[ 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 '10.128.1.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 763.083927] block nbd0: shutting down sockets [ 1001.409033] INFO: task syz-executor756:7976 blocked for more than 140 seconds. [ 1001.416525] Not tainted 4.14.212-syzkaller #0 [ 1001.422488] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.430848] syz-executor756 D28640 7976 7975 0x80000006 [ 1001.436463] Call Trace: [ 1001.439085] __schedule+0x88b/0x1de0 [ 1001.442798] ? io_schedule_timeout+0x140/0x140 [ 1001.447415] ? lock_downgrade+0x740/0x740 [ 1001.451660] schedule+0x8d/0x1b0 [ 1001.455023] schedule_preempt_disabled+0xf/0x20 [ 1001.459759] __mutex_lock+0x669/0x1310 [ 1001.463657] ? blkdev_put+0x27/0x4c0 [ 1001.467362] ? locks_remove_file+0x2c8/0x420 [ 1001.471825] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.477271] ? lock_downgrade+0x740/0x740 [ 1001.481478] ? _raw_spin_unlock+0x29/0x40 [ 1001.485622] ? locks_remove_file+0x2cd/0x420 [ 1001.490079] ? blkdev_put+0x4c0/0x4c0 [ 1001.493898] blkdev_put+0x27/0x4c0 [ 1001.497502] ? blkdev_put+0x4c0/0x4c0 [ 1001.501330] blkdev_close+0x86/0xb0 [ 1001.504951] __fput+0x25f/0x7a0 [ 1001.508225] task_work_run+0x11f/0x190 [ 1001.512147] do_exit+0xa44/0x2850 [ 1001.515601] ? __mutex_unlock_slowpath+0x75/0x770 [ 1001.520468] ? wait_for_completion_io+0x10/0x10 [ 1001.525129] ? mm_update_next_owner+0x5b0/0x5b0 [ 1001.529838] ? get_signal+0x323/0x1ca0 [ 1001.533741] ? lock_acquire+0x170/0x3f0 [ 1001.537704] ? lock_downgrade+0x740/0x740 [ 1001.541896] do_group_exit+0x100/0x2e0 [ 1001.546148] get_signal+0x38d/0x1ca0 [ 1001.549943] do_signal+0x7c/0x1550 [ 1001.553480] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.558560] ? debug_check_no_obj_freed+0x2c0/0x674 [ 1001.564191] ? setup_sigcontext+0x820/0x820 [ 1001.568516] ? block_ioctl+0xd9/0x120 [ 1001.572355] ? blkdev_fallocate+0x3a0/0x3a0 [ 1001.576674] ? do_vfs_ioctl+0xe2/0xff0 [ 1001.580606] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.586065] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.590672] ? kmem_cache_free+0x23a/0x2b0 [ 1001.594920] ? putname+0xcd/0x110 [ 1001.598351] ? do_sys_open+0x208/0x410 [ 1001.602269] ? exit_to_usermode_loop+0x41/0x200 [ 1001.606929] exit_to_usermode_loop+0x160/0x200 [ 1001.611566] ? SyS_ioctl+0x5c/0xb0 [ 1001.615099] do_syscall_64+0x4a3/0x640 [ 1001.619018] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.624201] RIP: 0033:0x445089 [ 1001.627481] RSP: 002b:00007fffcdd57ac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.635228] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000445089 [ 1001.642563] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000008 [ 1001.649889] RBP: 00000000006d0018 R08: 00000000004002e0 R09: 00000000004002e0 [ 1001.657164] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402250 [ 1001.664458] R13: 00000000004022e0 R14: 0000000000000000 R15: 0000000000000000 [ 1001.671809] INFO: task systemd-udevd:7980 blocked for more than 140 seconds. [ 1001.679050] Not tainted 4.14.212-syzkaller #0 [ 1001.684053] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.692612] systemd-udevd D27464 7980 4633 0x00000104 [ 1001.698247] Call Trace: [ 1001.700885] __schedule+0x88b/0x1de0 [ 1001.704597] ? io_schedule_timeout+0x140/0x140 [ 1001.709217] ? mark_held_locks+0xa6/0xf0 [ 1001.713288] schedule+0x8d/0x1b0 [ 1001.716634] io_schedule+0xb5/0x120 [ 1001.720310] wait_on_page_bit+0x241/0x320 [ 