INFO: task kworker/1:1:20241 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1     state:D stack:28432 pid:20241 ppid:     2 flags:0x00004000
Workqueue: events free_ipc
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6253
 schedule+0xd2/0x260 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0x634/0x1110 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write_common kernel/locking/rwsem.c:1265 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x135/0x150 kernel/locking/rwsem.c:1524
 unregister_shrinker mm/vmscan.c:678 [inline]
 unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673
 deactivate_locked_super+0x6c/0x160 fs/super.c:334
 deactivate_super+0xad/0xd0 fs/super.c:366
 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1137
 mntput_no_expire+0x908/0xcd0 fs/namespace.c:1223
 mntput fs/namespace.c:1233 [inline]
 kern_unmount fs/namespace.c:4369 [inline]
 kern_unmount+0xb5/0xe0 fs/namespace.c:4363
 free_ipc_ns ipc/namespace.c:123 [inline]
 free_ipc+0xf0/0x200 ipc/namespace.c:141
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298