[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 769.797111] block nbd0: shutting down sockets [ 794.943088] block nbd0: Connection timed out [ 794.947729] print_req_error: I/O error, dev nbd0, sector 0 [ 794.953472] Buffer I/O error on dev nbd0, logical block 0, async page read [ 794.960499] block nbd0: Connection timed out [ 794.964982] print_req_error: I/O error, dev nbd0, sector 2 [ 794.970594] Buffer I/O error on dev nbd0, logical block 1, async page read [ 794.977679] block nbd0: Connection timed out [ 794.982081] print_req_error: I/O error, dev nbd0, sector 4 [ 794.987749] Buffer I/O error on dev nbd0, logical block 2, async page read [ 794.994837] block nbd0: Connection timed out [ 794.999237] print_req_error: I/O error, dev nbd0, sector 6 [ 795.004893] Buffer I/O error on dev nbd0, logical block 3, async page read [ 795.012328] print_req_error: I/O error, dev nbd0, sector 0 [ 795.018017] Buffer I/O error on dev nbd0, logical block 0, async page read [ 795.025702] print_req_error: I/O error, dev nbd0, sector 2 [ 795.031398] Buffer I/O error on dev nbd0, logical block 1, async page read [ 795.038532] Buffer I/O error on dev nbd0, logical block 2, async page read [ 795.045648] Buffer I/O error on dev nbd0, logical block 3, async page read [ 795.053028] print_req_error: I/O error, dev nbd0, sector 0 [ 795.058646] Buffer I/O error on dev nbd0, logical block 0, async page read [ 795.065711] print_req_error: I/O error, dev nbd0, sector 2 [ 795.071322] Buffer I/O error on dev nbd0, logical block 1, async page read [ 795.078519] print_req_error: I/O error, dev nbd0, sector 0 [ 795.084202] print_req_error: I/O error, dev nbd0, sector 2 executing program executing program [ 795.090435] ldm_validate_partition_table(): Disk read failed. [ 795.097019] Dev nbd0: unable to read RDB block 0 [ 795.102303] nbd0: unable to read partition table [ 795.114023] block nbd0: Device being setup by another task [ 800.124994] block nbd0: shutting down sockets [ 1001.328303] INFO: task syz-executor134:8014 blocked for more than 140 seconds. [ 1001.335832] Not tainted 4.14.203-syzkaller #0 [ 1001.341826] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.349833] syz-executor134 D28912 8014 8004 0x80000006 [ 1001.355537] Call Trace: [ 1001.358175] __schedule+0x88b/0x1de0 [ 1001.361934] ? io_schedule_timeout+0x140/0x140 [ 1001.366550] ? lock_downgrade+0x740/0x740 [ 1001.370737] schedule+0x8d/0x1b0 [ 1001.374091] schedule_preempt_disabled+0xf/0x20 [ 1001.378776] __mutex_lock+0x669/0x1310 [ 1001.382690] ? blkdev_put+0x27/0x4c0 [ 1001.386545] ? locks_remove_file+0x2c8/0x420 [ 1001.391139] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.396623] ? lock_downgrade+0x740/0x740 [ 1001.400845] ? _raw_spin_unlock+0x29/0x40 [ 1001.404986] ? locks_remove_file+0x2cd/0x420 [ 1001.409429] ? blkdev_put+0x4c0/0x4c0 [ 1001.413218] blkdev_put+0x27/0x4c0 [ 1001.416755] ? blkdev_put+0x4c0/0x4c0 [ 1001.420571] blkdev_close+0x86/0xb0 [ 1001.424270] __fput+0x25f/0x7a0 [ 1001.427553] task_work_run+0x11f/0x190 [ 1001.431511] do_exit+0xa08/0x27f0 [ 1001.434972] ? __mutex_unlock_slowpath+0x75/0x770 [ 1001.440396] ? wait_for_completion_io+0x10/0x10 [ 1001.445049] ? mm_update_next_owner+0x5b0/0x5b0 [ 1001.449786] ? get_signal+0x323/0x1ca0 [ 1001.453669] ? lock_acquire+0x170/0x3f0 [ 