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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881023fcd08 of 8 bytes by task 2700 on cpu 0:
 __filemap_add_folio+0x38c/0x720
 filemap_add_folio+0x6f/0x150
 __filemap_get_folio+0x554/0x750
 pagecache_get_page+0x2a/0xd0
 __getblk_gfp+0x182/0x7e0
 jbd2_journal_get_descriptor_buffer+0xa1/0x1e0
 jbd2_journal_write_revoke_records+0x365/0x730
 jbd2_journal_commit_transaction+0x9a8/0x34e0
 kjournald2+0x242/0x420
 kthread+0x1ac/0x1e0
 ret_from_fork+0x1f/0x30

read to 0xffff8881023fcd08 of 8 bytes by task 3244 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: 0x000000000000064d -> 0x000000000000064e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3244 Comm: kworker/1:5 Tainted: G        W          6.2.0-rc6-syzkaller-00239-g0136d86b7852-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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