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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881023e1708 of 8 bytes by task 1400 on cpu 1:
 __filemap_add_folio+0x4e9/0x990 mm/filemap.c:898
 filemap_add_folio+0x6b/0x150 mm/filemap.c:933
 __filemap_get_folio+0x510/0x6d0 mm/filemap.c:1981
 pagecache_get_page+0x26/0x190 mm/folio-compat.c:104
 find_or_create_page include/linux/pagemap.h:613 [inline]
 grow_dev_page+0x7a/0x5f0 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:407 [inline]
 jbd2_journal_get_descriptor_buffer+0x9d/0x1a0 fs/jbd2/journal.c:1013
 jbd2_journal_commit_transaction+0x9cf/0x3090 fs/jbd2/commit.c:647
 kjournald2+0x253/0x460 fs/jbd2/journal.c:210
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff8881023e1708 of 8 bytes by task 6 on cpu 0:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:522
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5924
 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: 0x0000000000000fcb -> 0x0000000000000fcc

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6 Comm: kworker/0:0 Not tainted 6.0.0-rc2-syzkaller-00054-gc40e8341e3b3-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_long defense_work_handler
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