1001.457622] ? lock_downgrade+0x740/0x740 [ 1001.461803] do_group_exit+0x100/0x2e0 [ 1001.465680] get_signal+0x38d/0x1ca0 [ 1001.469489] do_signal+0x7c/0x1550 [ 1001.473041] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.478251] ? debug_check_no_obj_freed+0x2c0/0x674 [ 1001.483259] ? setup_sigcontext+0x820/0x820 [ 1001.487556] ? block_ioctl+0xd9/0x120 [ 1001.491389] ? blkdev_fallocate+0x3a0/0x3a0 [ 1001.495728] ? do_vfs_ioctl+0xe2/0xff0 [ 1001.499711] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.505152] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.509631] ? kmem_cache_free+0x23a/0x2b0 [ 1001.513853] ? putname+0xcd/0x110 [ 1001.517290] ? do_sys_open+0x208/0x410 [ 1001.521233] ? exit_to_usermode_loop+0x41/0x200 [ 1001.525914] exit_to_usermode_loop+0x160/0x200 [ 1001.530531] ? SyS_ioctl+0x5c/0xb0 [ 1001.534058] do_syscall_64+0x4a3/0x640 [ 1001.537927] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.543131] RIP: 0033:0x445039 [ 1001.546310] RSP: 002b:00007ffc1bec52c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.554048] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000445039 [ 1001.561340] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 [ 1001.569036] RBP: 00000000000c223b R08: 00000000004002e0 R09: 00000000004002e0 [ 1001.576313] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000402200 [ 1001.583615] R13: 0000000000402290 R14: 0000000000000000 R15: 0000000000000000 [ 1001.590948] INFO: task systemd-udevd:8017 blocked for more than 140 seconds. [ 1001.598160] Not tainted 4.14.203-syzkaller #0 [ 1001.603157] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.611292] systemd-udevd D27464 8017 4632 0x00000104 [ 1001.616917] Call Trace: [ 1001.619531] __schedule+0x88b/0x1de0 [ 1001.623241] ? io_schedule_timeout+0x140/0x140 [ 1001.627802] ? mark_held_locks+0xa6/0xf0 [ 1001.631916] schedule+0x8d/0x1b0 [ 1001.635272] io_schedule+0xb5/0x120 [ 1001.638991] wait_on_page_bit+0x241/0x320 [ 1001.643142] ? wake_page_function+0x180/0x180 [ 1001.647658] ? __lru_cache_add+0x178/0x250 [ 1001.651931] ? __bread_gfp+0x2e0/0x2e0 [ 1001.655892] ? add_to_page_cache_lru+0x2b0/0x2b0 [ 1001.660683] ? alloc_pages_current+0x15d/0x260 [ 1001.665259] do_read_cache_page+0x55f/0xc10 [ 1001.669624] ? blkdev_writepages+0xd0/0xd0 [ 1001.674005] read_dev_sector+0xbd/0x3c0 [ 1001.677961] adfspart_check_ICS+0xf6/0xc00 [ 1001.682293] ? pointer+0x9e0/0x9e0 [ 1001.685829] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.690450] ? snprintf+0xa5/0xd0 [ 1001.693905] ? vsprintf+0x30/0x30 [ 1001.697400] ? __get_vm_area_node+0x27d/0x340 [ 1001.702499] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.707077] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.711695] check_partition+0x330/0x60a [ 1001.715749] rescan_partitions+0x192/0x800 [ 1001.720041] ? nbd_open+0x18d/0x380 [ 1001.723676] ? nbd_alloc_config+0x150/0x150 [ 1001.727977] __blkdev_get+0xd7f/0x1090 [ 1001.731903] ? lookup_fast+0x430/0xe30 [ 1001.735777] ? sb_min_blocksize+0x1d0/0x1d0 [ 1001.740175] ? fsnotify+0x974/0x11b0 [ 1001.743951] blkdev_get+0x88/0x890 [ 1001.747476] ? __blkdev_get+0x1090/0x1090 [ 1001.751662] ? lock_downgrade+0x740/0x740 [ 1001.755800] ? do_raw_spin_unlock+0x164/0x220 [ 1001.760315] ? _raw_spin_unlock+0x29/0x40 [ 1001.764456] blkdev_open+0x1cc/0x250 [ 