[ 51.759667][ T4584] R10: 00005567ee6fcd0c R11: 0000000000000246 R12: 00007fffc32aad30 [ 51.759688][ T4584] R13: 00005567eea61880 R14: 0000000000000003 R15: 000000000000000e [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 112.389441][ T6546] cron (6546) used greatest stack depth: 22728 bytes left Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. executing program [ 484.569971][ T6269] Bluetooth: hci0: command 0x0409 tx timeout [ 486.649730][ T6269] Bluetooth: hci0: command 0x041b tx timeout [ 488.729539][ T6269] Bluetooth: hci0: command 0x040f tx timeout [ 490.809300][ T6269] Bluetooth: hci0: command 0x0419 tx timeout [ 492.889086][ T6269] Bluetooth: hci0: command 0x0405 tx timeout [ 605.679345][ T6269] Bluetooth: hci0: command 0x0406 tx timeout [ 716.232856][ T27] INFO: task krfcommd:2894 blocked for more than 143 seconds. [ 716.240331][ T27] Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 [ 716.248403][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.257165][ T27] task:krfcommd state:D stack:28672 pid: 2894 ppid: 2 flags:0x00004000 [ 716.266447][ T27] Call Trace: [ 716.269732][ T27] __schedule+0x93a/0x26f0 [ 716.274511][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.279814][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.285096][ T27] schedule+0xd3/0x270 [ 716.289176][ T27] schedule_preempt_disabled+0xf/0x20 [ 716.294837][ T27] __mutex_lock+0xa46/0x1300 [ 716.299612][ T27] ? rfcomm_run+0x2ed/0x4a20 [ 716.304574][ T27] ? mutex_lock_io_nested+0x1160/0x1160 [ 716.310138][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.315268][ T27] rfcomm_run+0x2ed/0x4a20 [ 716.319712][ T27] ? find_held_lock+0x2d/0x110 [ 716.324788][ T27] ? rfcomm_check_accept+0x240/0x240 [ 716.330080][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.335195][ T27] ? __init_waitqueue_head+0xd0/0xd0 [ 716.340491][ T27] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 716.346626][ T27] ? lockdep_hardirqs_on+0x79/0x100 [ 716.351906][ T27] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 716.358460][ T27] ? __kthread_parkme+0x15f/0x220 [ 716.363664][ T27] ? rfcomm_check_accept+0x240/0x240 [ 716.368963][ T27] kthread+0x3e5/0x4d0 [ 716.373274][ T27] ? set_kthread_struct+0x130/0x130 [ 716.378508][ T27] ret_from_fork+0x1f/0x30 [ 716.383316][ T27] INFO: task syz-executor841:6587 blocked for more than 143 seconds. [ 716.391377][ T27] Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 [ 716.398694][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.407412][ T27] task:syz-executor841 state:D stack:28184 pid: 6587 ppid: 6555 flags:0x00004006 [ 716.416713][ T27] Call Trace: [ 716.419989][ T27] __schedule+0x93a/0x26f0 [ 716.424643][ T27] ? io_schedule_timeout+0x140/0x140 [ 716.429938][ T27] ? trace_hardirqs_on+0x5b/0x1c0 [ 716.435245][ T27] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 716.441059][ T27] schedule+0xd3/0x270 [ 716.445710][ T27] __lock_sock+0x13d/0x260 [ 716.450203][ T27] ? sock_omalloc+0x180/0x180 [ 716.455105][ T27] ? __rfcomm_dlc_close+0x162/0x8a0 [ 716.460356][ T27] ? finish_wait+0x270/0x270 [ 716.465244][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.470192][ T27] lock_sock_nested+0xf6/0x120 [ 716.475323][ T27] rfcomm_sk_state_change+0xb4/0x390 [ 716.480620][ T27] __rfcomm_dlc_close+0x1b6/0x8a0 [ 716.485933][ T27] rfcomm_dlc_close+0x1ea/0x240 [ 716.490810][ T27] __rfcomm_sock_close+0xac/0x260 [ 716.496153][ T27] rfcomm_sock_shutdown+0xe9/0x210 [ 716.501321][ T27] rfcomm_sock_release+0x5f/0x140 [ 716.506718][ T27] __sock_release+0xcd/0x280 [ 716.511380][ T27] sock_close+0x18/0x20 [ 716.515805][ T27] __fput+0x288/0x9f0 [ 716.519856][ T27] ? __sock_release+0x280/0x280 [ 716.525014][ T27] task_work_run+0xdd/0x1a0 [ 716.529545][ T27] do_exit+0xbd4/0x2a60 [ 716.533996][ T27] ? lock_acquire+0x442/0x510 [ 716.538677][ T27] ? rcu_read_lock_sched_held+0xd/0x70 [ 716.544424][ T27] ? lock_release+0x522/0x720 [ 716.549111][ T27] ? mm_update_next_owner+0x7a0/0x7a0 [ 716.554739][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.559615][ T27] ? do_raw_spin_lock+0x120/0x2b0 [ 716.564884][ T27] ? rwlock_bug.part.0+0x90/0x90 [ 716.569828][ T27] do_group_exit+0x125/0x310 [ 716.574663][ T27] get_signal+0x47f/0x2160 [ 716.579136][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 716.584619][ T27] ? wake_up_q+0xf0/0xf0 [ 716.588922][ T27] arch_do_signal_or_restart+0x2a9/0x1c40 [ 716.594939][ T27] ? rfcomm_sock_connect+0x15f/0x460 [ 716.600233][ T27] ? rfcomm_sock_getname+0x300/0x300 [ 716.605751][ T27] ? __sys_connect_file+0x4e/0x1a0 [ 716.610876][ T27] ? get_sigframe_size+0x10/0x10 [ 716.616066][ T27] ? __sys_connect_file+0x1a0/0x1a0 [ 716.621280][ T27] exit_to_user_mode_prepare+0x17d/0x290 [ 716.627233][ T27] syscall_exit_to_user_mode+0x19/0x60 [ 716.632761][ T27] do_syscall_64+0x42/0xb0 [ 716.637258][ T27] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 716.643212][ T27] RIP: 0033:0x445fe9 [ 716.647100][ T27] RSP: 002b:00007ffe65f10e78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 716.655529][ T27] RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000445fe9 [ 716.663561][ T27] RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004 [ 716.671529][ T27] RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 [ 716.680144][ T27] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001e8d2b8 [ 716.688478][ T27] R13: 0000000000000072 R14: 00007ffe65f10ed0 R15: 0000000000000003 [ 716.697009][ T27] INFO: lockdep is turned off. [ 716.701756][ T27] NMI backtrace for cpu 1 [ 716.706055][ T27] CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 [ 716.715397][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.725428][ T27] Call Trace: [ 716.728689][ T27] dump_stack_lvl+0xcd/0x134 [ 716.733333][ T27] nmi_cpu_backtrace.cold+0x47/0x144 [ 716.738600][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.743815][ T27] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 716.749805][ T27] watchdog+0xcb7/0xed0 [ 716.753960][ T27] ? trace_sched_process_hang+0x280/0x280 [ 716.759662][ T27] kthread+0x3e5/0x4d0 [ 716.763710][ T27] ? set_kthread_struct+0x130/0x130 [ 716.768887][ T27] ret_from_fork+0x1f/0x30 [ 716.773332][ T27] Sending NMI from CPU 1 to CPUs 0: [ 716.778526][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 [ 716.791368][ T27] Kernel panic - not syncing: hung_task: blocked tasks [ 716.798201][ T27] CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 [ 716.807546][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.817580][ T27] Call Trace: [ 716.821001][ T27] dump_stack_lvl+0xcd/0x134 [ 716.825593][ T27] panic+0x2b0/0x6dd [ 716.829508][ T27] ? __warn_printk+0xf3/0xf3 [ 716.834082][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.839267][ T27] ? preempt_schedule_thunk+0x16/0x18 [ 716.844630][ T27] ? nmi_trigger_cpumask_backtrace+0x191/0x220 [ 716.850775][ T27] ? watchdog.cold+0x1b9/0x1de [ 716.855686][ T27] watchdog.cold+0x1ca/0x1de [ 716.860273][ T27] ? trace_sched_process_hang+0x280/0x280 [ 716.865981][ T27] kthread+0x3e5/0x4d0 [ 716.870036][ T27] ? set_kthread_struct+0x130/0x130 [ 716.875224][ T27] ret_from_fork+0x1f/0x30 [ 716.880960][ T27] Kernel Offset: disabled [ 716.885280][ T27] Rebooting in 86400 seconds..