[ 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 '10.128.0.108' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 483.266811][ T1282] Bluetooth: hci0: command 0x0409 tx timeout [ 485.346610][ T1282] Bluetooth: hci0: command 0x041b tx timeout [ 487.426400][ T1282] Bluetooth: hci0: command 0x040f tx timeout [ 489.506148][ T1282] Bluetooth: hci0: command 0x0419 tx timeout [ 491.585939][ T1282] Bluetooth: hci0: command 0x0405 tx timeout [ 605.576501][ T1282] Bluetooth: hci0: command 0x0406 tx timeout [ 716.130195][ T26] INFO: task krfcommd:2894 blocked for more than 143 seconds. [ 716.137676][ T26] Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.145651][ T26] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.154434][ T26] task:krfcommd state:D stack:29224 pid: 2894 ppid: 2 flags:0x00004000 [ 716.163739][ T26] Call Trace: [ 716.167038][ T26] __schedule+0x93a/0x26f0 [ 716.171847][ T26] ? io_schedule_timeout+0x140/0x140 [ 716.177145][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 716.182507][ T26] schedule+0xd3/0x270 [ 716.186584][ T26] schedule_preempt_disabled+0xf/0x20 [ 716.192227][ T26] __mutex_lock+0xa46/0x1300 [ 716.196828][ T26] ? rfcomm_run+0x2ed/0x4a20 [ 716.201722][ T26] ? mutex_lock_io_nested+0x1160/0x1160 [ 716.207326][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.212529][ T26] rfcomm_run+0x2ed/0x4a20 [ 716.216967][ T26] ? find_held_lock+0x2d/0x110 [ 716.221993][ T26] ? rfcomm_check_accept+0x240/0x240 [ 716.227291][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.232361][ T26] ? __init_waitqueue_head+0xd0/0xd0 [ 716.237718][ T26] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 716.243797][ T26] ? lockdep_hardirqs_on+0x79/0x100 [ 716.249114][ T26] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 716.256001][ T26] ? __kthread_parkme+0x15f/0x220 [ 716.261150][ T26] ? rfcomm_check_accept+0x240/0x240 [ 716.266445][ T26] kthread+0x3e5/0x4d0 [ 716.270941][ T26] ? set_kthread_struct+0x130/0x130 [ 716.276161][ T26] ret_from_fork+0x1f/0x30 [ 716.280860][ T26] INFO: task syz-executor834:6606 blocked for more than 143 seconds. [ 716.288928][ T26] Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.296231][ T26] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.304944][ T26] task:syz-executor834 state:D stack:27704 pid: 6606 ppid: 6574 flags:0x00004006 [ 716.314228][ T26] Call Trace: [ 716.317553][ T26] __schedule+0x93a/0x26f0 [ 716.322215][ T26] ? io_schedule_timeout+0x140/0x140 [ 716.327518][ T26] ? trace_hardirqs_on+0x5b/0x1c0 [ 716.332824][ T26] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 716.338648][ T26] schedule+0xd3/0x270 [ 716.342932][ T26] __lock_sock+0x13d/0x260 [ 716.347422][ T26] ? sock_omalloc+0x180/0x180 [ 716.352337][ T26] ? __rfcomm_dlc_close+0x162/0x8a0 [ 716.357579][ T26] ? finish_wait+0x270/0x270 [ 716.362689][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 716.367642][ T26] lock_sock_nested+0xf6/0x120 [ 716.372688][ T26] rfcomm_sk_state_change+0xb4/0x390 [ 716.377987][ T26] __rfcomm_dlc_close+0x1b6/0x8a0 [ 716.383234][ T26] rfcomm_dlc_close+0x1ea/0x240 [ 716.388117][ T26] __rfcomm_sock_close+0xac/0x260 [ 716.393445][ T26] rfcomm_sock_shutdown+0xe9/0x210 [ 716.398569][ T26] rfcomm_sock_release+0x5f/0x140 [ 716.403821][ T26] __sock_release+0xcd/0x280 [ 716.408482][ T26] sock_close+0x18/0x20 [ 716.412962][ T26] __fput+0x288/0x920 [ 716.417005][ T26] ? __sock_release+0x280/0x280 [ 716.422094][ T26] task_work_run+0xdd/0x1a0 [ 716.426612][ T26] do_exit+0xbd4/0x2a60 [ 716.431048][ T26] ? lock_acquire+0x442/0x510 [ 716.435733][ T26] ? rcu_read_lock_sched_held+0xd/0x70 [ 716.441469][ T26] ? lock_release+0x522/0x720 [ 716.446164][ T26] ? mm_update_next_owner+0x7a0/0x7a0 [ 716.451823][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.456686][ T26] ? do_raw_spin_lock+0x120/0x2b0 [ 716.461957][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 716.466897][ T26] do_group_exit+0x125/0x310 [ 716.471847][ T26] get_signal+0x47f/0x2160 [ 716.476326][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.481407][ T26] ? wake_up_q+0xf0/0xf0 [ 716.485726][ T26] arch_do_signal_or_restart+0x2a9/0x1c40 [ 716.491723][ T26] ? rfcomm_sock_connect+0x15f/0x460 [ 716.497025][ T26] ? rfcomm_sock_getname+0x300/0x300 [ 716.502513][ T26] ? __sys_connect_file+0x4e/0x1a0 [ 716.507648][ T26] ? get_sigframe_size+0x10/0x10 [ 716.512847][ T26] ? __sys_connect_file+0x1a0/0x1a0 [ 716.518061][ T26] exit_to_user_mode_prepare+0x17d/0x290 [ 716.523990][ T26] syscall_exit_to_user_mode+0x19/0x60 [ 716.529478][ T26] do_syscall_64+0x42/0xb0 [ 716.534277][ T26] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.540398][ T26] RIP: 0033:0x445fe9 [ 716.544383][ T26] RSP: 002b:00007ffd4f014088 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 716.553016][ T26] RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000445fe9 [ 716.561053][ T26] RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004 [ 716.569023][ T26] RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 [ 716.577214][ T26] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000019992b8 [ 716.585465][ T26] R13: 0000000000000072 R14: 00007ffd4f0140e0 R15: 0000000000000003 [ 716.593485][ T26] INFO: lockdep is turned off. [ 716.598229][ T26] NMI backtrace for cpu 0 [ 716.602530][ T26] CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.611871][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.621902][ T26] Call Trace: [ 716.625159][ T26] dump_stack_lvl+0xcd/0x134 [ 716.629796][ T26] nmi_cpu_backtrace.cold+0x47/0x144 [ 716.635070][ T26] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.640640][ T26] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 716.646652][ T26] watchdog+0xcb7/0xed0 [ 716.650792][ T26] ? trace_sched_process_hang+0x280/0x280 [ 716.656493][ T26] kthread+0x3e5/0x4d0 [ 716.660546][ T26] ? set_kthread_struct+0x130/0x130 [ 716.665726][ T26] ret_from_fork+0x1f/0x30 [ 716.670187][ T26] Sending NMI from CPU 0 to CPUs 1: [ 716.675400][ C1] NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 [ 716.676384][ T26] Kernel panic - not syncing: hung_task: blocked tasks [ 716.691836][ T26] CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210811-syzkaller #0 [ 716.701189][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.711221][ T26] Call Trace: [ 716.714480][ T26] dump_stack_lvl+0xcd/0x134 [ 716.719061][ T26] panic+0x2b0/0x6dd [ 716.722960][ T26] ? __warn_printk+0xf3/0xf3 [ 716.727542][ T26] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.732722][ T26] ? preempt_schedule_thunk+0x16/0x18 [ 716.738072][ T26] ? nmi_trigger_cpumask_backtrace+0x191/0x220 [ 716.744208][ T26] ? watchdog.cold+0x1b9/0x1de [ 716.748988][ T26] watchdog.cold+0x1ca/0x1de [ 716.753560][ T26] ? trace_sched_process_hang+0x280/0x280 [ 716.759260][ T26] kthread+0x3e5/0x4d0 [ 716.763309][ T26] ? set_kthread_struct+0x130/0x130 [ 716.768488][ T26] ret_from_fork+0x1f/0x30 [ 716.774322][ T26] Kernel Offset: disabled [ 716.778628][ T26] Rebooting in 86400 seconds..