1001.768316] ? security_file_open+0x82/0x190 [ 1001.772720] do_dentry_open+0x44b/0xec0 [ 1001.776700] ? blkdev_get_by_dev+0x70/0x70 [ 1001.780961] vfs_open+0x105/0x220 [ 1001.784407] path_openat+0x628/0x2970 [ 1001.788269] ? path_lookupat+0x780/0x780 [ 1001.792754] ? trace_hardirqs_on+0x10/0x10 [ 1001.796968] do_filp_open+0x179/0x3c0 [ 1001.800853] ? may_open_dev+0xe0/0xe0 [ 1001.804651] ? lock_downgrade+0x740/0x740 [ 1001.808884] ? do_raw_spin_unlock+0x164/0x220 [ 1001.813382] ? _raw_spin_unlock+0x29/0x40 [ 1001.817732] ? __alloc_fd+0x1be/0x490 [ 1001.821715] do_sys_open+0x296/0x410 [ 1001.825478] ? filp_open+0x60/0x60 [ 1001.829611] ? do_syscall_64+0x4c/0x640 [ 1001.833578] ? do_sys_open+0x410/0x410 [ 1001.837441] do_syscall_64+0x1d5/0x640 [ 1001.841397] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.846584] RIP: 0033:0x7f84c8e85840 [ 1001.850363] RSP: 002b:00007fffdbb8a908 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.858059] RAX: ffffffffffffffda RBX: 0000555769650500 RCX: 00007f84c8e85840 [ 1001.865352] RDX: 000055576795afe3 RSI: 00000000000a0800 RDI: 0000555769641b80 [ 1001.872827] RBP: 00007fffdbb8aa80 R08: 000055576795a670 R09: 0000000000000010 [ 1001.880180] R10: 000055576795ad0c R11: 0000000000000246 R12: 00007fffdbb8a9d0 [ 1001.887440] R13: 00005557696534b0 R14: 0000000000000003 R15: 000000000000000e [ 1001.894807] [ 1001.894807] Showing all locks held in the system: [ 1001.901226] 1 lock held by khungtaskd/1530: [ 1001.905581] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.914714] 1 lock held by syz-executor134/8014: [ 1001.919542] #0: (&bdev->bd_mutex){+.+.}, at: [] blkdev_put+0x27/0x4c0 [ 1001.927862] 1 lock held by systemd-udevd/8017: [ 1001.932480] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 [ 1001.941213] [ 1001.942847] ============================================= [ 1001.942847] [ 1001.949904] NMI backtrace for cpu 1 [ 1001.953551] CPU: 1 PID: 1530 Comm: khungtaskd Not tainted 4.14.203-syzkaller #0 [ 1001.960974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1001.970311] Call Trace: [ 1001.972875] dump_stack+0x1b2/0x283 [ 1001.976482] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.981006] ? irq_force_complete_move.cold+0x89/0x89 [ 1001.986178] nmi_trigger_cpumask_backtrace+0x13a/0x17f [ 1001.991491] watchdog+0x5b9/0xb40 [ 1001.994924] ? hungtask_pm_notify+0x50/0x50 [ 1001.999225] kthread+0x30d/0x420 [ 1002.002582] ? kthread_create_on_node+0xd0/0xd0 [ 1002.007227] ret_from_fork+0x24/0x30 [ 1002.011014] Sending NMI from CPU 1 to CPUs 0: [ 1002.015996] NMI backtrace for cpu 0 [ 1002.016000] CPU: 0 PID: 4622 Comm: systemd-journal Not tainted 4.14.203-syzkaller #0 [ 1002.016004] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.016006] task: ffff8880a11320c0 task.stack: ffff8880a1138000 [ 1002.016008] RIP: 0010:memcmp+0x3e/0xb0 [ 1002.016010] RSP: 0018:ffff8880a113faa8 EFLAGS: 00000202 [ 1002.016015] RAX: 0000000000000000 RBX: ffff8880a113fb84 RCX: 0000000000000003 [ 1002.016018] RDX: 0000000000000004 RSI: ffff8880a4355784 RDI: ffff8880a113fb48 [ 1002.016021] RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1002.016024] R10: 0000000000000000 R11: ffff8880a11320c0 R12: ffff8880a113fb90 [ 1002.016027] R13: 0000000000000009 R14: ffff8880a113fb48 R15: ffff8880a4355730 [ 1002.016035] FS: 