[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.27' (ECDSA) to the list of known hosts.
syzkaller login: [  721.526422][ T1641] INFO: task syz-executor762:8424 can't die for more than 143 seconds.
[  721.534910][ T1641] task:syz-executor762 state:R  running task     stack:28960 pid: 8424 ppid:  8407 flags:0x00024006
[  721.549510][ T1641] Call Trace:
[  721.552812][ T1641]  ? io_poll_rewait+0x350/0x440
[  721.559202][ T1641]  ? lock_downgrade+0x6e0/0x6e0
[  721.564107][ T1641]  ? _raw_spin_lock_irqsave+0x39/0x50
[  721.571024][ T1641]  ? __wake_up_common_lock+0xd0/0x130
[  721.577460][ T1641]  ? io_poll_task_func+0x2ab/0x400
[  721.582638][ T1641]  ? io_poll_rewait+0x350/0x440
[  721.588828][ T1641]  ? __io_recvmsg_copy_hdr+0x2e0/0x2e0
[  721.594322][ T1641]  ? io_cqring_ev_posted+0x2da/0x370
[  721.600970][ T1641]  ? io_poll_task_func+0x4b/0x400
[  721.606026][ T1641]  ? tctx_task_work+0x24e/0x550
[  721.612307][ T1641]  ? task_work_run+0xdd/0x1a0
[  721.617968][ T1641]  ? exit_to_user_mode_prepare+0x221/0x250
[  721.623896][ T1641]  ? syscall_exit_to_user_mode+0x19/0x60
[  721.630887][ T1641]  ? entry_SYSCALL_64_after_hwframe+0x44/0xae
[  721.638472][ T1641] 
[  721.638472][ T1641] Showing all locks held in the system:
[  721.647092][ T1641] 1 lock held by khungtaskd/1641:
[  721.652126][ T1641]  #0: ffffffff8bf75060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260
[  721.663683][ T1641] 1 lock held by in:imklog/8122:
[  721.669659][ T1641]  #0: ffff88801da06af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100
[  721.679953][ T1641] 
[  721.682288][ T1641] =============================================
[  721.682288][ T1641] 
[  721.692575][ T1641] Kernel panic - not syncing: hung_task: blocked tasks
[  721.699428][ T1641] CPU: 0 PID: 1641 Comm: khungtaskd Not tainted 5.12.0-rc5-next-20210401-syzkaller #0
[  721.708975][ T1641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  721.719053][ T1641] Call Trace:
[  721.722337][ T1641]  dump_stack+0x141/0x1d7
[  721.726710][ T1641]  panic+0x306/0x73d
[  721.730643][ T1641]  ? __warn_printk+0xf3/0xf3
[  721.735259][ T1641]  ? watchdog.cold+0x22d/0x248
[  721.740057][ T1641]  watchdog.cold+0x23e/0x248
[  721.744658][ T1641]  ? trace_sched_process_hang+0x280/0x280
[  721.750476][ T1641]  kthread+0x3b1/0x4a0
[  721.754562][ T1641]  ? __kthread_bind_mask+0xc0/0xc0
[  721.759690][ T1641]  ret_from_fork+0x1f/0x30
[  721.764883][ T1641] Kernel Offset: disabled
[  721.769210][ T1641] Rebooting in 86400 seconds..