device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
INFO: task kworker/1:3:7800 blocked for more than 140 seconds.
      Not tainted 4.19.88-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:3     D26272  7800      2 0x80000000
Workqueue: events ser_release
Call Trace:
 context_switch kernel/sched/core.c:2826 [inline]
 __schedule+0x866/0x1dc0 kernel/sched/core.c:3515
 schedule+0x92/0x1c0 kernel/sched/core.c:3559
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77
 netdev_run_todo+0x4d4/0x7a0 net/core/dev.c:8812
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:117
 ser_release+0x1e6/0x290 drivers/net/caif/caif_serial.c:324
 process_one_work+0x989/0x1750 kernel/workqueue.c:2153
 process_scheduled_works kernel/workqueue.c:2212 [inline]
 worker_thread+0x7be/0xe40 kernel/workqueue.c:2298
 kthread+0x354/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/1:5:15936 blocked for more than 140 seconds.
      Not tainted 4.19.88-syzkaller #0