[ 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 '10.128.0.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 487.931928][ T5] Bluetooth: hci0: command 0x0409 tx timeout [ 490.011564][ T5] Bluetooth: hci0: command 0x041b tx timeout [ 492.091379][ T5] Bluetooth: hci0: command 0x040f tx timeout [ 494.170992][ T5] Bluetooth: hci0: command 0x0419 tx timeout [ 496.250601][ T5] Bluetooth: hci0: command 0x0405 tx timeout [ 610.717330][ T5] Bluetooth: hci0: command 0x0406 tx timeout [ 716.148863][ T26] INFO: task krfcommd:2891 blocked for more than 143 seconds. [ 716.156337][ T26] Not tainted 5.14.0-rc5-next-20210813-syzkaller #0 [ 716.164375][ T26] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.173128][ T26] task:krfcommd state:D stack:28952 pid: 2891 ppid: 2 flags:0x00004000 [ 716.182434][ T26] Call Trace: [ 716.185728][ T26] __schedule+0x93a/0x26f0 [ 716.190576][ T26] ? io_schedule_timeout+0x140/0x140 [ 716.195880][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 716.201149][ T26] schedule+0xd3/0x270 [ 716.205234][ T26] schedule_preempt_disabled+0xf/0x20 [ 716.210910][ T26] __mutex_lock+0xa46/0x1300 [ 716.215521][ T26] ? rfcomm_run+0x2ed/0x4a20 [ 716.220611][ T26] ? mutex_lock_io_nested+0x1160/0x1160 [ 716.226193][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.231477][ T26] rfcomm_run+0x2ed/0x4a20 [ 716.236037][ T26] ? find_held_lock+0x2d/0x110 [ 716.241086][ T26] ? rfcomm_check_accept+0x240/0x240 [ 716.246389][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.251551][ T26] ? __init_waitqueue_head+0xd0/0xd0 [ 716.256915][ T26] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 716.262994][ T26] ? lockdep_hardirqs_on+0x79/0x100 [ 716.268214][ T26] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 716.275073][ T26] ? __kthread_parkme+0x15f/0x220 [ 716.280496][ T26] ? rfcomm_check_accept+0x240/0x240 [ 716.285835][ T26] kthread+0x3e5/0x4d0 [ 716.290171][ T26] ? set_kthread_struct+0x130/0x130 [ 716.295385][ T26] ret_from_fork+0x1f/0x30 [ 716.300167][ T26] INFO: task syz-executor547:6614 blocked for more than 143 seconds. [ 716.308230][ T26] Not tainted 5.14.0-rc5-next-20210813-syzkaller #0 [ 716.315572][ T26] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.324302][ T26] task:syz-executor547 state:D stack:27864 pid: 6614 ppid: 6583 flags:0x00004006 [ 716.333590][ T26] Call Trace: [ 716.336874][ T26] __schedule+0x93a/0x26f0 [ 716.341574][ T26] ? io_schedule_timeout+0x140/0x140 [ 716.346877][ T26] ? trace_hardirqs_on+0x5b/0x1c0 [ 716.352238][ T26] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 716.358060][ T26] schedule+0xd3/0x270 [ 716.362381][ T26] __lock_sock+0x13d/0x260 [ 716.366869][ T26] ? sock_omalloc+0x180/0x180 [ 716.371786][ T26] ? __rfcomm_dlc_close+0x162/0x8a0 [ 716.377055][ T26] ? finish_wait+0x270/0x270 [ 716.382050][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 716.387006][ T26] lock_sock_nested+0xf6/0x120 [ 716.392149][ T26] rfcomm_sk_state_change+0xb4/0x390 [ 716.397464][ T26] __rfcomm_dlc_close+0x1b6/0x8a0 [ 716.402772][ T26] rfcomm_dlc_close+0x1ea/0x240 [ 716.407631][ T26] __rfcomm_sock_close+0xac/0x260 [ 716.412909][ T26] rfcomm_sock_shutdown+0xe9/0x210 [ 716.418032][ T26] rfcomm_sock_release+0x5f/0x140 [ 716.423317][ T26] __sock_release+0xcd/0x280 [ 716.427988][ T26] sock_close+0x18/0x20 [ 716.432423][ T26] __fput+0x288/0x9f0 [ 716.436492][ T26] ? __sock_release+0x280/0x280 [ 716.441617][ T26] task_work_run+0xdd/0x1a0 [ 716.446132][ T26] do_exit+0xbae/0x2a30 [ 716.450606][ T26] ? lock_acquire+0x442/0x510 [ 716.455317][ T26] ? rcu_read_lock_sched_held+0xd/0x70 [ 716.461235][ T26] ? lock_release+0x522/0x720 [ 716.465925][ T26] ? mm_update_next_owner+0x7a0/0x7a0 [ 716.471591][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.476455][ T26] ? do_raw_spin_lock+0x120/0x2b0 [ 716.481747][ T26] ? rwlock_bug.part.0+0x90/0x90 [ 716.486705][ T26] do_group_exit+0x125/0x310 [ 716.491572][ T26] get_signal+0x47f/0x2160 [ 716.496073][ T26] ? lock_downgrade+0x6e0/0x6e0 [ 716.501208][ T26] ? wake_up_q+0xf0/0xf0 [ 716.505514][ T26] arch_do_signal_or_restart+0x2a9/0x1c40 [ 716.511521][ T26] ? rfcomm_sock_connect+0x15f/0x460 [ 716.516817][ T26] ? rfcomm_sock_getname+0x300/0x300 [ 716.522357][ T26] ? __sys_connect_file+0x4e/0x1a0 [ 716.527487][ T26] ? get_sigframe_size+0x10/0x10 [ 716.532696][ T26] ? __sys_connect_file+0x1a0/0x1a0 [ 716.537914][ T26] exit_to_user_mode_prepare+0x17d/0x290 [ 716.543932][ T26] syscall_exit_to_user_mode+0x19/0x60 [ 716.549701][ T26] do_syscall_64+0x42/0xb0 [ 716.554150][ T26] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.560365][ T26] RIP: 0033:0x446009 [ 716.564262][ T26] RSP: 002b:00007ffe6072c648 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 716.572926][ T26] RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000446009 [ 716.580966][ T26] RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004 [ 716.589018][ T26] RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 [ 716.596993][ T26] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000016782b8 [ 716.605246][ T26] R13: 0000000000000009 R14: 00007ffe6072c6a0 R15: 0000000000000003 [ 716.613367][ T26] INFO: lockdep is turned off. [ 716.618129][ T26] NMI backtrace for cpu 1 [ 716.622441][ T26] CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210813-syzkaller #0 [ 716.631807][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.641856][ T26] Call Trace: [ 716.645126][ T26] dump_stack_lvl+0xcd/0x134 [ 716.649751][ T26] nmi_cpu_backtrace.cold+0x47/0x144 [ 716.655033][ T26] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.660283][ T26] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 716.666295][ T26] watchdog+0xcb7/0xed0 [ 716.670448][ T26] ? trace_sched_process_hang+0x280/0x280 [ 716.676168][ T26] kthread+0x3e5/0x4d0 [ 716.680236][ T26] ? set_kthread_struct+0x130/0x130 [ 716.685431][ T26] ret_from_fork+0x1f/0x30 [ 716.690029][ T26] Sending NMI from CPU 1 to CPUs 0: [ 716.695252][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 [ 716.696366][ T26] Kernel panic - not syncing: hung_task: blocked tasks [ 716.711826][ T26] CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210813-syzkaller #0 [ 716.721171][ T26] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.731201][ T26] Call Trace: [ 716.734466][ T26] dump_stack_lvl+0xcd/0x134 [ 716.739042][ T26] panic+0x2b0/0x6dd [ 716.742946][ T26] ? __warn_printk+0xf3/0xf3 [ 716.747515][ T26] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.752699][ T26] ? preempt_schedule_thunk+0x16/0x18 [ 716.758060][ T26] ? nmi_trigger_cpumask_backtrace+0x191/0x220 [ 716.764209][ T26] ? watchdog.cold+0x1b9/0x1de [ 716.768995][ T26] watchdog.cold+0x1ca/0x1de [ 716.773577][ T26] ? trace_sched_process_hang+0x280/0x280 [ 716.779290][ T26] kthread+0x3e5/0x4d0 [ 716.783345][ T26] ? set_kthread_struct+0x130/0x130 [ 716.788527][ T26] ret_from_fork+0x1f/0x30 [ 716.794207][ T26] Kernel Offset: disabled [ 716.798516][ T26] Rebooting in 86400 seconds..