[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 747.428185] block nbd0: shutting down sockets [ 1001.330637] INFO: task syz-executor592:7989 blocked for more than 140 seconds. [ 1001.338072] Not tainted 4.14.286-syzkaller #0 [ 1001.343770] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.351819] syz-executor592 D28648 7989 7988 0x80000006 [ 1001.357456] Call Trace: [ 1001.360041] __schedule+0x88b/0x1de0 [ 1001.363793] ? io_schedule_timeout+0x140/0x140 [ 1001.368369] ? lock_downgrade+0x740/0x740 [ 1001.372564] schedule+0x8d/0x1b0 [ 1001.375935] schedule_preempt_disabled+0xf/0x20 [ 1001.380638] __mutex_lock+0x669/0x1310 [ 1001.384524] ? blkdev_put+0x27/0x4c0 [ 1001.388222] ? locks_remove_file+0x2c8/0x420 [ 1001.392696] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.398151] ? lock_downgrade+0x740/0x740 [ 1001.402377] ? _raw_spin_unlock+0x29/0x40 [ 1001.406525] ? locks_remove_file+0x2cd/0x420 [ 1001.410983] ? blkdev_put+0x4c0/0x4c0 [ 1001.414773] blkdev_put+0x27/0x4c0 [ 1001.418296] ? blkdev_put+0x4c0/0x4c0 [ 1001.422130] blkdev_close+0x86/0xb0 [ 1001.425770] __fput+0x25f/0x7a0 [ 1001.429031] task_work_run+0x11f/0x190 [ 1001.433119] do_exit+0xa44/0x2850 [ 1001.436567] ? __mutex_unlock_slowpath+0x75/0x770 [ 1001.441460] ? wait_for_completion_io+0x10/0x10 [ 1001.446151] ? mm_update_next_owner+0x5b0/0x5b0 [ 1001.450870] ? get_signal+0x323/0x1ca0 [ 1001.454752] ? lock_acquire+0x170/0x3f0 [ 1001.458705] ? lock_downgrade+0x740/0x740 [ 1001.462888] do_group_exit+0x100/0x2e0 [ 1001.466773] get_signal+0x38d/0x1ca0 [ 1001.470550] do_signal+0x7c/0x1550 [ 1001.474087] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1001.479171] ? debug_check_no_obj_freed+0x2c0/0x680 [ 1001.484224] ? setup_sigcontext+0x820/0x820 [ 1001.488540] ? block_ioctl+0xd9/0x120 [ 1001.492383] ? blkdev_fallocate+0x3a0/0x3a0 [ 1001.496714] ? do_vfs_ioctl+0xe2/0xff0 [ 1001.500656] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 1001.506115] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.510573] ? kmem_cache_free+0x23a/0x2b0 [ 1001.514836] ? putname+0xcd/0x110 [ 1001.518273] ? do_sys_open+0x208/0x410 [ 1001.522200] ? exit_to_usermode_loop+0x41/0x200 [ 1001.526864] exit_to_usermode_loop+0x160/0x200 [ 1001.531555] ? SyS_ioctl+0x5c/0xb0 [ 1001.535094] do_syscall_64+0x4a3/0x640 [ 1001.538973] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.544193] RIP: 0033:0x7f72d32386f9 [ 1001.547910] RSP: 002b:00007ffc1f9d7058 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.555676] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007f72d32386f9 [ 1001.562989] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 [ 1001.570247] RBP: 0000000000000000 R08: 00007ffc1f9d71f8 R09: 00007ffc1f9d71f8 [ 1001.577585] R10: 000000000000ffff R11: 0000000000000246 R12: 00007f72d31f7780 [ 1001.584900] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 1001.592249] INFO: task systemd-udevd:7993 blocked for more than 140 seconds. [ 1001.599426] Not tainted 4.14.286-syzkaller #0 [ 1001.604479] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.612541] systemd-udevd D27464 7993 4629 0x00000304 [ 1001.618160] Call Trace: [ 1001.620778] __schedule+0x88b/0x1de0 [ 1001.624503] ? io_schedule_timeout+0x140/0x140 [ 1001.629069] ? mark_held_locks+0xa6/0xf0 [ 1001.633185] schedule+0x8d/0x1b0 [ 1001.636548] io_schedule+0xb5/0x120 [ 1001.640165] wait_on_page_bit+0x241/0x320 [ 1001.644494] ? wake_page_function+0x180/0x180 [ 1001.648983] ? __lru_cache_add+0x178/0x250 [ 1001.653273] ? __bread_gfp+0x2e0/0x2e0 [ 1001.657173] ? add_to_page_cache_lru+0x2b0/0x2b0 [ 1001.661976] ? alloc_pages_current+0x15d/0x260 [ 1001.666555] do_read_cache_page+0x55f/0xc10 [ 1001.670933] ? blkdev_writepages+0xd0/0xd0 [ 1001.675159] read_dev_sector+0xbd/0x3c0 [ 1001.679118] adfspart_check_ICS+0xf6/0xc00 [ 1001.683392] ? pointer+0x9e0/0x9e0 [ 1001.687007] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.691675] ? snprintf+0xa5/0xd0 [ 1001.695140] ? vsprintf+0x30/0x30 [ 1001.698641] ? __get_vm_area_node+0x27d/0x340 [ 