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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff88810279c708 of 8 bytes by task 1409 on cpu 0:
 __filemap_add_folio+0x2d9/0x7f0 mm/filemap.c:904
 filemap_add_folio+0x6b/0x150 mm/filemap.c:959
 __filemap_get_folio+0x4bd/0x680 mm/filemap.c:2003
 pagecache_get_page+0x26/0x190 mm/folio-compat.c:126
 find_or_create_page include/linux/pagemap.h:615 [inline]
 grow_dev_page+0x7a/0x600 fs/buffer.c:946
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 __getblk_gfp+0x112/0x1c0 fs/buffer.c:1333
 __getblk include/linux/buffer_head.h:381 [inline]
 jbd2_journal_get_descriptor_buffer+0xa6/0x1d0 fs/jbd2/journal.c:1016
 journal_submit_commit_record+0x80/0x4b0 fs/jbd2/commit.c:133
 jbd2_journal_commit_transaction+0x1f38/0x3180 fs/jbd2/commit.c:916
 kjournald2+0x253/0x460 fs/jbd2/journal.c:213
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff88810279c708 of 8 bytes by task 3763 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:524
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5835
 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+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x00000000000009bd -> 0x00000000000009be

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3763 Comm: kworker/1:14 Not tainted 5.19.0-rc2-syzkaller-00258-g354c6e071be9-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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