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BUG: KCSAN: data-race in __delete_from_page_cache / nr_blockdev_pages

write to 0xffff88810042cc38 of 8 bytes by task 1438 on cpu 1:
 page_cache_delete mm/filemap.c:146 [inline]
 __delete_from_page_cache+0x1e1/0x2c0 mm/filemap.c:231
 __remove_mapping+0x494/0x5f0 mm/vmscan.c:1276
 remove_mapping+0x22/0x60 mm/vmscan.c:1303
 invalidate_complete_page mm/truncate.c:216 [inline]
 invalidate_inode_page+0x15d/0x190 mm/truncate.c:265
 __invalidate_mapping_pages+0x111/0x2b0 mm/truncate.c:504
 invalidate_mapping_pages+0x23/0x30 mm/truncate.c:543
 invalidate_bdev+0x67/0x80 block/bdev.c:89
 bdev_disk_changed+0xf7/0xe50 block/partitions/core.c:679
 blkdev_get_whole block/bdev.c:684 [inline]
 blkdev_get_by_dev+0x6ba/0xc60 block/bdev.c:826
 blkdev_reread_part block/ioctl.c:103 [inline]
 blkdev_common_ioctl+0x10ed/0x1180 block/ioctl.c:525
 blkdev_ioctl+0x1a7/0x440 block/ioctl.c:603
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860
 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 0xffff88810042cc38 of 8 bytes by task 7922 on cpu 0:
 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: 0x000000000000010c -> 0x00000000000000fd

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7922 Comm: kworker/0:0 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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GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog