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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff888102469c78 of 8 bytes by task 18551 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
 sb_getblk include/linux/buffer_head.h:365 [inline]
 ext4_getblk+0x191/0x4e0 fs/ext4/inode.c:845
 ext4_bread_batch+0x5b/0x350 fs/ext4/inode.c:912
 __ext4_find_entry+0x9cf/0x10a0 fs/ext4/namei.c:1666
 ext4_lookup_entry fs/ext4/namei.c:1767 [inline]
 ext4_lookup+0xc7/0x390 fs/ext4/namei.c:1835
 lookup_open fs/namei.c:3470 [inline]
 open_last_lookups fs/namei.c:3560 [inline]
 path_openat+0xc43/0x1d00 fs/namei.c:3788
 do_filp_open+0xf6/0x200 fs/namei.c:3818
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_creat fs/open.c:1448 [inline]
 __se_sys_creat fs/open.c:1442 [inline]
 __x64_sys_creat+0x66/0x90 fs/open.c:1442
 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 0xffff888102469c78 of 8 bytes by task 17040 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: 0x0000000000000005 -> 0x0000000000000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17040 Comm: kworker/0:2 Not tainted 6.4.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events_long defense_work_handler
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