INFO: task kcompactd0:1645 blocked for more than 143 seconds.
      Not tainted 5.13.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kcompactd0      state:D stack:28408 pid: 1645 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 io_schedule+0xba/0x130 kernel/sched/core.c:7215
 wait_on_page_bit_common+0x571/0xe90 mm/filemap.c:1301
 lock_page include/linux/pagemap.h:625 [inline]
 __unmap_and_move mm/migrate.c:1023 [inline]
 unmap_and_move mm/migrate.c:1173 [inline]
 migrate_pages+0xa49/0x37d0 mm/migrate.c:1447
 compact_zone+0x1ab6/0x3810 mm/compaction.c:2401
 kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2816
 kcompactd+0x262/0xd10 mm/compaction.c:2911
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Showing all locks held in the system:
2 locks held by systemd/1:
1 lock held by khungtaskd/1632:
 #0: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333
1 lock held by kswapd0/2140:
1 lock held by kswapd1/2141:
2 locks held by systemd-journal/4850:
1 lock held by cron/8130:
2 locks held by in:imklog/8135:
3 locks held by rs:main Q:Reg/8136:
2 locks held by syz-fuzzer/8407:
2 locks held by syz-fuzzer/8408:

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1632 Comm: khungtaskd Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd48/0xfb0 kernel/hung_task.c:294
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2140 Comm: kswapd0 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197
Code: ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 65 8b 05 39 13 8d 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9
RSP: 0018:ffffc90008367658 EFLAGS: 00000093
RAX: 0000000080000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801ba19c40 RSI: ffffffff817aec81 RDI: 0000000000000003
RBP: ffffffff81b078a5 R08: 0000000000000000 R09: ffffc90008367638
R10: ffffffff817aec78 R11: 0000000000000000 R12: ffffc90008367768
R13: ffffc90008367770 R14: 0000000000000021 R15: ffffc90008367770
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f395adb9c58 CR3: 00000000163e9000 CR4: 0000000000350ef0
Call Trace:
 trace_hardirqs_on+0x51/0x1c0 kernel/trace/trace_preemptirq.c:49
 free_unref_page_list+0x575/0x7c0 mm/page_alloc.c:3341
 shrink_inactive_list+0x4a5/0xca0 mm/vmscan.c:2160
 shrink_list mm/vmscan.c:2367 [inline]
 shrink_lruvec+0x7f9/0x14f0 mm/vmscan.c:2662
 shrink_node_memcgs mm/vmscan.c:2850 [inline]
 shrink_node+0x868/0x1de0 mm/vmscan.c:2967
 kswapd_shrink_node mm/vmscan.c:3710 [inline]
 balance_pgdat+0x745/0x1270 mm/vmscan.c:3868
 kswapd+0x5b6/0xdb0 mm/vmscan.c:4125
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294