1001.724465] ? wake_page_function+0x180/0x180 [ 1001.728996] ? __lru_cache_add+0x178/0x250 [ 1001.733226] ? __bread_gfp+0x2e0/0x2e0 [ 1001.737089] ? add_to_page_cache_lru+0x2b0/0x2b0 [ 1001.741888] ? alloc_pages_current+0x15d/0x260 [ 1001.746463] do_read_cache_page+0x55f/0xc10 [ 1001.750826] ? blkdev_writepages+0xd0/0xd0 [ 1001.755070] read_dev_sector+0xbd/0x3c0 [ 1001.759088] adfspart_check_ICS+0xf6/0xc00 [ 1001.763332] ? pointer+0x9e0/0x9e0 [ 1001.766849] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.771475] ? snprintf+0xa5/0xd0 [ 1001.774922] ? vsprintf+0x30/0x30 [ 1001.778374] ? __get_vm_area_node+0x27d/0x340 [ 1001.782929] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.787516] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.792133] check_partition+0x330/0x60a [ 1001.796193] rescan_partitions+0x192/0x800 [ 1001.800623] ? nbd_open+0x18d/0x380 [ 1001.804241] ? nbd_alloc_config+0x150/0x150 [ 1001.808543] __blkdev_get+0xd7f/0x1090 [ 1001.812479] ? lookup_fast+0x430/0xe30 [ 1001.816362] ? sb_min_blocksize+0x1d0/0x1d0 [ 1001.821232] ? fsnotify+0x974/0x11b0 [ 1001.824965] blkdev_get+0x88/0x890 [ 1001.828494] ? __blkdev_get+0x1090/0x1090 [ 1001.832681] ? lock_downgrade+0x740/0x740 [ 1001.836849] ? do_raw_spin_unlock+0x164/0x220 [ 1001.841389] ? _raw_spin_unlock+0x29/0x40 [ 1001.845547] blkdev_open+0x1cc/0x250 [ 1001.849300] ? security_file_open+0x82/0x190 [ 1001.853717] do_dentry_open+0x44b/0xec0 [ 1001.857671] ? blkdev_get_by_dev+0x70/0x70 [ 1001.862017] vfs_open+0x105/0x220 [ 1001.865497] path_openat+0x628/0x2970 [ 1001.869367] ? path_lookupat+0x780/0x780 [ 1001.873423] ? trace_hardirqs_on+0x10/0x10 [ 1001.877640] do_filp_open+0x179/0x3c0 [ 1001.881495] ? may_open_dev+0xe0/0xe0 [ 1001.885292] ? lock_downgrade+0x740/0x740 [ 1001.889486] ? do_raw_spin_unlock+0x164/0x220 [ 1001.893977] ? _raw_spin_unlock+0x29/0x40 [ 1001.898102] ? __alloc_fd+0x1be/0x490 [ 1001.901945] do_sys_open+0x296/0x410 [ 1001.905666] ? filp_open+0x60/0x60 [ 1001.909275] ? do_syscall_64+0x4c/0x640 [ 1001.913244] ? do_sys_open+0x410/0x410 [ 1001.917125] do_syscall_64+0x1d5/0x640 [ 1001.921054] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.926239] RIP: 0033:0x7f7f4daa4840 [ 1001.930045] RSP: 002b:00007fff5f77f478 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.937775] RAX: ffffffffffffffda RBX: 0000564d3b25b570 RCX: 00007f7f4daa4840 [ 1001.945093] RDX: 0000564d3a20ffe3 RSI: 00000000000a0800 RDI: 0000564d3b260a40 [ 1001.952746] RBP: 00007fff5f77f5f0 R08: 0000564d3a20f670 R09: 0000000000000010 [ 1001.960077] R10: 0000564d3a20fd0c R11: 0000000000000246 R12: 00007fff5f77f540 [ 1001.967342] R13: 0000564d3b25e550 R14: 0000000000000003 R15: 000000000000000e [ 1001.974695] [ 1001.974695] Showing all locks held in the system: [ 1001.981071] 1 lock held by khungtaskd/1531: [ 1001.985451] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.994594] 1 lock held by syz-executor756/7976: [ 1001.999408] #0: (&bdev->bd_mutex){+.+.