[ 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 '10.128.0.70' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 1001.395175] INFO: task syz-executor237:7988 blocked for more than 140 seconds. [ 1001.402876] Not tainted 4.14.218-syzkaller #0 [ 1001.409215] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.418199] syz-executor237 D27592 7988 7985 0x00000004 [ 1001.424019] Call Trace: [ 1001.427433] __schedule+0x88b/0x1de0 [ 1001.431373] ? io_schedule_timeout+0x140/0x140 [ 1001.437504] ? trace_hardirqs_on+0x10/0x10 [ 1001.441960] schedule+0x8d/0x1b0 [ 1001.446094] schedule_timeout+0x80a/0xe90 [ 1001.450258] ? usleep_range+0x130/0x130 [ 1001.454232] ? try_to_wake_up+0x706/0x1100 [ 1001.459567] ? wait_for_common+0x26a/0x430 [ 1001.463835] ? lock_acquire+0x170/0x3f0 [ 1001.468673] ? lock_downgrade+0x740/0x740 [ 1001.472822] ? _raw_spin_unlock_irq+0x24/0x80 [ 1001.478054] wait_for_common+0x272/0x430 [ 1001.482121] ? out_of_line_wait_on_atomic_t+0x1a0/0x1a0 [ 1001.488168] ? wake_up_q+0xd0/0xd0 [ 1001.491764] ? _raw_spin_unlock_irq+0x24/0x80 [ 1001.497136] flush_work+0x3fe/0x770 [ 1001.500774] ? worker_thread+0xff0/0xff0 [ 1001.504854] ? flush_workqueue_prep_pwqs+0x470/0x470 [ 1001.511197] ? __cancel_work_timer+0x2c1/0x460 [ 1001.516629] __cancel_work_timer+0x321/0x460 [ 1001.521147] ? work_on_cpu_safe+0x70/0x70 [ 1001.526057] ? lock_acquire+0x170/0x3f0 [ 1001.530036] ? lock_downgrade+0x740/0x740 [ 1001.534168] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1001.540205] p9_fd_close+0x28d/0x420 [ 1001.543925] p9_client_create+0x736/0x12c0 [ 1001.549164] ? p9_client_flush+0x4c0/0x4c0 [ 1001.553398] ? __lockdep_init_map+0x100/0x560 [ 1001.558729] ? __raw_spin_lock_init+0x28/0x100 [ 1001.563494] v9fs_session_init+0x1c5/0x1540 [ 1001.568545] ? pcpu_alloc+0xbe0/0xf50 [ 1001.572511] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 1001.578130] ? v9fs_show_options+0x6b0/0x6b0 [ 1001.582546] ? v9fs_mount+0x54/0x860 [ 1001.587011] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.592676] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1001.598392] ? kmem_cache_alloc_trace+0x36c/0x3d0 [ 1001.603250] v9fs_mount+0x73/0x860 [ 1001.607564] ? alloc_pages_current+0x15d/0x260 [ 1001.612330] ? __lockdep_init_map+0x100/0x560 [ 1001.618178] mount_fs+0x92/0x2a0 [ 1001.621554] vfs_kern_mount.part.0+0x5b/0x470 [ 1001.626766] do_mount+0xe53/0x2a00 [ 1001.630382] ? do_raw_spin_unlock+0x164/0x220 [ 1001.634906] ? copy_mount_string+0x40/0x40 [ 1001.640247] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1001.645732] ? copy_mnt_ns+0xa30/0xa30 [ 1001.649658] ? copy_mount_options+0x1fa/0x2f0 [ 1001.654150] ? copy_mnt_ns+0xa30/0xa30 [ 1001.659061] SyS_mount+0xa8/0x120 [ 1001.662522] ? copy_mnt_ns+0xa30/0xa30 [ 1001.667178] do_syscall_64+0x1d5/0x640 [ 1001.671245] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.677594] RIP: 0033:0x44a249 [ 1001.680780] RSP: 002b:00007f86bc092278 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 1001.689223] RAX: ffffffffffffffda RBX: 00000000004cb510 RCX: 000000000044a249 [ 1001.697285] RDX: 0000000020000080 RSI: 0000000020000300 RDI: 0000000000000000 [ 1001.704561] RBP: 000000000049b0bc R08: 0000000020000740 R09: 65732f636f72702f [ 1001.713209] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f86bc092280 [ 1001.721000] R13: 7277732f7665642f R14: 64663d736e617274 R15: 00000000004cb518 [ 1001.728764] [ 1001.728764] Showing all locks held in the system: [ 1001.735882] 1 lock held by khungtaskd/1531: [ 1001.740280] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.749629] 2 locks held by kworker/0:2/3623: [ 1001.754123] #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 [ 1001.762845] #1: ((&m->rq)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 [ 1001.771436] 1 lock held by in:imklog/7706: [ 1001.776555] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1001.785102] [ 1001.786741] ============================================= [ 1001.786741] [ 1001.793929] NMI backtrace for cpu 0 [ 1001.797717] CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 [ 1001.805161] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.814522] Call