INFO: task kworker/u9:0:53 blocked for more than 159 seconds.
      Not tainted 6.9.0-syzkaller-12400-g6fbf71854e2d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u9:0    state:D stack:25112 pid:53    tgid:53    ppid:2      flags:0x00004000
Workqueue: hci1 hci_cmd_sync_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
 kobject_uevent_net_broadcast+0x280/0x580 lib/kobject_uevent.c:410
 kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:593
 device_del+0x7db/0x9b0 drivers/base/core.c:3928
 device_unregister+0x20/0xc0 drivers/base/core.c:3951
 hci_conn_cleanup net/bluetooth/hci_conn.c:176 [inline]
 hci_conn_del+0x8c4/0xc40 net/bluetooth/hci_conn.c:1154