[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.142' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 481.608990][ T5] Bluetooth: hci0: command 0x0409 tx timeout [ 483.688723][ T5] Bluetooth: hci0: command 0x041b tx timeout [ 485.768432][ T5] Bluetooth: hci0: command 0x040f tx timeout [ 487.848100][ T5] Bluetooth: hci0: command 0x0419 tx timeout [ 489.927782][ T5] Bluetooth: hci0: command 0x0405 tx timeout [ 605.514294][ T5] Bluetooth: hci0: command 0x0406 tx timeout [ 716.065407][ T27] INFO: task krfcommd:2895 blocked for more than 143 seconds. [ 716.073130][ T27] Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.080332][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.089063][ T27] task:krfcommd state:D stack:29640 pid: 2895 ppid: 2 flags:0x00004000 [ 716.098542][ T27] Call Trace: [ 716.101828][ T27] __schedule+0x93a/0x26f0 [ 716.106635][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.111932][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.117201][ T27] schedule+0xd3/0x270 [ 716.121279][ T27] schedule_preempt_disabled+0xf/0x20 [ 716.126973][ T27] __mutex_lock+0xa46/0x1300 [ 716.131576][ T27] ? rfcomm_run+0x2ed/0x4a20 [ 716.136501][ T27] ? mutex_lock_io_nested+0x1160/0x1160 [ 716.142064][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.147251][ T27] rfcomm_run+0x2ed/0x4a20 [ 716.152111][ T27] ? find_held_lock+0x2d/0x110 [ 716.157190][ T27] ? rfcomm_check_accept+0x240/0x240 [ 716.162489][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.167573][ T27] ? __init_waitqueue_head+0xd0/0xd0 [ 716.172911][ T27] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 716.179060][ T27] ? lockdep_hardirqs_on+0x79/0x100 [ 716.184339][ T27] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 716.190912][ T27] ? __kthread_parkme+0x15f/0x220 [ 716.196204][ T27] ? rfcomm_check_accept+0x240/0x240 [ 716.201502][ T27] kthread+0x3e5/0x4d0 [ 716.205777][ T27] ? set_kthread_struct+0x130/0x130 [ 716.211203][ T27] ret_from_fork+0x1f/0x30 [ 716.215832][ T27] INFO: task syz-executor247:6597 blocked for more than 143 seconds. [ 716.223891][ T27] Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.231191][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.239908][ T27] task:syz-executor247 state:D stack:27600 pid: 6597 ppid: 6565 flags:0x00004006 [ 716.249329][ T27] Call Trace: [ 716.252595][ T27] __schedule+0x93a/0x26f0 [ 716.257054][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.262347][ T27] ? trace_hardirqs_on+0x5b/0x1c0 [ 716.267445][ T27] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 716.273256][ T27] schedule+0xd3/0x270 [ 716.277407][ T27] __lock_sock+0x13d/0x260 [ 716.281879][ T27] ? sock_omalloc+0x180/0x180 [ 716.286574][ T27] ? __rfcomm_dlc_close+0x162/0x8a0 [ 716.291779][ T27] ? finish_wait+0x270/0x270 [ 716.296416][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.301377][ T27] lock_sock_nested+0xf6/0x120 [ 716.306165][ T27] rfcomm_sk_state_change+0xb4/0x390 [ 716.311466][ T27] __rfcomm_dlc_close+0x1b6/0x8a0 [ 716.316562][ T27] rfcomm_dlc_close+0x1ea/0x240 [ 716.321447][ T27] __rfcomm_sock_close+0xac/0x260 [ 716.326496][ T27] rfcomm_sock_shutdown+0xe9/0x210 [ 716.331607][ T27] rfcomm_sock_release+0x5f/0x140 [ 716.336715][ T27] __sock_release+0xcd/0x280 [ 716.341358][ T27] sock_close+0x18/0x20 [ 716.345545][ T27] __fput+0x288/0x920 [ 716.349590][ T27] ? __sock_release+0x280/0x280 [ 716.354427][ T27] task_work_run+0xdd/0x1a0 [ 716.359123][ T27] do_exit+0xbd4/0x2a60 [ 716.363327][ T27] ? lock_acquire+0x442/0x510 [ 716.368024][ T27] ? rcu_read_lock_sched_held+0xd/0x70 [ 716.373535][ T27] ? lock_release+0x522/0x720 [ 716.378272][ T27] ? mm_update_next_owner+0x7a0/0x7a0 [ 716.383671][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.388541][ T27] ? do_raw_spin_lock+0x120/0x2b0 [ 716.393563][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.398564][ T27] do_group_exit+0x125/0x310 [ 716.403252][ T27] get_signal+0x47f/0x2160 [ 716.407722][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.412570][ T27] ? wake_up_q+0xf0/0xf0 [ 716.416924][ T27] arch_do_signal_or_restart+0x2a9/0x1c40 [ 716.422696][ T27] ? rfcomm_sock_connect+0x15f/0x460 [ 716.428000][ T27] ? rfcomm_sock_getname+0x300/0x300 [ 716.433291][ T27] ? __sys_connect_file+0x4e/0x1a0 [ 716.438900][ T27] ? get_sigframe_size+0x10/0x10 [ 716.443839][ T27] ? __sys_connect_file+0x1a0/0x1a0 [ 716.449077][ T27] exit_to_user_mode_prepare+0x17d/0x290 [ 716.454766][ T27] syscall_exit_to_user_mode+0x19/0x60 [ 716.460305][ T27] do_syscall_64+0x42/0xb0 [ 716.464729][ T27] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.470721][ T27] RIP: 0033:0x446009 [ 716.474610][ T27] RSP: 002b:00007ffda734ed78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 716.483070][ T27] RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000446009 [ 716.491067][ T27] RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004 [ 716.499083][ T27] RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 [ 716.507086][ T27] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001dee2b8 [ 716.515047][ T27] R13: 0000000000000072 R14: 00007ffda734edd0 R15: 0000000000000003 [ 716.523104][ T27] INFO: lockdep is turned off. [ 716.527882][ T27] NMI backtrace for cpu 0 [ 716.532191][ T27] CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.541537][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.551920][ T27] Call Trace: [ 716.555182][ T27] dump_stack_lvl+0xcd/0x134 [ 716.559813][ T27] nmi_cpu_backtrace.cold+0x47/0x144 [ 716.565075][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.570302][ T27] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 716.576306][ T27] watchdog+0xcb7/0xed0 [ 716.580440][ T27] ? trace_sched_process_hang+0x280/0x280 [ 716.586138][ T27] kthread+0x3e5/0x4d0 [ 716.590187][ T27] ? set_kthread_struct+0x130/0x130 [ 716.595366][ T27] ret_from_fork+0x1f/0x30 [ 716.599858][ T27] Sending NMI from CPU 0 to CPUs 1: [ 716.605077][ C1] NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 [ 716.606075][ T27] Kernel panic - not syncing: hung_task: blocked tasks [ 716.620636][ T27] CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.629991][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.640297][ T27] Call Trace: [ 716.643566][ T27] dump_stack_lvl+0xcd/0x134 [ 716.648161][ T27] panic+0x2b0/0x6dd [ 716.652077][ T27] ? __warn_printk+0xf3/0xf3 [ 716.656661][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.661854][ T27] ? preempt_schedule_thunk+0x16/0x18 [ 716.667218][ T27] ? nmi_trigger_cpumask_backtrace+0x191/0x220 [ 716.673375][ T27] ? watchdog.cold+0x1b9/0x1de [ 716.678146][ T27] watchdog.cold+0x1ca/0x1de [ 716.682737][ T27] ? trace_sched_process_hang+0x280/0x280 [ 716.688447][ T27] kthread+0x3e5/0x4d0 [ 716.692504][ T27] ? set_kthread_struct+0x130/0x130 [ 716.697694][ T27] ret_from_fork+0x1f/0x30 [ 716.703239][ T27] Kernel Offset: disabled [ 716.707547][ T27] Rebooting in 86400 seconds..