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BUG: KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages

read-write to 0xffff8881024e0be0 of 8 bytes by task 17520 on cpu 1:
 page_cache_delete_batch mm/filemap.c:320 [inline]
 delete_from_page_cache_batch+0x521/0x750 mm/filemap.c:339
 truncate_inode_pages_range+0x354/0x800 mm/truncate.c:369
 __jbd2_journal_erase fs/jbd2/journal.c:1841 [inline]
 jbd2_journal_flush+0x54c/0x820 fs/jbd2/journal.c:2492
 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1089 [inline]
 __ext4_ioctl fs/ext4/ioctl.c:1597 [inline]
 ext4_ioctl+0x1fe3/0x2e10 fs/ext4/ioctl.c:1617
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881024e0be0 of 8 bytes by task 899 on cpu 0:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:458
 si_meminfo+0x87/0xd0 mm/show_mem.c:83
 update_defense_level+0x43/0x580 net/netfilter/ipvs/ip_vs_ctl.c:101
 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296

value changed: 0x0000000000000a3f -> 0x0000000000000a30

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 899 Comm: kworker/0:2 Not tainted 6.5.0-rc2-syzkaller-00052-gbfa3037d8280 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Workqueue: events_long defense_work_handler
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