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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

write to 0xffff888101ba36b0 of 8 bytes by task 1404 on cpu 1:
 __filemap_add_folio+0x256/0x4d0 mm/filemap.c:897
 filemap_add_folio+0x6b/0x150 mm/filemap.c:950
 __filemap_get_folio+0x4c4/0x690 mm/filemap.c:2001
 pagecache_get_page+0x26/0xe0 mm/folio-compat.c:125
 find_or_create_page include/linux/pagemap.h:488 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x189/0x530 fs/buffer.c:1334
 __getblk include/linux/buffer_head.h:382 [inline]
 jbd2_journal_get_descriptor_buffer+0x71/0x140 fs/jbd2/journal.c:1016
 jbd2_journal_commit_transaction+0x766/0x25f0 fs/jbd2/commit.c:643
 kjournald2+0x1cf/0x390 fs/jbd2/journal.c:213
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

read to 0xffff888101ba36b0 of 8 bytes by task 1911 on cpu 0:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:517
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5798
 update_defense_level+0x46/0x560 net/netfilter/ipvs/ip_vs_ctl.c:102
 defense_work_handler+0x1b/0x80 net/netfilter/ipvs/ip_vs_ctl.c:236
 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
 worker_thread+0x616/0xa70 kernel/workqueue.c:2454
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

value changed: 0x000000000000150b -> 0x000000000000150c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1911 Comm: kworker/0:7 Not tainted 5.17.0-rc5-syzkaller-00021-g23d04328444a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_long defense_work_handler
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