[ 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 '10.128.0.177' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 484.912024][ T20] Bluetooth: hci0: command 0x0409 tx timeout [ 486.991789][ T20] Bluetooth: hci0: command 0x041b tx timeout [ 489.071604][ T20] Bluetooth: hci0: command 0x040f tx timeout [ 491.151374][ T20] Bluetooth: hci0: command 0x0419 tx timeout [ 493.231148][ T20] Bluetooth: hci0: command 0x0405 tx timeout [ 605.541652][ T20] Bluetooth: hci0: command 0x0406 tx timeout [ 716.095204][ T27] INFO: task krfcommd:2893 blocked for more than 143 seconds. [ 716.102820][ T27] Not tainted 5.14.0-rc6-next-20210817-syzkaller #0 [ 716.110883][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.119679][ T27] task:krfcommd state:D stack:29112 pid: 2893 ppid: 2 flags:0x00004000 [ 716.129037][ T27] Call Trace: [ 716.132318][ T27] __schedule+0x93a/0x26f0 [ 716.137118][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.142418][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.147701][ T27] schedule+0xd3/0x270 [ 716.151794][ T27] schedule_preempt_disabled+0xf/0x20 [ 716.157422][ T27] __mutex_lock+0xa46/0x1300 [ 716.162076][ T27] ? rfcomm_run+0x2ed/0x4a20 [ 716.167034][ T27] ? mutex_lock_io_nested+0x1160/0x1160 [ 716.172620][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.177792][ T27] rfcomm_run+0x2ed/0x4a20 [ 716.182214][ T27] ? find_held_lock+0x2d/0x110 [ 716.187250][ T27] ? rfcomm_check_accept+0x240/0x240 [ 716.192545][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.197626][ T27] ? __init_waitqueue_head+0xd0/0xd0 [ 716.203099][ T27] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 716.209179][ T27] ? lockdep_hardirqs_on+0x79/0x100 [ 716.214393][ T27] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 716.221187][ T27] ? __kthread_parkme+0x15f/0x220 [ 716.226632][ T27] ? rfcomm_check_accept+0x240/0x240 [ 716.231923][ T27] kthread+0x3e5/0x4d0 [ 716.236361][ T27] ? set_kthread_struct+0x130/0x130 [ 716.241571][ T27] ret_from_fork+0x1f/0x30 [ 716.246347][ T27] INFO: task syz-executor405:6608 blocked for more than 143 seconds. [ 716.254409][ T27] Not tainted 5.14.0-rc6-next-20210817-syzkaller #0 [ 716.261704][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.270443][ T27] task:syz-executor405 state:D stack:27872 pid: 6608 ppid: 6576 flags:0x00004006 [ 716.279725][ T27] Call Trace: [ 716.283001][ T27] __schedule+0x93a/0x26f0 [ 716.287649][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.292947][ T27] ? trace_hardirqs_on+0x5b/0x1c0 [ 716.298240][ T27] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 716.305501][ T27] schedule+0xd3/0x270 [ 716.309607][ T27] __lock_sock+0x13d/0x260 [ 716.314068][ T27] ? sock_omalloc+0x180/0x180 [ 716.318995][ T27] ? __rfcomm_dlc_close+0x162/0x8a0 [ 716.324219][ T27] ? finish_wait+0x270/0x270 [ 716.329307][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.334253][ T27] lock_sock_nested+0xf6/0x120 [ 716.339242][ T27] rfcomm_sk_state_change+0xb4/0x390 [ 716.344556][ T27] __rfcomm_dlc_close+0x1b6/0x8a0 [ 716.349911][ T27] rfcomm_dlc_close+0x1ea/0x240 [ 716.354765][ T27] __rfcomm_sock_close+0xac/0x260 [ 716.360041][ T27] rfcomm_sock_shutdown+0xe9/0x210 [ 716.365239][ T27] rfcomm_sock_release+0x5f/0x140 [ 716.370268][ T27] __sock_release+0xcd/0x280 [ 716.374906][ T27] sock_close+0x18/0x20 [ 716.379296][ T27] __fput+0x288/0x9f0 [ 716.383337][ T27] ? __sock_release+0x280/0x280 [ 716.388449][ T27] task_work_run+0xdd/0x1a0 [ 716.392974][ T27] do_exit+0xbae/0x2a30 [ 