[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 48.415610][ T6811] sshd (6811) used greatest stack depth: 23456 bytes left Warning: Permanently added '10.128.0.123' (ECDSA) to the list of known hosts. executing program [ 636.897985][ T1169] INFO: task syz-executor184:6851 blocked for more than 143 seconds. [ 636.906198][ T1169] Not tainted 5.9.0-rc1-syzkaller #0 [ 636.912407][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.921150][ T1169] task:syz-executor184 state:D stack:28096 pid: 6851 ppid: 6845 flags:0x80000002 [ 636.930540][ T1169] Call Trace: [ 636.933984][ T1169] __schedule+0x8e5/0x21e0 [ 636.938454][ T1169] ? io_schedule_timeout+0x140/0x140 [ 636.943865][ T1169] ? do_raw_spin_lock+0x120/0x2b0 [ 636.948955][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.954160][ T1169] schedule+0xd0/0x2a0 [ 636.959113][ T1169] io_uring_flush+0x759/0xe60 [ 636.963796][ T1169] ? io_req_task_cancel+0x20/0x20 [ 636.969872][ T1169] ? add_wait_queue_exclusive+0x180/0x180 [ 636.975645][ T1169] ? find_held_lock+0x2d/0x110 [ 636.981204][ T1169] ? lock_is_held_type+0xbb/0xf0 [ 636.986136][ T1169] ? io_req_task_cancel+0x20/0x20 [ 636.991929][ T1169] filp_close+0xb4/0x170 [ 636.996278][ T1169] put_files_struct+0x1cc/0x350 [ 637.001961][ T1169] exit_files+0x7e/0xa0 [ 637.006169][ T1169] do_exit+0xb43/0x29f0 [ 637.010990][ T1169] ? mm_update_next_owner+0x7a0/0x7a0 [ 637.016351][ T1169] ? io_submit_sqes+0x2380/0x2380 [ 637.022118][ T1169] ? __sys_socket+0x16d/0x200 [ 637.026789][ T1169] ? lock_is_held_type+0xbb/0xf0 [ 637.032439][ T1169] do_group_exit+0x125/0x310 [ 637.037019][ T1169] __x64_sys_exit_group+0x3a/0x50 [ 637.042680][ T1169] do_syscall_64+0x2d/0x70 [ 637.047091][ T1169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.053659][ T1169] RIP: 0033:0x43f298 [ 637.057539][ T1169] Code: Bad RIP value. [ 637.062571][ T1169] RSP: 002b:00007fff11096d28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 637.071689][ T1169] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f298 [ 637.080132][ T1169] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 637.088624][ T1169] RBP: 00000000004beaa8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 637.096587][ T1169] R10: 0000000000400a29 R11: 0000000000000246 R12: 0000000000000001 [ 637.105241][ T1169] R13: 00000000006d01a0 R14: 0000000000000000 R15: 0000000000000000 [ 637.113728][ T1169] [ 637.113728][ T1169] Showing all locks held in the system: [ 637.121935][ T1169] 1 lock held by khungtaskd/1169: [ 637.126940][ T1169] #0: ffffffff89bd6340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.137557][ T1169] 1 lock held by in:imklog/6536: [ 637.142943][ T1169] #0: ffff88809a28a430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.152532][ T1169] [ 637.154855][ T1169] ============================================= [ 637.154855][ T1169] [ 637.164393][ T1169] NMI backtrace for cpu 1 [ 637.168846][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc1-syzkaller #0 [ 637.177071][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.187126][ T1169] Call Trace: [ 637.190484][ T1169] dump_stack+0x18f/0x20d [ 637.194818][ T1169] nmi_cpu_backtrace.cold+0x70/0xb1 [ 637.200051][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.205662][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.211658][ T1169] watchdog+0xd7d/0x1000 [ 637.215891][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 637.221467][ T1169] kthread+0x3b5/0x4a0 [ 637.225510][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 637.230595][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 637.235757][ T1169] ret_from_fork+0x1f/0x30 [ 637.240261][ T1169] Sending