[ 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 '10.128.0.209' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 760.679006] block nbd0: shutting down sockets [ 1001.342258] INFO: task syz-executor340:7970 blocked for more than 140 seconds. [ 1001.349710] Not tainted 4.14.288-syzkaller #0 [ 1001.355789] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.363905] syz-executor340 D28464 7970 7969 0x80000006 [ 1001.369804] Call Trace: [ 1001.372438] __schedule+0x88b/0x1de0 [ 1001.376164] ? do_syscall_64+0x4a3/0x640 [ 1001.380209] ? io_schedule_timeout+0x140/0x140 [ 1001.384834] ? lock_downgrade+0x740/0x740 [ 1001.388986] schedule+0x8d/0x1b0 [ 1001.392392] schedule_preempt_disabled+0xf/0x20 [ 1001.397059] __mutex_lock+0x669/0x1310 [ 1001.400960] ? blkdev_put+0x27/0x4c0 [ 1001.404722] ? locks_remove_file+0x2c8/0x420 [ 1001.409126] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.414713] ? lock_downgrade+0x740/0x740 [ 1001.418854] ? _raw_spin_unlock+0x29/0x40 [ 1001.423031] ? locks_remove_file+0x2cd/0x420 [ 1001.427434] ? blkdev_put+0x4c0/0x4c0 [ 1001.431213] blkdev_put+0x27/0x4c0 [ 1001.434787] ? blkdev_put+0x4c0/0x4c0 [ 1001.438580] blkdev_close+0x86/0xb0 [ 1001.442233] __fput+0x25f/0x7a0 [ 1001.445598] task_work_run+0x11f/0x190 [ 1001.449467] do_exit+0xa44/0x2850 [ 1001.452947] ? __mutex_unlock_slowpath+0x75/0x770 [ 1001.457787] ? wait_for_completion_io+0x10/0x10 [ 1001.462483] ? mm_update_next_owner+0x5b0/0x5b0 [ 1001.467143] ? get_signal+0x323/0x1ca0 [ 1001.471009] ? lock_acquire+0x170/0x3f0 [ 1001.475527] ? lock_downgrade+0x740/0x740 [ 1001.479676] do_group_exit+0x100/0x2e0 [ 1001.483587] get_signal+0x38d/0x1ca0 [ 1001.487298] do_signal+0x7c/0x1550 [ 1001.490816] ? lock_acquire+0x170/0x3f0 [ 1001.494818] ? lock_downgrade+0x740/0x740 [ 1001.498956] ? setup_sigcontext+0x820/0x820 [ 1001.503301] ? block_ioctl+0xd9/0x120 [ 1001.507091] ? blkdev_fallocate+0x3a0/0x3a0 [ 1001.511392] ? do_vfs_ioctl+0xe2/0xff0 [ 1001.515307] ? get_unused_fd_flags+0xc0/0xc0 [ 1001.519707] ? ioctl_preallocate+0x1a0/0x1a0 [ 1001.524143] ? SyS_socketpair+0x37e/0x480 [ 1001.528284] ? exit_to_usermode_loop+0x41/0x200 [ 1001.532980] exit_to_usermode_loop+0x160/0x200 [ 1001.537571] ? SyS_ioctl+0x5c/0xb0 [ 1001.541093] do_syscall_64+0x4a3/0x640 [ 1001.545012] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.550188] RIP: 0033:0x7f542c2cd3e9 [ 1001.553922] RSP: 002b:00007ffefaa122d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1001.561623] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007f542c2cd3e9 [ 1001.568923] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 [ 1001.576228] RBP: 0000000000000000 R08: 00007ffefaa12478 R09: 00007ffefaa12478 [ 1001.583534] R10: 00007ffefaa12478 R11: 0000000000000246 R12: 00007f542c28c700 [ 1001.590793] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 1001.598114] INFO: task systemd-udevd:7973 blocked for more than 140 seconds. [ 1001.605655] Not tainted 4.14.288-syzkaller #0 [ 1001.610648] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.618635] systemd-udevd D27464 7973 4626 0x00000304 [ 1001.624304] Call Trace: [ 1001.626881] __schedule+0x88b/0x1de0 [ 1001.630577] ? io_schedule_timeout+0x140/0x140 [ 1001.635182] ? mark_held_locks+0xa6/0xf0 [ 1001.639236] schedule+0x8d/0x1b0 [ 1001.642627] io_schedule+0xb5/0x120 [ 1001.646247] wait_on_page_bit+0x241/0x320 [ 1001.650376] ? wake_page_function+0x180/0x180 [ 1001.655157] ? __lru_cache_add+0x178/0x250 [ 1001.659381] ? __bread_gfp+0x2e0/0x2e0 [ 1001.663294] ? add_to_page_cache_lru+0x2b0/0x2b0 [ 1001.668044] ? alloc_pages_current+0x15d/0x260 [ 1001.672655] do_read_cache_page+0x55f/0xc10 [ 1001.676967] ? blkdev_writepages+0xd0/0xd0 [ 1001.681187] read_dev_sector+0xbd/0x3c0 [ 1001.685183] adfspart_check_ICS+0xf6/0xc00 [ 1001.689408] ? pointer+0x9e0/0x9e0 [ 1001.692970] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.697544] ? snprintf+0xa5/0xd0 [ 1001.700975] ? vsprintf+0x30/0x30 [ 1001.704452] ? __get_vm_area_node+0x27d/0x340 [ 