00007f99061a68c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 1002.016038] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1002.016041] CR2: 00007f9903585000 CR3: 00000000a145e000 CR4: 00000000001406f0 [ 1002.016044] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1002.016047] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1002.016048] Call Trace: [ 1002.016051] depot_save_stack+0x10d/0x3e3 [ 1002.016053] kasan_kmalloc+0x139/0x160 [ 1002.016055] ? kasan_kmalloc+0xeb/0x160 [ 1002.016057] ? kmem_cache_alloc_trace+0x11b/0x3d0 [ 1002.016059] ? aa_alloc_task_context+0x4d/0x90 [ 1002.016061] ? apparmor_cred_prepare+0x1a/0xb0 [ 1002.016063] ? security_prepare_creds+0x76/0xb0 [ 1002.016065] ? prepare_creds+0x2ef/0x490 [ 1002.016067] ? SyS_faccessat+0x7b/0x680 [ 1002.016069] ? do_syscall_64+0x1d5/0x640 [ 1002.016072] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.016074] ? kasan_kmalloc+0x139/0x160 [ 1002.016076] ? kasan_kmalloc+0xeb/0x160 [ 1002.016078] ? kmem_cache_alloc+0x124/0x3c0 [ 1002.016080] ? trace_hardirqs_on+0x10/0x10 [ 1002.016082] ? entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.016085] ? __put_seccomp_filter+0x90/0x90 [ 1002.016087] ? debug_check_no_obj_freed+0x2c0/0x674 [ 1002.016089] ? trace_hardirqs_on+0x10/0x10 [ 1002.016091] ? lock_acquire+0x170/0x3f0 [ 1002.016093] ? lock_downgrade+0x740/0x740 [ 1002.016095] ? fs_reclaim_release+0xd0/0x110 [ 1002.016097] ? kmem_cache_alloc_trace+0x2d4/0x3d0 [ 1002.016099] kmem_cache_alloc_trace+0x11b/0x3d0 [ 1002.016101] aa_alloc_task_context+0x4d/0x90 [ 1002.016104] apparmor_cred_prepare+0x1a/0xb0 [ 1002.016106] security_prepare_creds+0x76/0xb0 [ 1002.016108] prepare_creds+0x2ef/0x490 [ 1002.016110] SyS_faccessat+0x7b/0x680 [ 1002.016112] ? SyS_fallocate+0x80/0x80 [ 1002.016113] ? do_syscall_64+0x4c/0x640 [ 1002.016115] ? SyS_faccessat+0x680/0x680 [ 1002.016117] do_syscall_64+0x1d5/0x640 [ 1002.016120] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1002.016122] RIP: 0033:0x7f99054629c7 [ 1002.016124] RSP: 002b:00007ffd4c9e7df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 1002.016129] RAX: ffffffffffffffda RBX: 00007ffd4c9eae20 RCX: 00007f99054629c7 [ 1002.016132] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000556dd21849a3 [ 1002.016135] RBP: 00007ffd4c9e7f40 R08: 0000556dd217a3e5 R09: 0000000000000018 [ 1002.016138] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 1002.016141] R13: 0000000000000000 R14: 0000556dd25e88a0 R15: 00007ffd4c9e8430 [ 1002.016143] Code: fc ff df 53 48 89 fb 48 83 ec 10 eb 0d 48 83 c3 01 48 83 c6 01 49 39 dc 74 45 48 89 d8 48 89 da 48 c1 e8 03 83 e2 07 0f b6 04 28 <38> d0 7f 04 84 c0 75 54 48 89 f2 48 89 f1 0f b6 03 48 c1 ea 03 [ 1002.017076] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.346633] CPU: 1 PID: 1530 Comm: khungtaskd Not tainted 4.14.203-syzkaller #0 [ 1002.354053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1002.363381] Call Trace: [ 1002.365950] dump_stack+0x1b2/0x283 [ 1002.369626] panic+0x1f9/0x42d [ 1002.372812] ? add_taint.cold+0x16/0x16 [ 1002.376765] watchdog+0x5ca/0xb40 [ 1002.380218] ? hungtask_pm_notify+0x50/0x50 [ 1002.384515] kthread+0x30d/0x420 [ 1002.387855] ? kthread_create_on_node+0xd0/0xd0 [ 1002.392504] ret_from_fork+0x24/0x30 [ 1002.396977] Kernel Offset: disabled [ 1002.400594] Rebooting in 86400 seconds..