU 1 to CPUs 0: [ 617.014990][ C0] NMI backtrace for cpu 0 [ 617.014998][ C0] CPU: 0 PID: 3908 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 617.015005][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.015011][ C0] RIP: 0010:slab_pre_alloc_hook.constprop.0+0xcb/0x200 [ 617.015023][ C0] Code: 48 85 c0 49 89 c6 0f 84 cf 00 00 00 41 8b 54 24 14 89 ee 48 89 c7 48 83 c2 08 49 0f af d5 e8 ec 08 07 00 85 c0 75 43 4c 89 33 <5b> 4c 89 e0 5d 41 5c 41 5d 41 5e c3 31 d2 be f1 01 00 00 48 c7 c7 [ 617.015027][ C0] RSP: 0018:ffffc9000533fdd8 EFLAGS: 00000246 [ 617.015037][ C0] RAX: 0000000000000000 RBX: ffffc9000533fe18 RCX: 0000000000000000 [ 617.015042][ C0] RDX: dffffc0000000000 RSI: 0000000000000400 RDI: ffff8880aa06f900 [ 617.015048][ C0] RBP: 0000000000000cc0 R08: 0000000000000001 R09: ffff88809324ee88 [ 617.015054][ C0] R10: fffffbfff15796c1 R11: 0000000000000000 R12: ffff8880aa06f900 [ 617.015060][ C0] R13: 0000000000000001 R14: ffff8880aa06f900 R15: 0000000000000000 [ 617.015066][ C0] FS: 00007f3668b908c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 617.015071][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 617.015077][ C0] CR2: 00007f3665f34000 CR3: 0000000093763000 CR4: 00000000001506f0 [ 617.015082][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 617.015088][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 617.015101][ C0] Call Trace: [ 617.015105][ C0] kmem_cache_alloc+0x46/0x3a0 [ 617.015109][ C0] prepare_creds+0x3b/0x730 [ 617.015114][ C0] do_faccessat+0x3d7/0x820 [ 617.015117][ C0] ? stream_open+0x60/0x60 [ 617.015122][ C0] ? __secure_computing+0x104/0x360 [ 617.015126][ C0] do_syscall_64+0x2d/0x70 [ 617.015131][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 617.015135][ C0] RIP: 0033:0x7f3667e4c9c7 [ 617.015146][ C0] Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 [ 617.015150][ C0] RSP: 002b:00007ffd5246cf78 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 617.015161][ C0] RAX: ffffffffffffffda RBX: 00007ffd5246ffa0 RCX: 00007f3667e4c9c7 [ 617.015166][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000564f8362c9a3 [ 617.015172][ C0] RBP: 00007ffd5246d0c0 R08: 0000564f836223e5 R09: 0000000000000018 [ 617.015178][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 617.015183][ C0] R13: 0000000000000000 R14: 0000564f84ba28a0 R15: 00007ffd5246d5b0 [ 617.015631][ T1174] Kernel panic - not syncing: hung_task: blocked tasks [ 617.269388][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 617.278919][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.289288][ T1174] Call Trace: [ 617.292581][ T1174] dump_stack+0x198/0x1fd [ 617.296964][ T1174] panic+0x347/0x7c0 [ 617.300860][ T1174] ? __warn_printk+0xf3/0xf3 [ 617.305594][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.311220][ T1174] ? preempt_schedule_thunk+0x16/0x18 [ 617.316637][ T1174] ? watchdog.cold+0x22d/0x24b [ 617.321522][ T1174] ? watchdog+0xc59/0xf30 [ 617.325914][ T1174] watchdog.cold+0x23e/0x24b [ 617.330647][ T1174] ? trace_sched_process_hang+0x2e0/0x2e0 [ 617.336494][ T1174] kthread+0x3b5/0x4a0 [ 617.340878][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 617.345986][ T1174] ret_from_fork+0x1f/0x30 [ 617.351954][ T1174] Kernel Offset: disabled [ 617.356422][ T1174] Rebooting in 86400 seconds..