[ 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 '10.128.0.165' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 857.992112] INFO: task syz-executor310:7966 blocked for more than 140 seconds. [ 857.999600] Not tainted 4.14.281-syzkaller #0 [ 858.005698] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.013712] syz-executor310 D28288 7966 7958 0x00000004 [ 858.019323] Call Trace: [ 858.022144] __schedule+0x88b/0x1de0 [ 858.025862] ? io_schedule_timeout+0x140/0x140 [ 858.030424] ? trace_hardirqs_on+0x10/0x10 [ 858.034719] schedule+0x8d/0x1b0 [ 858.038078] schedule_timeout+0x80a/0xe90 [ 858.042274] ? usleep_range+0x130/0x130 [ 858.046251] ? try_to_wake_up+0x6de/0x1100 [ 858.050547] ? wait_for_common+0x26a/0x430 [ 858.054809] ? lock_acquire+0x170/0x3f0 [ 858.058770] ? lock_downgrade+0x740/0x740 [ 858.062959] ? _raw_spin_unlock_irq+0x24/0x80 [ 858.067444] wait_for_common+0x272/0x430 [ 858.071485] ? out_of_line_wait_on_atomic_t+0x1a0/0x1a0 [ 858.077066] ? wake_up_q+0xd0/0xd0 [ 858.080605] ? _raw_spin_unlock_irq+0x24/0x80 [ 858.085216] flush_work+0x3fe/0x770 [ 858.088846] ? worker_thread+0xff0/0xff0 [ 858.092932] ? flush_workqueue_prep_pwqs+0x470/0x470 [ 858.098031] ? __cancel_work_timer+0x2c1/0x460 [ 858.102671] __cancel_work_timer+0x321/0x460 [ 858.107076] ? work_on_cpu_safe+0x70/0x70 [ 858.111201] ? lock_acquire+0x170/0x3f0 [ 858.115198] ? lock_downgrade+0x740/0x740 [ 858.119340] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 858.124494] p9_fd_close+0x28d/0x420 [ 858.128195] p9_client_create+0x736/0x12c0 [ 858.132468] ? p9_client_flush+0x4c0/0x4c0 [ 858.136693] ? __lockdep_init_map+0x100/0x560 [ 858.141170] ? __raw_spin_lock_init+0x28/0x100 [ 858.145833] v9fs_session_init+0x1c5/0x1540 [ 858.150194] ? pcpu_alloc+0xbe0/0xf50 [ 858.154037] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 858.158875] ? v9fs_show_options+0x6b0/0x6b0 [ 858.163326] ? v9fs_mount+0x54/0x860 [ 858.167024] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 858.172612] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 858.177634] ? kmem_cache_alloc_trace+0x36c/0x3d0 [ 858.182533] v9fs_mount+0x73/0x860 [ 858.186064] ? alloc_pages_current+0x15d/0x260 [ 858.190622] ? __lockdep_init_map+0x100/0x560 [ 858.195168] mount_fs+0x92/0x2a0 [ 858.198525] vfs_kern_mount.part.0+0x5b/0x470 [ 858.203069] do_mount+0xe65/0x2a30 [ 858.206598] ? copy_mount_string+0x40/0x40 [ 858.210810] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 858.215992] ? copy_mnt_ns+0xa30/0xa30 [ 858.219874] ? copy_mount_options+0x1fa/0x2f0 [ 858.224436] ? copy_mnt_ns+0xa30/0xa30 [ 858.228313] SyS_mount+0xa8/0x120 [ 858.231742] ? copy_mnt_ns+0xa30/0xa30 [ 858.235656] do_syscall_64+0x1d5/0x640 [ 858.239537] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.244761] RIP: 0033:0x7f0bd02d6359 [ 858.248457] RSP: 002b:00007f0bd0262278 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 858.256220] RAX: ffffffffffffffda RBX: 00007f0bd035b4f0 RCX: 00007f0bd02d6359 [ 858.263533] RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 [ 858.270780] RBP: 00007f0bd03280bc R08: 0000000020000740 R09: 65732f636f72702f [ 858.278064] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0bd0262280 [ 858.285383] R13: 7277732f7665642f R14: 64663d736e617274 R15: 00007f0bd035b4f8 [ 858.292687] [ 858.292687] Showing all locks held in the system: [ 858.298990] 1 lock held by khungtaskd/1534: [ 858.303411] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.312491] 2 locks held by kworker/1:2/3586: [ 858.316965] #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 [ 858.325415] #1: ((&m->rq)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 [ 858.333895] 1 lock held by in:imklog/7642: [ 858.338110] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 858.346560] [ 858.348173] ============================================= [ 858.348173] [ 858.355232] NMI backtrace for cpu 1 [ 858.358846] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.281-syzkaller #0 [ 858.366266] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.375600] Call Trace: [ 858.378172] dump_stack+0x1b2/0x281 [ 858.381774] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.386251] ? irq_force_complete_move+0x350/0x350 [ 858.391157] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.396410] watchdog+0x5b9/0xb40 [ 858.399837] ? hungtask_pm_notify+0x50/0x50 [ 858.404132] kthread+0x30d/0x420 [ 858.407473] ? kthread_create_on_node+0xd0/0xd0 [ 858.412115] ret_from_fork+0x24/0x30 [ 858.415874] Sending NMI from CPU 1 to CPUs 0: [ 858.420784] NMI backtrace for cpu 0 [ 858.420789] CPU: 0 PID: 4625 Comm: systemd-journal Not tainted 4.14.281-syzkaller #0 [ 858.420792] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.420795] task: ffff8880a1214180 task.stack: ffff8880a1218000 [ 858.420797] RIP: 0010:kmem_cache_alloc+0x1ae/0x3c0 [ 858.420800] RSP: 0018:ffff8880a121fb58 EFLAGS: 00000082 [ 858.420804] RAX: 0000000000000000 RBX: 00000000014080c0 RCX: 0000000000000000 [ 858.420807] RDX: 000000000000001b RSI: ffffffff87ccff80 RDI: ffffffff87ccffc0 [ 858.420810] RBP: ffff8880b60bf080 R08: ffffffff8b9ad0c8 R09: 0000000000000000 [ 858.420813] R10: 0000000000000000 R11: ffff8880a1214180 R12: ffffe8ffffc02a80 [ 858.420816] R13: 00000000014080c0 R14: ffff8880b60bf080 R15: 0000000000000282 [ 858.420820] FS: 00007fe3657538c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 858.420822] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 858.420825] CR2: 00007fe362b22000 CR3: 00000000a1305000 CR4: 00000000003406f0 [ 858.420829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 858.420832] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 858.420833] Call Trace: [ 858.420835] get_empty_filp+0x86/0x3f0 [ 858.420838] path_openat+0x84/0x2970 [ 858.420840] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 858.420842] ? putname+0xcd/0x110 [ 858.420844] ? path_lookupat+0x780/0x780 [ 858.420846] ? trace_hardirqs_on+0x10/0x10 [ 858.420848] ? getname+0x20/0x20 [ 858.420850] do_filp_open+0x179/0x3c0 [ 858.420852] ? may_open_dev+0xe0/0xe0 [ 858.420854] ? __alloc_fd+0x1be/0x490 [ 858.420857] ? lock_downgrade+0x740/0x740 [ 858.420859] ? do_raw_spin_unlock+0x164/0x220 [ 858.420861] ? _raw_spin_unlock+0x29/0x40 [ 858.420863] ? __alloc_fd+0x1be/0x490 [ 858.420865] do_sys_open+0x296/0x410 [ 858.420867] ? filp_open+0x60/0x60 [ 858.420869] ? do_syscall_64+0x4c/0x640 [ 858.420871] ? do_sys_open+0x410/0x410 [ 858.420873] do_syscall_64+0x1d5/0x640 [ 858.420876] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.420878] RIP: 0033:0x7fe364ce2840 [ 858.420880] RSP: 002b:00007ffccf1a8e78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 858.420886] RAX: ffffffffffffffda RBX: 00007ffccf1a9180 RCX: 00007fe364ce2840 [ 858.420889] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055777c2b6460 [ 858.420892] RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff [ 858.420895] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 858.420898] R13: 000055777c2ab040 R14: 00007ffccf1a9140 R15: 000055777c2b64b0 [ 858.420899] Code: c6 e9 c7 fe ff ff 48 8b 80 a8 04 00 00 a8 04 0f 85 13 ff ff ff 4d 8b 26 e8 90 4a 9b 01 89 c0 4c 03 24 c5 60 9d cc 88 41 8b 14 24 <85> d2 0f 84 73 01 00 00 41 c7 44 24 0c 01 00 00 00 83 ea 01 41 [ 858.421465] Kernel panic - not syncing: hung_task: blocked tasks [ 858.684718] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.281-syzkaller #0 [ 858.692151] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.701477] Call Trace: [ 858.704043] dump_stack+0x1b2/0x281 [ 858.707646] panic+0x1f9/0x42d [ 858.710813] ? add_taint.cold+0x16/0x16 [ 858.714767] watchdog+0x5ca/0xb40 [ 858.718196] ? hungtask_pm_notify+0x50/0x50 [ 858.722493] kthread+0x30d/0x420 [ 858.725833] ? kthread_create_on_node+0xd0/0xd0 [ 858.730494] ret_from_fork+0x24/0x30 [ 858.734458] Kernel Offset: disabled [ 858.738074] Rebooting in 86400 seconds..