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BUG: KCSAN: data-race in __filemap_remove_folio / nr_blockdev_pages

read-write to 0xffff8881023f1c48 of 8 bytes by task 3126 on cpu 0:
 __filemap_remove_folio+0x22f/0x330
 __remove_mapping+0x35b/0x480
 remove_mapping+0x23/0xa0
 invalidate_mapping_pagevec+0x2a9/0x3f0
 invalidate_mapping_pages+0x27/0x30
 invalidate_bdev+0x6b/0x80
 ext4_put_super+0x4f8/0x7f0
 generic_shutdown_super+0xd9/0x240
 kill_block_super+0x4e/0xa0
 deactivate_locked_super+0x6b/0xd0
 deactivate_super+0x9b/0xb0
 cleanup_mnt+0x23e/0x2a0
 __cleanup_mnt+0x19/0x20
 task_work_run+0x123/0x160
 exit_to_user_mode_loop+0xcf/0xe0
 exit_to_user_mode_prepare+0x6a/0xa0
 syscall_exit_to_user_mode+0x26/0x140
 do_syscall_64+0x4d/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881023f1c48 of 8 bytes by task 4379 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0
 si_meminfo+0x3e/0x60
 update_defense_level+0x43/0x580
 defense_work_handler+0x1f/0x80
 process_one_work+0x3e6/0x750
 worker_thread+0x5ef/0xa10
 kthread+0x1ac/0x1e0
 ret_from_fork+0x1f/0x30

value changed: 0x000000000000000a -> 0x0000000000000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4379 Comm: kworker/1:9 Not tainted 6.2.0-rc6-syzkaller-00273-g837c07cf68fe-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: events_long defense_work_handler

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