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BUG: KCSAN: data-race in __filemap_remove_folio / nr_blockdev_pages

read-write to 0xffff8881004c1e70 of 8 bytes by task 7593 on cpu 1:
 page_cache_delete mm/filemap.c:154 [inline]
 __filemap_remove_folio+0x1c5/0x2c0 mm/filemap.c:232
 __remove_mapping+0x33f/0x470 mm/vmscan.c:782
 remove_mapping+0x22/0x90 mm/vmscan.c:815
 mapping_evict_folio mm/truncate.c:277 [inline]
 mapping_try_invalidate+0x266/0x3f0 mm/truncate.c:496
 invalidate_mapping_pages+0x27/0x40 mm/truncate.c:538
 invalidate_bdev+0x58/0x70 block/bdev.c:101
 loop_set_status+0x114/0x550 drivers/block/loop.c:1264
 lo_ioctl+0x7fd/0x11d0
 blkdev_ioctl+0x35f/0x450 block/ioctl.c:676
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x1688/0x2e00 arch/x86/include/generated/asm/syscalls_64.h:17
 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 0xffff8881004c1e70 of 8 bytes by task 3164 on cpu 0:
 nr_blockdev_pages+0x7c/0xd0 block/bdev.c:475
 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:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x526/0x700 kernel/workqueue.c:3390
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000000009 -> 0x0000000000000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3164 Comm: kworker/0:4 Not tainted 6.10.0-syzkaller-11840-g933069701c1b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: events_long defense_work_handler
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SELinux: failure in sel_netif_sid_slow(), invalid network interface (16)