INFO: task kcompactd0:1183 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc6-next-20200924-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kcompactd0      state:D stack:28392 pid: 1183 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xec5/0x2200 kernel/sched/core.c:4526
 schedule+0xcf/0x270 kernel/sched/core.c:4604
 io_schedule+0xb5/0x120 kernel/sched/core.c:6298
 wait_on_page_bit_common+0x32a/0xe30 mm/filemap.c:1273
 lock_page include/linux/pagemap.h:610 [inline]
 __unmap_and_move mm/migrate.c:1047 [inline]
 unmap_and_move mm/migrate.c:1197 [inline]
 migrate_pages+0x793/0x30a0 mm/migrate.c:1453
 compact_zone+0x1ca0/0x3ba0 mm/compaction.c:2314
 kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2724
 kcompactd+0x25d/0xd00 mm/compaction.c:2819
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
INFO: task syz-executor.5:10578 can't die for more than 144 seconds.
task:syz-executor.5  state:R  running task     stack:22208 pid:10578 ppid:  6893 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xec5/0x2200 kernel/sched/core.c:4526
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4685
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40