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BUG: KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages

write to 0xffff88812a39c6f0 of 8 bytes by task 20365 on cpu 1:
 page_cache_delete_batch mm/filemap.c:339 [inline]
 delete_from_page_cache_batch+0x5d1/0x830 mm/filemap.c:357
 truncate_inode_pages_range+0x492/0xf10 mm/truncate.c:366
 truncate_inode_pages+0x20/0x30 mm/truncate.c:476
 kill_bdev fs/block_dev.c:86 [inline]
 __blkdev_put+0x205/0x4a0 fs/block_dev.c:1895
 blkdev_put+0x1e6/0x210 fs/block_dev.c:1963
 blkdev_close+0x47/0x50 fs/block_dev.c:1970
 __fput+0x1df/0x460 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:135
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:239 [inline]
 __prepare_exit_to_usermode+0x1c6/0x230 arch/x86/entry/common.c:269
 __syscall_return_slowpath+0x47/0x60 arch/x86/entry/common.c:352
 do_syscall_64+0x5d/0xb0 arch/x86/entry/common.c:393
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812a39c6f0 of 8 bytes by task 9128 on cpu 0:
 nr_blockdev_pages+0x6c/0xb0 fs/block_dev.c:933
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5238
 update_defense_level+0x34/0x550 net/netfilter/ipvs/ip_vs_ctl.c:101
 defense_work_handler+0x1a/0x80 net/netfilter/ipvs/ip_vs_ctl.c:224
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9128 Comm: kworker/0:4 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events defense_work_handler
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