[ 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 '10.128.0.205' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 493.462370] block nbd0: shutting down sockets [ 717.632778] INFO: task syz-executor120:8104 blocked for more than 140 seconds. [ 717.640284] Not tainted 4.19.172-syzkaller #0 [ 717.645517] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.653542] syz-executor120 D27056 8104 8103 0x80000006 [ 717.659173] Call Trace: [ 717.661755] __schedule+0x887/0x2040 [ 717.665521] ? io_schedule_timeout+0x140/0x140 [ 717.670105] ? lock_downgrade+0x720/0x720 [ 717.674299] ? __mutex_lock+0x458/0x1260 [ 717.678364] schedule+0x8d/0x1b0 [ 717.681715] schedule_preempt_disabled+0xf/0x20 [ 717.686426] __mutex_lock+0x647/0x1260 [ 717.690317] ? blkdev_put+0x30/0x520 [ 717.694077] ? __mutex_add_waiter+0x160/0x160 [ 717.698570] ? lock_downgrade+0x720/0x720 [ 717.702765] ? locks_remove_file+0x286/0x450 [ 717.707172] ? locks_check_ctx_file_list+0x1d/0x110 [ 717.712189] ? _raw_spin_unlock+0x29/0x40 [ 717.716377] ? locks_remove_file+0x2cd/0x450 [ 717.720783] ? blkdev_put+0x520/0x520 [ 717.724656] blkdev_put+0x30/0x520 [ 717.728191] ? blkdev_put+0x520/0x520 [ 717.731972] blkdev_close+0x86/0xb0 [ 717.735642] __fput+0x2ce/0x890 [ 717.738924] task_work_run+0x148/0x1c0 [ 717.742950] do_exit+0xbf3/0x2be0 [ 717.746419] ? mm_update_next_owner+0x650/0x650 [ 717.751068] ? get_signal+0x388/0x1f70 [ 717.757674] ? lock_downgrade+0x720/0x720 [ 717.761846] ? lock_acquire+0x170/0x3c0 [ 717.765872] do_group_exit+0x125/0x310 [ 717.769785] get_signal+0x3f2/0x1f70 [ 717.773577] do_signal+0x8f/0x1670 [ 717.777113] ? block_ioctl+0xe9/0x130 [ 717.780891] ? blkdev_fallocate+0x3f0/0x3f0 [ 717.785273] ? do_vfs_ioctl+0x110/0x12e0 [ 717.789332] ? setup_sigcontext+0x820/0x820 [ 717.793696] ? debug_check_no_obj_freed+0x201/0x490 [ 717.798709] ? ioctl_preallocate+0x200/0x200 [ 717.803164] ? putname+0xe1/0x120 [ 717.806614] ? putname+0xe1/0x120 [ 717.810055] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 717.815114] ? kmem_cache_free+0x226/0x260 [ 717.819347] ? putname+0xe1/0x120 [ 717.822847] ? do_sys_open+0x2bf/0x520 [ 717.826748] ? filp_open+0x70/0x70 [ 717.830269] ? exit_to_usermode_loop+0x36/0x2a0 [ 717.834995] exit_to_usermode_loop+0x204/0x2a0 [ 717.839576] do_syscall_64+0x538/0x620 [ 717.843516] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.848698] RIP: 0033:0x444589 [ 717.851879] Code: Bad RIP value. [ 717.855282] RSP: 002b:00007fff0bb505d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 717.863063] RAX: fffffffffffffe00 RBX: 00000000004004a0 RCX: 0000000000444589 [ 717.870320] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 [ 717.877641] RBP: 0000000000000000 R08: 002364626e2f7665 R09: 00007fff0bb50778 [ 717.885374] R10: 000000000000001f R11: 0000000000000246 R12: 0000000000403610 [ 717.892848] R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0 [ 717.900147] INFO: task systemd-udevd:8107 blocked for more than 140 seconds. [ 717.907410] Not tainted 4.19.172-syzkaller #0 [ 717.912417] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.920425] systemd-udevd D26624 8107 4696 0x00000104 [ 717.926117] Call Trace: [ 717.928705] __schedule+0x887/0x2040 [ 717.932407] ? io_schedule_timeout+0x140/0x140 [ 717.937052] schedule+0x8d/0x1b0 [ 717.940419] io_schedule+0xb5/0x120 [ 717.944095] wait_on_page_bit+0x2c5/0x3f0 [ 717.948248] ? wake_page_function+0x1b0/0x1b0 [ 717.953172] ? __bread_gfp+0x300/0x300 [ 717.957074] ? add_to_page_cache_lru+0x680/0x680 [ 717.961861] do_read_cache_page+0x8ed/0x1170 [ 717.966318] ? blkdev_writepages+0x20/0x20 [ 717.970551] read_dev_sector+0xbf/0x500 [ 717.974572] ? adfspart_check_ADFS+0x8e0/0x8e0 [ 717.979150] adfspart_check_ICS+0x114/0xe70 [ 717.983526] ? adfspart_check_ADFS+0x8e0/0x8e0 [ 717.988110] ? snprintf+0xbb/0xf0 [ 717.991546] ? vsprintf+0x30/0x30 [ 717.995060] ? _raw_spin_unlock+0x29/0x40 [ 717.999215] ? __get_vm_area_node+0x2e2/0x3a0 [ 718.003805] ? adfspart_check_ADFS+0x8e0/0x8e0 [ 718.008423] check_partition+0x390/0x690 [ 718.013214] rescan_partitions+0x1b5/0x970 [ 718.017459] ? nbd_open+0x4cc/0x6f0 [ 718.021066] ? nbd_add_socket+0x6f0/0x6f0 [ 718.026349] bdev_disk_changed+0x179/0x1b0 [ 718.030580] __blkdev_get+0x1282/0x1480 [ 718.035391] ? bdev_disk_changed+0x1b0/0x1b0 [ 718.039794] ? mark_held_locks+0xf0/0xf0 [ 718.044444] ? mark_held_locks+0xf0/0xf0 [ 718.048502] blkdev_get+0xb0/0x940 [ 718.052023] ? bd_acquire+0x245/0x440 [ 718.056670] ? __blkdev_get+0x1480/0x1480 [ 718.060814] ? lock_downgrade+0x720/0x720 [ 718.065620] ? lock_acquire+0x170/0x3c0 [ 718.069597] ? bd_acquire+0x21/0x440 [ 718.073901] ? do_raw_spin_unlock+0x171/0x230 [ 718.078394] blkdev_open+0x202/0x290 [ 718.082189] do_dentry_open+0x4aa/0x1160 [ 718.087068] ? blkdev_get_by_dev+0x70/0x70 [ 718.091299] ? chown_common+0x550/0x550 [ 718.095847] ? inode_permission+0x3d/0x140 [ 718.100116] path_openat+0x793/0x2df0 [ 718.104520] ? path_lookupat+0x8d0/0x8d0 [ 718.108587] ? __put_seccomp_filter+0xa0/0xa0 [ 718.113646] ? mark_held_locks+0xf0/0xf0 [ 718.117729] do_filp_open+0x18c/0x3f0 [ 718.121509] ? may_open_dev+0xf0/0xf0 [ 718.126723] ? lock_downgrade+0x720/0x720 [ 718.130862] ? lock_acquire+0x170/0x3c0 [ 718.135364] ? __alloc_fd+0x34/0x570 [ 718.139090] ? do_raw_spin_unlock+0x171/0x230 [ 718.144133] ? _raw_spin_unlock+0x29/0x40 [ 718.148281] ? __alloc_fd+0x28d/0x570 [ 718.152083] do_sys_open+0x3b3/0x520 [ 718.156582] ? filp_open+0x70/0x70 [ 718.160116] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.166096] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.171118] ? do_syscall_64+0x21/0x620 [ 718.175679] do_syscall_64+0xf9/0x620 [ 718.179480] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.185226] RIP: 0033:0x7fc739183840 [ 718.188943] Code: Bad RIP value. [ 718.192287] RSP: 002b:00007fff1e368238 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 718.200829] RAX: ffffffffffffffda RBX: 000055b62f67c5d0 RCX: 00007fc739183840 [ 718.208473] RDX: 000055b62e0e2fe3 RSI: 00000000000a0800 RDI: 000055b62f66dc20 [ 718.216107] RBP: 00007fff1e3683b0 R08: 000055b62e0e2670 R09: 0000000000000010 [ 718.223756] R10: 000055b62e0e2d0c R11: 0000000000000246 R12: 00007fff1e368300 [ 718.231034] R13: 000055b62f6828c0 R14: 0000000000000003 R15: 000000000000000e [ 718.238915] [ 718.238915] Showing all locks held in the system: [ 718.246173] 1 lock held by khungtaskd/1567: [ 718.250474] #0: 00000000cc2c8226 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.259727] 1 lock held by in:imklog/7818: [ 718.264922] #0: 00000000cebb632f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.273361] 1 lock held by syz-executor120/8104: [ 718.278108] #0: 0000000068289baa (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x520 [ 718.286586] 1 lock held by systemd-udevd/8107: [ 718.291176] #0: 0000000068289baa (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 [ 718.300030] [ 718.301662] ============================================= [ 718.301662] [ 718.309290] NMI backtrace for cpu 0 [ 718.312978] CPU: 0 PID: 1567 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0 [ 718.320457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.329792] Call Trace: [ 718.332367] dump_stack+0x1fc/0x2ef [ 718.335980] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.340473] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.344972] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.350248] watchdog+0x991/0xe60 [ 718.353703] ? reset_hung_task_detector+0x30/0x30 [ 718.358529] kthread+0x33f/0x460 [ 718.361875] ? kthread_park+0x180/0x180 [ 718.365833] ret_from_fork+0x24/0x30 [ 718.369654] Sending NMI from CPU 0 to CPUs 1: [ 718.374266] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 [ 718.375214] Kernel panic - not syncing: hung_task: blocked tasks [ 718.387959] CPU: 0 PID: 1567 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0 [ 718.395384] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.404718] Call Trace: [ 718.407306] dump_stack+0x1fc/0x2ef [ 718.410915] panic+0x26a/0x50e [ 718.414090] ? __warn_printk+0xf3/0xf3 [ 718.417962] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.422556] ? ___preempt_schedule+0x16/0x18 [ 718.426946] ? watchdog+0x991/0xe60 [ 718.430554] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.435986] watchdog+0x9a2/0xe60 [ 718.439424] ? reset_hung_task_detector+0x30/0x30 [ 718.444262] kthread+0x33f/0x460 [ 718.447609] ? kthread_park+0x180/0x180 [ 718.451569] ret_from_fork+0x24/0x30 [ 718.456100] Kernel Offset: disabled [ 718.459733] Rebooting in 86400 seconds..