}, at: [] blkdev_put+0x27/0x4c0 [ 1002.007750] 1 lock held by systemd-udevd/7980: [ 1002.012413] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 [ 1002.021149] [ 1002.022768] ============================================= [ 1002.022768] [ 1002.029988] NMI backtrace for cpu 0 [ 1002.033624] CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.212-syzkaller #0 [ 1002.041062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.050394] Call Trace: [ 1002.052972] dump_stack+0x1b2/0x283 [ 1002.056593] nmi_cpu_backtrace.cold+0x57/0x93 [ 1002.061065] ? irq_force_complete_move.cold+0x89/0x89 [ 1002.066247] nmi_trigger_cpumask_backtrace+0x13a/0x17f [ 1002.071521] watchdog+0x5b9/0xb40 [ 1002.074950] ? hungtask_pm_notify+0x50/0x50 [ 1002.079262] kthread+0x30d/0x420 [ 1002.082606] ? kthread_create_on_node+0xd0/0xd0 [ 1002.087256] ret_from_fork+0x24/0x30 [ 1002.091074] Sending NMI from CPU 0 to CPUs 1: [ 1002.096126] NMI backtrace for cpu 1 [ 1002.096130] CPU: 1 PID: 4611 Comm: systemd-journal Not tainted 4.14.212-syzkaller #0 [ 1002.096135] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.096138] task: ffff8880a1f14500 task.stack: ffff8880a1f18000 [ 1002.096140] RIP: 0010:lock_acquire+0x53/0x3f0 [ 1002.096143] RSP: 0018:ffff8880a1f1fcb0 EFLAGS: 00000002 [ 1002.096149] RAX: 0000000000000007 RBX: ffff8880a1f14500 RCX: 0000000000000000 [ 1002.096152] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a1f14d84 [ 1002.096156] RBP: ffffffff8c072d20 R08: 0000000000000001 R09: 0000000000000000 [ 1002.096159] R10: 0000000000000000 R11: ffff8880a1f14500 R12: 0000000000000000 [ 1002.096162] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 [ 1002.096166] FS: 00007f9fd983d8c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 1002.096169] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1002.096173] CR2: 00007f9fd6c1d000 CR3: 00000000a23c5000 CR4: 00000000001406e0 [ 1002.096176] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1002.096180] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1002.096182] Call Trace: [ 1002.096184] _raw_spin_lock_irqsave+0x8c/0xc0 [ 1002.096187] ? debug_check_no_obj_freed+0x135/0x674 [ 1002.096189] debug_check_no_obj_freed+0x135/0x674 [ 1002.096192] ? debug_object_activate+0x490/0x490 [ 1002.096194] kmem_cache_free+0x156/0x2b0 [ 1002.096197] putname+0xcd/0x110 [ 1002.096199] do_sys_open+0x203/0x410 [ 1002.096201] ? filp_open+0x60/0x60 [ 1002.096204] ? do_syscall_64+0x4c/0x640 [ 1002.096206] ? do_sys_open+0x410/0x410 [ 1002.096208] do_syscall_64+0x1d5/0x640 [ 1002.096211] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.096213] RIP: 0033:0x7f9fd8dcd840 [ 1002.096216] RSP: 002b:00007fff21b963a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1002.096222] RAX: ffffffffffffffda RBX: 00007fff21b966b0 RCX: 00007f9fd8dcd840 [ 1002.096225] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055b9f2f49280 [ 1002.096229] RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff [ 1002.096232] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 1002.096236] R13: 000055b9f2f3d040 R14: 00007fff21b96670 R15: 000055b9f2f48c70 [ 1002.096237] Code: 80 df 01 00 48 8d bb 84 08 00 00 48 83 ec 18 48 89 fa 4c 89 0c 24 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 <84> d2 0f 85 dd 02 00 00 8b b3 84 08 00 00 85 f6 0f 85 88 01 00 [ 1002.097203] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.330716] CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.212-syzkaller #0 [ 1002.338156] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.347503] Call Trace: [ 1002.350080] dump_stack+0x1b2/0x283 [ 1002.353697] panic+0x1f9/0x42d [ 1002.356898] ? add_taint.cold+0x16/0x16 [ 1002.360869] watchdog+0x5ca/0xb40 [ 1002.364301] ? hungtask_pm_notify+0x50/0x50 [ 1002.368602] kthread+0x30d/0x420 [ 1002.371946] ? kthread_create_on_node+0xd0/0xd0 [ 1002.376612] ret_from_fork+0x24/0x30 [ 1002.380936] Kernel Offset: disabled [ 1002.384568] Rebooting in 86400 seconds..