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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

write to 0xffff888101baac70 of 8 bytes by task 2098 on cpu 0:
 __filemap_add_folio+0x2f1/0x810 mm/filemap.c:904
 filemap_add_folio+0x6b/0x150 mm/filemap.c:959
 page_cache_ra_unbounded+0x1b0/0x310 mm/readahead.c:243
 do_page_cache_ra mm/readahead.c:291 [inline]
 force_page_cache_ra+0x1c6/0x200 mm/readahead.c:322
 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:688
 page_cache_sync_readahead include/linux/pagemap.h:1185 [inline]
 filemap_get_pages mm/filemap.c:2598 [inline]
 filemap_read+0x3d5/0xe10 mm/filemap.c:2685
 blkdev_read_iter+0x2cc/0x380 block/fops.c:611
 call_read_iter include/linux/fs.h:2044 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0x5e2/0x6c0 fs/read_write.c:482
 ksys_read+0xd9/0x190 fs/read_write.c:620
 __do_sys_read fs/read_write.c:630 [inline]
 __se_sys_read fs/read_write.c:628 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:628
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888101baac70 of 8 bytes by task 763 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:517
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5817
 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+0x3e3/0x970 kernel/workqueue.c:2289
 worker_thread+0x638/0xaa0 kernel/workqueue.c:2436
 kthread+0x1bf/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000009 -> 0x000000000000000a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 763 Comm: kworker/1:2 Not tainted 5.18.0-rc1-syzkaller-00009-gce4c854ee868-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_long defense_work_handler
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