INFO: task khugepaged:33 blocked for more than 154 seconds.
      Not tainted 5.15.0-rc2-next-20210924-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:khugepaged      state:D stack:23952 pid:   33 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4955 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6236
 schedule+0xd3/0x270 kernel/sched/core.c:6315
 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x176/0x280 kernel/sched/completion.c:138
 __flush_work+0x56e/0xb10 kernel/workqueue.c:3083
 __lru_add_drain_all+0x3fd/0x760 mm/swap.c:839
 khugepaged_do_scan mm/khugepaged.c:2214 [inline]
 khugepaged+0x112/0x53a0 mm/khugepaged.c:2275
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>