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BUG: KCSAN: data-race in __filemap_remove_folio / nr_blockdev_pages

read-write to 0xffff8881004c1830 of 8 bytes by task 700 on cpu 0:
 page_cache_delete mm/filemap.c:146 [inline]
 __filemap_remove_folio+0x1c5/0x2c0 mm/filemap.c:224
 __remove_mapping+0x33f/0x470 mm/vmscan.c:798
 remove_mapping+0x22/0x90 mm/vmscan.c:831
 mapping_evict_folio mm/truncate.c:261 [inline]
 mapping_try_invalidate+0x265/0x3f0 mm/truncate.c:482
 invalidate_mapping_pages+0x27/0x40 mm/truncate.c:524
 invalidate_bdev+0x58/0x70 block/bdev.c:102
 reconfigure_super+0x439/0x5b0 fs/super.c:1106
 do_remount fs/namespace.c:3100 [inline]
 path_mount+0x967/0xb30 fs/namespace.c:3879
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:4088
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4088
 x64_sys_call+0x2c84/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:166
 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 0xffff8881004c1830 of 8 bytes by task 18861 on cpu 1:
 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: 0x000000000000000b -> 0x0000000000000007

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 18861 Comm: kworker/1:3 Not tainted 6.14.0-rc6-syzkaller-00016-g0fed89a961ea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_long defense_work_handler
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