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BUG: KCSAN: data-race in get_scan_count / mem_cgroup_update_lru_size

write to 0xffff88812bd0f9f0 of 8 bytes by task 1933 on cpu 0:
 mem_cgroup_update_lru_size+0x53/0xf0 mm/memcontrol.c:1275
 update_lru_size include/linux/mm_inline.h:44 [inline]
 add_page_to_lru_list include/linux/mm_inline.h:51 [inline]
 __pagevec_lru_add_fn+0x39e/0x570 mm/swap.c:1019
 pagevec_lru_move_fn+0xff/0x190 mm/swap.c:227
 __pagevec_lru_add mm/swap.c:1029 [inline]
 lru_cache_add+0x132/0x180 mm/swap.c:473
 putback_lru_page+0x15/0x110 mm/vmscan.c:977
 __unmap_and_move+0x516/0x670 mm/migrate.c:1157
 unmap_and_move+0x133/0x800 mm/migrate.c:1196
 migrate_pages+0x1ad/0xa30 mm/migrate.c:1444
 compact_zone+0x1576/0x1de0 mm/compaction.c:2207
 kcompactd_do_work+0x171/0x3b0 mm/compaction.c:2575
 kcompactd+0x1d0/0x3f0 mm/compaction.c:2668
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

read to 0xffff88812bd0f9f0 of 8 bytes by task 2462 on cpu 1:
 mem_cgroup_get_zone_lru_size include/linux/memcontrol.h:523 [inline]
 lruvec_lru_size mm/vmscan.c:332 [inline]
 get_scan_count+0x2b3/0x770 mm/vmscan.c:2333
 shrink_lruvec+0x5a/0x620 mm/vmscan.c:2437
 shrink_node_memcgs+0x1be/0x360 mm/vmscan.c:2656
 shrink_node+0x94e/0x1170 mm/vmscan.c:2770
 kswapd_shrink_node mm/vmscan.c:3517 [inline]
 balance_pgdat+0x675/0xbb0 mm/vmscan.c:3675
 kswapd+0x1ef/0x370 mm/vmscan.c:3932
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2462 Comm: kswapd0 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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