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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff88810248c6f8 of 8 bytes by task 2708 on cpu 1:
 __filemap_add_folio+0x385/0x730 mm/filemap.c:904
 filemap_add_folio+0x6f/0x150 mm/filemap.c:939
 __filemap_get_folio+0x313/0x500 mm/filemap.c:1976
 pagecache_get_page+0x2a/0xb0 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:635 [inline]
 grow_dev_page fs/buffer.c:995 [inline]
 grow_buffers fs/buffer.c:1060 [inline]
 __getblk_slow fs/buffer.c:1087 [inline]
 __getblk_gfp+0x17c/0x8d0 fs/buffer.c:1382
 __getblk include/linux/buffer_head.h:420 [inline]
 jbd2_journal_get_descriptor_buffer+0xa1/0x1e0 fs/jbd2/journal.c:1021
 journal_submit_commit_record+0x80/0x4c0 fs/jbd2/commit.c:129
 jbd2_journal_commit_transaction+0x20a5/0x3410 fs/jbd2/commit.c:884
 kjournald2+0x242/0x420 fs/jbd2/journal.c:209
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88810248c6f8 of 8 bytes by task 6 on cpu 0:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:457
 si_meminfo+0x3e/0x60 mm/page_alloc.c:5197
 update_defense_level+0x43/0x580 net/netfilter/ipvs/ip_vs_ctl.c:101
 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552
 kthread+0x1d7/0x210 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x0000000000000cdb -> 0x0000000000000cdc

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6 Comm: kworker/0:0 Tainted: G        W          6.4.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events_long defense_work_handler
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