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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881004c3130 of 8 bytes by task 10916 on cpu 1:
 __filemap_add_folio+0x430/0x6f0 mm/filemap.c:929
 filemap_add_folio+0x9c/0x1b0 mm/filemap.c:981
 __filemap_get_folio+0x32f/0x630 mm/filemap.c:1980
 grow_dev_folio fs/buffer.c:1039 [inline]
 grow_buffers fs/buffer.c:1105 [inline]
 __getblk_slow fs/buffer.c:1131 [inline]
 bdev_getblk+0x173/0x3b0 fs/buffer.c:1431
 sb_getblk_gfp include/linux/buffer_head.h:392 [inline]
 __ext4_sb_bread_gfp+0x46/0x180 fs/ext4/super.c:237
 ext4_sb_bread+0x5a/0x70 fs/ext4/super.c:257
 ext4_xattr_delete_inode+0x1fc/0x790 fs/ext4/xattr.c:2966
 ext4_evict_inode+0xa82/0xdd0 fs/ext4/inode.c:273
 evict+0x2f0/0x570 fs/inode.c:796
 iput_final fs/inode.c:1946 [inline]
 iput+0x42a/0x5b0 fs/inode.c:1972
 do_unlinkat+0x283/0x4d0 fs/namei.c:4596
 __do_sys_unlink fs/namei.c:4637 [inline]
 __se_sys_unlink fs/namei.c:4635 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4635
 x64_sys_call+0x2329/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881004c3130 of 8 bytes by task 2962 on cpu 0:
 nr_blockdev_pages+0x7c/0xd0 block/bdev.c:481
 si_meminfo+0x87/0xd0 mm/show_mem.c:80
 update_defense_level+0x49/0x5b0 net/netfilter/ipvs/ip_vs_ctl.c:102
 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3319
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000000005 -> 0x0000000000000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2962 Comm: kworker/0:2 Tainted: G        W          6.14.0-rc4-syzkaller-00242-g7a5668899f54 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_long defense_work_handler
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