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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff888101fed6c8 of 8 bytes by task 1398 on cpu 1:
 __filemap_add_folio+0x379/0x6e0 mm/filemap.c:899
 filemap_add_folio+0x6b/0x150 mm/filemap.c:934
 __filemap_get_folio+0x510/0x6d0 mm/filemap.c:1976
 pagecache_get_page+0x26/0xe0 mm/folio-compat.c:110
 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:411 [inline]
 jbd2_journal_get_descriptor_buffer+0xa6/0x1d0 fs/jbd2/journal.c:1019
 jbd2_journal_commit_transaction+0x9cf/0x30b0 fs/jbd2/commit.c:645
 kjournald2+0x233/0x420 fs/jbd2/journal.c:210
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

read to 0xffff888101fed6c8 of 8 bytes by task 1918 on cpu 0:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:523
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5980
 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 arch/x86/entry/entry_64.S:306

value changed: 0x0000000000000565 -> 0x0000000000000566

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1918 Comm: kworker/0:3 Tainted: G        W          6.1.0-rc2-syzkaller-00338-g576e61cea1e4-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: events_long defense_work_handler
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