1001.708938] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.713537] ? adfspart_check_ADFS+0x7d0/0x7d0 [ 1001.718109] check_partition+0x330/0x610 [ 1001.722197] rescan_partitions+0x192/0x800 [ 1001.726421] ? wait_for_completion_io+0x10/0x10 [ 1001.731069] ? nbd_alloc_config+0x180/0x180 [ 1001.736040] __blkdev_get+0xd7f/0x1090 [ 1001.739942] ? lookup_fast+0x430/0xe30 [ 1001.743864] ? sb_min_blocksize+0x1d0/0x1d0 [ 1001.748182] ? fsnotify+0x974/0x11b0 [ 1001.751876] blkdev_get+0x88/0x890 [ 1001.755796] ? __blkdev_get+0x1090/0x1090 [ 1001.759965] ? lock_downgrade+0x740/0x740 [ 1001.764159] ? do_raw_spin_unlock+0x164/0x220 [ 1001.768650] ? _raw_spin_unlock+0x29/0x40 [ 1001.772856] blkdev_open+0x1cc/0x250 [ 1001.776571] ? security_file_open+0x82/0x190 [ 1001.780975] do_dentry_open+0x44b/0xec0 [ 1001.784985] ? blkdev_get_by_dev+0x70/0x70 [ 1001.789246] vfs_open+0x105/0x220 [ 1001.792746] path_openat+0x628/0x2970 [ 1001.796547] ? path_lookupat+0x780/0x780 [ 1001.800588] ? trace_hardirqs_on+0x10/0x10 [ 1001.804865] ? lock_downgrade+0x740/0x740 [ 1001.809011] do_filp_open+0x179/0x3c0 [ 1001.812847] ? may_open_dev+0xe0/0xe0 [ 1001.816644] ? lock_downgrade+0x740/0x740 [ 1001.820777] ? do_raw_spin_unlock+0x164/0x220 [ 1001.825302] ? _raw_spin_unlock+0x29/0x40 [ 1001.829449] ? __alloc_fd+0x1be/0x490 [ 1001.833287] do_sys_open+0x296/0x410 [ 1001.837004] ? filp_open+0x60/0x60 [ 1001.840532] ? do_syscall_64+0x4c/0x640 [ 1001.844550] ? do_sys_open+0x410/0x410 [ 1001.848430] do_syscall_64+0x1d5/0x640 [ 1001.852352] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.857882] RIP: 0033:0x7fe307706840 [ 1001.861570] RSP: 002b:00007ffdd87bb578 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.869805] RAX: ffffffffffffffda RBX: 000055bf57b20880 RCX: 00007fe307706840 [ 1001.877122] RDX: 000055bf56e52fe3 RSI: 00000000000a0800 RDI: 000055bf57b22210 [ 1001.884432] RBP: 00007ffdd87bb6f0 R08: 000055bf56e52670 R09: 0000000000000010 [ 1001.891702] R10: 000055bf56e52d0c R11: 0000000000000246 R12: 00007ffdd87bb640 [ 1001.899059] R13: 000055bf57b23070 R14: 0000000000000003 R15: 000000000000000e [ 1001.906391] [ 1001.906391] Showing all locks held in the system: [ 1001.912756] 1 lock held by khungtaskd/1534: [ 1001.917152] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.926244] 1 lock held by syz-executor340/7970: [ 1001.930987] #0: (&bdev->bd_mutex){+.+.}, at: [] blkdev_put+0x27/0x4c0 [ 1001.939361] 1 lock held by systemd-udevd/7973: [ 1001.944032] #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 [ 1001.952743] [ 1001.954360] ============================================= [ 1001.954360] [ 1001.961351] NMI backtrace for cpu 0 [ 1001.965020] CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.288-syzkaller #0 [ 1001.972458] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 [ 1001.981792] Call Trace: [ 1001.984374] dump_stack+0x1b2/0x281 [ 1001.987999] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.992473] ? irq_force_complete_move+0x350/0x350 [ 1001.997380] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1002.002640] watchdog+0x5b9/0xb40 [ 1002.006072] ? hungtask_pm_notify+0x50/0x50 [ 1002.010373] kthread+0x30d/0x420 [ 1002.013716] ? kthread_create_on_node+0xd0/0xd0 [ 1002.018371] ret_from_fork+0x24/0x30 [ 1002.022255] Sending NMI from CPU 0 to CPUs 1: [ 1002.026795] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8723e38e [ 1002.028295] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.040124] CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.288-syzkaller #0 [ 1002.047545] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 [ 1002.056877] Call Trace: [ 1002.059445] dump_stack+0x1b2/0x281 [ 1002.063051] panic+0x1f9/0x42d [ 1002.066220] ? add_taint.cold+0x16/0x16 [ 1002.070175] watchdog+0x5ca/0xb40 [ 1002.073605] ? hungtask_pm_notify+0x50/0x50 [ 1002.077903] kthread+0x30d/0x420 [ 1002.081274] ? kthread_create_on_node+0xd0/0xd0 [ 1002.085935] ret_from_fork+0x24/0x30 [ 1002.089913] Kernel Offset: disabled [ 1002.093529] Rebooting in 86400 seconds..