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BUG: KCSAN: data-race in __filemap_add_folio / invalidate_bdev

read-write to 0xffff888101ba7600 of 8 bytes by task 2479 on cpu 1:
 __filemap_add_folio+0x2d9/0x7f0 mm/filemap.c:904
 filemap_add_folio+0x6b/0x150 mm/filemap.c:959
 page_cache_ra_unbounded+0x19e/0x2e0 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+0x190/0x1b0 mm/readahead.c:691
 page_cache_sync_readahead include/linux/pagemap.h:1185 [inline]
 filemap_get_pages mm/filemap.c:2592 [inline]
 filemap_read+0x3e5/0x1400 mm/filemap.c:2679
 blkdev_read_iter+0x2c6/0x370 block/fops.c:611
 call_read_iter include/linux/fs.h:2044 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0x5a5/0x6a0 fs/read_write.c:482
 ksys_read+0xe8/0x1a0 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/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888101ba7600 of 8 bytes by task 3425 on cpu 0:
 invalidate_bdev+0x31/0x80 block/bdev.c:85
 bdev_disk_changed+0xed/0xc30 block/partitions/core.c:674
 loop_reread_partitions drivers/block/loop.c:517 [inline]
 loop_set_status+0x4ee/0x590 drivers/block/loop.c:1304
 lo_ioctl+0x810/0x11b0
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:588
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000005 -> 0x0000000000000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3425 Comm: syz-executor.2 Not tainted 5.18.0-rc7-syzkaller-00015-gef1302160bfb-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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 loop2: p4