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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881024a3de0 of 8 bytes by task 2728 on cpu 0:
 __filemap_add_folio+0x385/0x730 mm/filemap.c:907
 filemap_add_folio+0x6f/0x150 mm/filemap.c:942
 __filemap_get_folio+0x313/0x500 mm/filemap.c:1944
 grow_dev_page fs/buffer.c:1063 [inline]
 grow_buffers fs/buffer.c:1123 [inline]
 __getblk_slow fs/buffer.c:1150 [inline]
 __getblk_gfp+0x19b/0x710 fs/buffer.c:1445
 __getblk include/linux/buffer_head.h:424 [inline]
 jbd2_journal_get_descriptor_buffer+0xa1/0x1e0 fs/jbd2/journal.c:1021
 journal_submit_commit_record+0x86/0x4d0 fs/jbd2/commit.c:129
 jbd2_journal_commit_transaction+0x20ab/0x3430 fs/jbd2/commit.c:884
 kjournald2+0x242/0x420 fs/jbd2/journal.c:209
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296

read to 0xffff8881024a3de0 of 8 bytes by task 32678 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:458
 si_meminfo+0x87/0xd0 mm/show_mem.c:83
 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+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296

value changed: 0x00000000000007f5 -> 0x00000000000007f6

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32678 Comm: kworker/1:18 Tainted: G        W          6.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Workqueue: events_long defense_work_handler
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