INFO: task syz-executor.3:12022 blocked for more than 143 seconds.
      Not tainted 5.15.160-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:27168 pid:12022 ppid: 11267 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518
 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 unregister_netdev+0x79/0x210 net/core/dev.c:11151
 mkiss_close+0x147/0x1e0 drivers/net/hamradio/mkiss.c:797
 tty_ldisc_kill+0xa6/0x1a0 drivers/tty/tty_ldisc.c:629
 tty_ldisc_release+0x170/0x200 drivers/tty/tty_ldisc.c:803
 tty_release_struct+0x27/0xd0 drivers/tty/tty_io.c:1708