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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

write to 0xffff88815447fe78 of 8 bytes by task 23408 on cpu 0:
 __filemap_add_folio+0x256/0x4d0 mm/filemap.c:946
 filemap_add_folio+0x6b/0x150 mm/filemap.c:999
 __filemap_get_folio+0x4c4/0x690 mm/filemap.c:1962
 pagecache_get_page+0x26/0xe0 mm/folio-compat.c:125
 find_or_create_page include/linux/pagemap.h:489 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x189/0x530 fs/buffer.c:1334
 sb_getblk include/linux/buffer_head.h:327 [inline]
 __ext4_get_inode_loc+0x158/0x830 fs/ext4/inode.c:4416
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4529 [inline]
 __ext4_iget+0x1ca/0x1c30 fs/ext4/inode.c:4722
 ext4_fill_super+0x3cbc/0x5870 fs/ext4/super.c:4822
 mount_bdev+0x1e8/0x290 fs/super.c:1370
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1500
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x11cf/0x1c40 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88815447fe78 of 8 bytes by task 25248 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:522
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5778
 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+0x3fc/0x980 kernel/workqueue.c:2298
 worker_thread+0x616/0xa70 kernel/workqueue.c:2445
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000001 -> 0x0000000000000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25248 Comm: kworker/1:11 Not tainted 5.16.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_long defense_work_handler
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