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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881023e5708 of 8 bytes by task 16385 on cpu 1:
 __filemap_add_folio+0x38c/0x720 mm/filemap.c:904
 filemap_add_folio+0x6f/0x150 mm/filemap.c:939
 __filemap_get_folio+0x554/0x750 mm/filemap.c:1981
 pagecache_get_page+0x2a/0xd0 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:632 [inline]
 grow_dev_page fs/buffer.c:989 [inline]
 grow_buffers fs/buffer.c:1054 [inline]
 __getblk_slow fs/buffer.c:1081 [inline]
 __getblk_gfp+0x182/0x7e0 fs/buffer.c:1376
 sb_getblk include/linux/buffer_head.h:359 [inline]
 ext4_getblk+0x191/0x4e0 fs/ext4/inode.c:873
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:919
 ext4_append+0x164/0x2a0 fs/ext4/namei.c:83
 ext4_init_new_dir+0x17b/0x510 fs/ext4/namei.c:2956
 ext4_mkdir+0x312/0x740 fs/ext4/namei.c:3002
 vfs_mkdir+0x1ac/0x2b0 fs/namei.c:4038
 do_mkdirat+0xf9/0x260 fs/namei.c:4061
 __do_sys_mkdirat fs/namei.c:4076 [inline]
 __se_sys_mkdirat fs/namei.c:4074 [inline]
 __x64_sys_mkdirat+0x50/0x60 fs/namei.c:4074
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881023e5708 of 8 bytes by task 3113 on cpu 0:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:445
 si_meminfo+0x3e/0x60 mm/page_alloc.c:6020
 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:2390
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2537
 kthread+0x1ac/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x0000000000001347 -> 0x0000000000001348

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3113 Comm: kworker/0:2 Not tainted 6.2.0-syzkaller-12913-gae3419fbac84-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Workqueue: events_long defense_work_handler
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