==================================================================
BUG: KCSAN: data-race in nr_blockdev_pages / page_cache_delete

read-write to 0xffff8881004b0c48 of 8 bytes by task 1826 on cpu 0:
 page_cache_delete+0x35d/0x390 mm/filemap.c:145
 __filemap_remove_folio+0x3b/0xf0 mm/filemap.c:223
 __remove_mapping+0x42a/0x530 mm/vmscan.c:1366
 remove_mapping+0x1f/0x140 mm/vmscan.c:1399
 mapping_evict_folio mm/truncate.c:282 [inline]
 invalidate_mapping_pagevec+0x44d/0x5d0 mm/truncate.c:528
 invalidate_mapping_pages+0x23/0x30 mm/truncate.c:567
 invalidate_bdev+0x67/0x80 block/bdev.c:86
 ext4_put_super+0x510/0x810 fs/ext4/super.c:1279
 generic_shutdown_super+0xd5/0x240 fs/super.c:491
 kill_block_super+0x4a/0x90 fs/super.c:1427
 deactivate_locked_super+0x6a/0xb0 fs/super.c:332
 deactivate_super+0x85/0x90 fs/super.c:363
 cleanup_mnt+0x2b6/0x320 fs/namespace.c:1186
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1193
 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+0x63/0xcd

read to 0xffff8881004b0c48 of 8 bytes by task 1920 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:522
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5924
 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: 0x00000000000000c8 -> 0x00000000000000bb

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1920 Comm: kworker/1:6 Not tainted 6.0.0-rc2-syzkaller-00283-g10d4879f9ef0-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: events_long defense_work_handler
==================================================================