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BUG: KCSAN: data-race in lruvec_lru_size / mem_cgroup_update_lru_size

write to 0xffff88812bcffa10 of 8 bytes by task 16586 on cpu 1:
 mem_cgroup_update_lru_size+0x73/0x110 mm/memcontrol.c:1293
 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+0x2b4/0x8c0 mm/swap.c:977
 pagevec_lru_move_fn+0xf5/0x170 mm/swap.c:211
 __pagevec_lru_add mm/swap.c:987 [inline]
 __lru_cache_add+0x119/0x1c0 mm/swap.c:411
 lru_cache_add+0x1b/0x30 mm/swap.c:447
 add_to_page_cache_lru+0x16b/0x260 mm/filemap.c:937
 mpage_readpages+0x23c/0x370 fs/mpage.c:399
 blkdev_readpages+0x32/0x50 fs/block_dev.c:621
 read_pages+0xa2/0x2d0 mm/readahead.c:126
 __do_page_cache_readahead+0x358/0x380 mm/readahead.c:212
 ra_submit mm/internal.h:62 [inline]
 do_sync_mmap_readahead mm/filemap.c:2407 [inline]
 filemap_fault+0xf7b/0x11d0 mm/filemap.c:2493
 __do_fault+0xa8/0x1e0 mm/memory.c:3450
 do_shared_fault mm/memory.c:3901 [inline]
 do_fault mm/memory.c:3979 [inline]
 handle_pte_fault mm/memory.c:4215 [inline]
 __handle_mm_fault+0x24d9/0x2ec0 mm/memory.c:4345
 handle_mm_fault+0x21c/0x540 mm/memory.c:4382
 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline]
 do_page_fault+0x48a/0xa96 arch/x86/mm/fault.c:1535
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

read to 0xffff88812bcffa10 of 8 bytes by task 1786 on cpu 0:
 mem_cgroup_get_zone_lru_size include/linux/memcontrol.h:536 [inline]
 lruvec_lru_size+0xe6/0x1a0 mm/vmscan.c:326
 get_scan_count mm/vmscan.c:2348 [inline]
 shrink_lruvec+0x170/0xd80 mm/vmscan.c:2452
 shrink_node_memcgs mm/vmscan.c:2671 [inline]
 shrink_node+0x30d/0x1000 mm/vmscan.c:2777
 kswapd_shrink_node mm/vmscan.c:3523 [inline]
 balance_pgdat+0x64c/0xd10 mm/vmscan.c:3681
 kswapd+0x3f3/0x8c0 mm/vmscan.c:3935
 kthread+0x203/0x230 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1786 Comm: kswapd0 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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