1001.703194] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.707803] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.712441] check_partition+0x330/0x610 [ 1001.716501] rescan_partitions+0x192/0x800 [ 1001.720801] ? wait_for_completion_io+0x10/0x10 [ 1001.725468] ? nbd_alloc_config+0x180/0x180 [ 1001.729774] __blkdev_get+0xd7f/0x1090 [ 1001.733740] ? lookup_fast+0x430/0xe30 [ 1001.737625] ? sb_min_blocksize+0x1d0/0x1d0 [ 1001.741979] ? fsnotify+0x974/0x11b0 [ 1001.745693] blkdev_get+0x88/0x890 [ 1001.749216] ? __blkdev_get+0x1090/0x1090 [ 1001.753408] ? lock_downgrade+0x740/0x740 [ 1001.757555] ? do_raw_spin_unlock+0x164/0x220 [ 1001.762085] ? _raw_spin_unlock+0x29/0x40 [ 1001.766231] blkdev_open+0x1cc/0x250 [ 1001.769924] ? security_file_open+0x82/0x190 [ 1001.774383] do_dentry_open+0x44b/0xec0 [ 1001.778350] ? blkdev_get_by_dev+0x70/0x70 [ 1001.782618] vfs_open+0x105/0x220 [ 1001.786079] path_openat+0x628/0x2970 [ 1001.789882] ? path_lookupat+0x780/0x780 [ 1001.794020] ? trace_hardirqs_on+0x10/0x10 [ 1001.798254] ? lock_downgrade+0x740/0x740 [ 1001.802881] do_filp_open+0x179/0x3c0 [ 1001.806679] ? may_open_dev+0xe0/0xe0 [ 1001.810577] ? lock_downgrade+0x740/0x740 [ 1001.814720] ? do_raw_spin_unlock+0x164/0x220 [ 1001.819298] ? _raw_spin_unlock+0x29/0x40 [ 1001.823476] ? __alloc_fd+0x1be/0x490 [ 1001.827275] do_sys_open+0x296/0x410 [ 1001.831061] ? filp_open+0x60/0x60 [ 1001.834596] ? do_syscall_64+0x4c/0x640 [ 1001.838576] ? do_sys_open+0x410/0x410 [ 1001.842494] do_syscall_64+0x1d5/0x640 [ 1001.846376] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.851955] RIP: 0033:0x7f85e4e6b840 [ 1001.855663] RSP: 002b:00007fff191e9ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.863496] RAX: ffffffffffffffda RBX: 000055a42753c6e0 RCX: 00007f85e4e6b840 [ 1001.870826] RDX: 000055a426f59fe3 RSI: 00000000000a0800 RDI: 000055a4275411b0 [ 1001.878078] RBP: 00007fff191ea020 R08: 000055a426f59670 R09: 0000000000000010 [ 1001.885395] R10: 000055a426f59d0c R11: 0000000000000246 R12: 00007fff191e9f70 [ 1001.892719] R13: 000055a42753f880 R14: 0000000000000003 R15: 000000000000000e [ 1001.900002] [ 1001.900002] Showing all locks held in the system: [ 1001.906450] 1 lock held by khungtaskd/1533: [ 1001.910966] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.920025] 1 lock held by in:imklog/7687: [ 1001.924294] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1001.933103] 1 lock held by syz-executor592/7989: [ 1001.937860] #0: (&bdev->bd_mutex){+.+.}, at: [] blkdev_put+0x27/0x4c0 [ 1001.946232] 1 lock held by systemd-udevd/7993: [ 1001.950894] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 [ 1001.959573] [ 1001.961224] ============================================= [ 1001.961224] [ 1001.968255] NMI backtrace for cpu 0 [ 1001.971957] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.286-syzkaller #0 [ 1001.979411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 [ 1001.988748] Call Trace: [ 1001.991330] dump_stack+0x1b2/0x281 [ 1001.994945] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.999440] ? irq_force_complete_move+0x350/0x350 [ 1002.004350] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1002.009608] watchdog+0x5b9/0xb40 [ 1002.013044] ? hungtask_pm_notify+0x50/0x50 [ 1002.018129] kthread+0x30d/0x420 [ 1002.021517] ? kthread_create_on_node+0xd0/0xd0 [ 1002.026252] ret_from_fork+0x24/0x30 [ 1002.030023] Sending NMI from CPU 0 to CPUs 1: [ 1002.034605] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8723e1ee [ 1002.035661] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.048400] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.286-syzkaller #0 [ 1002.055831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 [ 1002.065165] Call Trace: [ 1002.067735] dump_stack+0x1b2/0x281 [ 1002.071344] panic+0x1f9/0x42d [ 1002.074523] ? add_taint.cold+0x16/0x16 [ 1002.078479] watchdog+0x5ca/0xb40 [ 1002.081917] ? hungtask_pm_notify+0x50/0x50 [ 1002.086224] kthread+0x30d/0x420 [ 1002.089654] ? kthread_create_on_node+0xd0/0xd0 [ 1002.094302] ret_from_fork+0x24/0x30 [ 1002.098332] Kernel Offset: disabled [ 1002.101968] Rebooting in 86400 seconds..