NMI from CPU 1 to CPUs 0: [ 637.245881][ C0] NMI backtrace for cpu 0 [ 637.245886][ C0] CPU: 0 PID: 6536 Comm: in:imklog Not tainted 5.9.0-rc1-syzkaller #0 [ 637.245893][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.245896][ C0] RIP: 0010:__fget_files+0x13a/0x400 [ 637.245908][ C0] Code: 08 3c 03 0f 8e b1 02 00 00 8b 5d 00 44 89 f7 89 de e8 5a 75 ad ff 41 39 de 0f 83 81 01 00 00 e8 4c 79 ad ff 44 89 f0 48 39 d8 <48> 19 db 48 8d 7d 08 44 21 f3 48 89 f8 48 c1 e8 03 42 80 3c 28 00 [ 637.245912][ C0] RSP: 0018:ffffc900093f7e00 EFLAGS: 00000283 [ 637.245919][ C0] RAX: 0000000000000004 RBX: 0000000000000040 RCX: ffffffff81c6c826 [ 637.245924][ C0] RDX: ffff888095b5c1c0 RSI: ffffffff81c6c834 RDI: 0000000000000004 [ 637.245929][ C0] RBP: ffff8880a71f3be0 R08: 0000000000000001 R09: ffffffff8c5f09e7 [ 637.245934][ C0] R10: 0000000000000004 R11: 0000000000000000 R12: ffff8880a71f3b80 [ 637.245939][ C0] R13: dffffc0000000000 R14: 0000000000000004 R15: 0000000000001fa0 [ 637.245945][ C0] FS: 00007fbbc9a1f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 637.245949][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.245954][ C0] CR2: 00007f0e6cf30000 CR3: 00000000a438a000 CR4: 00000000001506f0 [ 637.245959][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.245964][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.245967][ C0] Call Trace: [ 637.245970][ C0] ? kmsg_release+0x20/0x20 [ 637.245973][ C0] __fget_light+0xd4/0x280 [ 637.245976][ C0] __fdget_pos+0x19/0x100 [ 637.245979][ C0] ksys_read+0x6e/0x250 [ 637.245982][ C0] ? vfs_write+0x730/0x730 [ 637.245986][ C0] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 637.245989][ C0] ? trace_hardirqs_on+0x5f/0x220 [ 637.245992][ C0] ? lockdep_hardirqs_on+0x76/0xf0 [ 637.245995][ C0] do_syscall_64+0x2d/0x70 [ 637.245999][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.246002][ C0] RIP: 0033:0x7fbbcc06222d [ 637.246013][ C0] Code: 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 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 97 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 637.246017][ C0] RSP: 002b:00007fbbc99fe580 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 [ 637.246026][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbbcc06222d [ 637.246031][ C0] RDX: 0000000000001fa0 RSI: 00007fbbc99feda0 RDI: 0000000000000004 [ 637.246036][ C0] RBP: 000055d20516e9d0 R08: 0000000000000000 R09: 0000000000000000 [ 637.246041][ C0] R10: 2ce33e6c02ce33e7 R11: 0000000000000293 R12: 00007fbbc99feda0 [ 637.246046][ C0] R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007fbbc99ff0b3 [ 637.246466][ T1169] Kernel panic - not syncing: hung_task: blocked tasks [ 637.508631][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc1-syzkaller #0 [ 637.516849][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.526880][ T1169] Call Trace: [ 637.530150][ T1169] dump_stack+0x18f/0x20d [ 637.534525][ T1169] panic+0x2e3/0x75c [ 637.538396][ T1169] ? __warn_printk+0xf3/0xf3 [ 637.543068][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.548696][ T1169] ? preempt_schedule_thunk+0x16/0x18 [ 637.554052][ T1169] ? watchdog.cold+0x5/0x16b [ 637.558633][ T1169] ? watchdog+0xa82/0x1000 [ 637.563038][ T1169] watchdog.cold+0x16/0x16b [ 637.567532][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 637.573054][ T1169] kthread+0x3b5/0x4a0 [ 637.577098][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 637.582208][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 637.587307][ T1169] ret_from_fork+0x1f/0x30 [ 637.594596][ T1169] Kernel Offset: disabled [ 637.598920][ T1169] Rebooting in 86400 seconds..