716.397402][ T27] ? lock_acquire+0x442/0x510 [ 716.402103][ T27] ? rcu_read_lock_sched_held+0xd/0x70 [ 716.407897][ T27] ? lock_release+0x522/0x720 [ 716.412584][ T27] ? mm_update_next_owner+0x7a0/0x7a0 [ 716.418249][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.423109][ T27] ? do_raw_spin_lock+0x120/0x2b0 [ 716.428347][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.433297][ T27] do_group_exit+0x125/0x310 [ 716.438472][ T27] get_signal+0x47f/0x2160 [ 716.443010][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.448105][ T27] ? wake_up_q+0xf0/0xf0 [ 716.452451][ T27] arch_do_signal_or_restart+0x2a9/0x1c40 [ 716.458438][ T27] ? rfcomm_sock_connect+0x15f/0x460 [ 716.463735][ T27] ? rfcomm_sock_getname+0x300/0x300 [ 716.469243][ T27] ? __sys_connect_file+0x4e/0x1a0 [ 716.474374][ T27] ? get_sigframe_size+0x10/0x10 [ 716.479544][ T27] ? __sys_connect_file+0x1a0/0x1a0 [ 716.484765][ T27] exit_to_user_mode_prepare+0x17d/0x290 [ 716.490767][ T27] syscall_exit_to_user_mode+0x19/0x60 [ 716.496304][ T27] do_syscall_64+0x42/0xb0 [ 716.500793][ T27] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.506935][ T27] RIP: 0033:0x445fe9 [ 716.510834][ T27] RSP: 002b:00007ffcf74963a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 716.519474][ T27] RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000445fe9 [ 716.527852][ T27] RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004 [ 716.535890][ T27] RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 [ 716.543972][ T27] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000a3c2b8 [ 716.552010][ T27] R13: 0000000000000072 R14: 00007ffcf7496400 R15: 0000000000000003 [ 716.560173][ T27] INFO: lockdep is turned off. [ 716.564922][ T27] NMI backtrace for cpu 1 [ 716.569231][ T27] CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc6-next-20210817-syzkaller #0 [ 716.578596][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.588637][ T27] Call Trace: [ 716.591906][ T27] dump_stack_lvl+0xcd/0x134 [ 716.596634][ T27] nmi_cpu_backtrace.cold+0x47/0x144 [ 716.601939][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.607201][ T27] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 716.613215][ T27] watchdog+0xcb7/0xed0 [ 716.617377][ T27] ? trace_sched_process_hang+0x280/0x280 [ 716.623126][ T27] kthread+0x3e5/0x4d0 [ 716.627191][ T27] ? set_kthread_struct+0x130/0x130 [ 716.632391][ T27] ret_from_fork+0x1f/0x30 [ 716.636937][ T27] Sending NMI from CPU 1 to CPUs 0: [ 716.642166][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 [ 716.645011][ T27] Kernel panic - not syncing: hung_task: blocked tasks [ 716.658707][ T27] CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc6-next-20210817-syzkaller #0 [ 716.668222][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.678304][ T27] Call Trace: [ 716.681712][ T27] dump_stack_lvl+0xcd/0x134 [ 716.686386][ T27] panic+0x2b0/0x6dd [ 716.690295][ T27] ? __warn_printk+0xf3/0xf3 [ 716.695048][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.700230][ T27] ? preempt_schedule_thunk+0x16/0x18 [ 716.705591][ T27] ? nmi_trigger_cpumask_backtrace+0x191/0x220 [ 716.711727][ T27] ? watchdog.cold+0x1b9/0x1de [ 716.716499][ T27] watchdog.cold+0x1ca/0x1de [ 716.721078][ T27] ? trace_sched_process_hang+0x280/0x280 [ 716.726780][ T27] kthread+0x3e5/0x4d0 [ 716.730845][ T27] ? set_kthread_struct+0x130/0x130 [ 716.736035][ T27] ret_from_fork+0x1f/0x30 [ 716.741823][ T27] Kernel Offset: disabled [ 716.746134][ T27] Rebooting in 86400 seconds..