Trace: [ 1001.817258] dump_stack+0x1b2/0x281 [ 1001.820966] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.825514] ? irq_force_complete_move+0x350/0x350 [ 1001.830502] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.835777] watchdog+0x5b9/0xb40 [ 1001.839220] ? hungtask_pm_notify+0x50/0x50 [ 1001.843529] kthread+0x30d/0x420 [ 1001.846885] ? kthread_create_on_node+0xd0/0xd0 [ 1001.851567] ret_from_fork+0x24/0x30 [ 1001.855410] Sending NMI from CPU 0 to CPUs 1: [ 1001.860356] NMI backtrace for cpu 1 [ 1001.860361] CPU: 1 PID: 4610 Comm: systemd-journal Not tainted 4.14.218-syzkaller #0 [ 1001.860365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.860368] task: ffff8880a1e404c0 task.stack: ffff8880a1e48000 [ 1001.860371] RIP: 0010:preempt_count_add+0x20/0x170 [ 1001.860373] RSP: 0018:ffff8880a1e4fa58 EFLAGS: 00000802 [ 1001.860379] RAX: dffffc0000000000 RBX: ffffffff8beb4d40 RCX: 0000000000000001 [ 1001.860382] RDX: 0000000000000004 RSI: 0000000000000001 RDI: 0000000000000001 [ 1001.860386] RBP: 0000000000000001 R08: 000000000255ec80 R09: 0000000000000001 [ 1001.860389] R10: 0000000000000000 R11: ffff8880a1e404c0 R12: fffffffffffffffe [ 1001.860393] R13: 0000000000000001 R14: ffffea0002c43aa0 R15: ffffea0002c43a80 [ 1001.860396] FS: 00007ff2500e78c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 1001.860399] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.860403] CR2: 00007ff24d4b9000 CR3: 00000000a1e7b000 CR4: 00000000001406e0 [ 1001.860406] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.860409] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.860411] Call Trace: [ 1001.860413] kmem_freepages.isra.0+0x20b/0x3e0 [ 1001.860416] ? lock_downgrade+0x740/0x740 [ 1001.860418] slabs_destroy+0x90/0xd0 [ 1001.860421] ___cache_free+0x213/0x2c0 [ 1001.860423] qlist_free_all+0x79/0x140 [ 1001.860425] quarantine_reduce+0x185/0x200 [ 1001.860428] kasan_kmalloc+0xa2/0x160 [ 1001.860430] ? __lock_acquire+0x5fc/0x3f20 [ 1001.860433] ? seccomp_run_filters+0x151/0x540 [ 1001.860435] ? devkmsg_read+0x5f6/0x9b0 [ 1001.860438] ? __put_seccomp_filter+0x90/0x90 [ 1001.860440] ? trace_hardirqs_on+0x10/0x10 [ 1001.860443] ? __lock_acquire+0x5fc/0x3f20 [ 1001.860445] ? __seccomp_filter+0xbd/0xd60 [ 1001.860448] ? seccomp_send_sigsys+0x180/0x180 [ 1001.860450] ? fsnotify+0x974/0x11b0 [ 1001.860453] ? fs_reclaim_release+0xd0/0x110 [ 1001.860456] ? kmem_cache_alloc+0x2c8/0x3c0 [ 1001.860458] kmem_cache_alloc+0x111/0x3c0 [ 1001.860461] prepare_creds+0x39/0x490 [ 1001.860463] SyS_faccessat+0x7b/0x680 [ 1001.860465] ? SyS_fallocate+0x80/0x80 [ 1001.860468] ? do_syscall_64+0x4c/0x640 [ 1001.860470] ? SyS_faccessat+0x680/0x680 [ 1001.860473] do_syscall_64+0x1d5/0x640 [ 1001.860476] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.860478] RIP: 0033:0x7ff24f3a39c7 [ 1001.860481] RSP: 002b:00007ffd91cc54f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 1001.860487] RAX: ffffffffffffffda RBX: 00007ffd91cc8410 RCX: 00007ff24f3a39c7 [ 1001.860490] RDX: 00007ff24fe14a00 RSI: 0000000000000000 RDI: 000055aae901a9a3 [ 1001.860494] RBP: 00007ffd91cc5530 R08: 0000000000000000 R09: 0000000000000000 [ 1001.860497] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 1001.860501] R13: 0000000000000000 R14: 00007ffd91cc8410 R15: 00007ffd91cc5a20 [ 1001.860502] Code: ff 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 89 fd 53 48 c7 c3 40 4d eb 8b 48 89 da 48 c1 ea 03 0f b6 14 02 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 11 01 00 00 [ 1001.860926] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.156103] CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 [ 1002.163649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.173019] Call Trace: [ 1002.175619] dump_stack+0x1b2/0x281 [ 1002.179237] panic+0x1f9/0x42d [ 1002.182417] ? add_taint.cold+0x16/0x16 [ 1002.186387] watchdog+0x5ca/0xb40 [ 1002.189895] ? hungtask_pm_notify+0x50/0x50 [ 1002.194225] kthread+0x30d/0x420 [ 1002.197635] ? kthread_create_on_node+0xd0/0xd0 [ 1002.202584] ret_from_fork+0x24/0x30 [ 1002.206479] Kernel Offset: disabled [ 1002.210122] Rebooting in 86400 seconds..