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BUG: KCSAN: data-race in nr_blockdev_pages / page_cache_delete_batch

read-write to 0xffff8881027a4608 of 8 bytes by task 2267 on cpu 0:
 page_cache_delete_batch+0x445/0x470 mm/filemap.c:315
 delete_from_page_cache_batch+0x18f/0x2a0 mm/filemap.c:334
 truncate_inode_pages_range+0x3ca/0xae0 mm/truncate.c:370
 truncate_inode_pages+0x20/0x30 mm/truncate.c:452
 kill_bdev block/bdev.c:77 [inline]
 blkdev_flush_mapping+0xde/0x230 block/bdev.c:663
 blkdev_put_whole block/bdev.c:694 [inline]
 blkdev_put+0x32a/0x420 block/bdev.c:954
 blkdev_close+0x32/0x40 block/fops.c:495
 __fput+0x292/0x510 fs/file_table.c:317
 ____fput+0x11/0x20 fs/file_table.c:350
 task_work_run+0x8e/0x110 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:169
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff8881027a4608 of 8 bytes by task 31492 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:524
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5835
 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+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x000000000000008d -> 0x000000000000007e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31492 Comm: kworker/1:11 Not tainted 5.19.0-rc2-syzkaller-00302-g05c6ca8512f2-dirty #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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