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BUG: KCSAN: data-race in __filemap_add_folio / iomap_dio_complete

read-write to 0xffff8881368f1c80 of 8 bytes by task 16161 on cpu 1:
 __filemap_add_folio+0x4e9/0x990 mm/filemap.c:898
 filemap_add_folio+0x6b/0x150 mm/filemap.c:933
 page_cache_ra_unbounded+0x19e/0x2e0 mm/readahead.c:245
 do_page_cache_ra mm/readahead.c:293 [inline]
 page_cache_ra_order mm/readahead.c:550 [inline]
 ondemand_readahead+0x5df/0x780 mm/readahead.c:672
 page_cache_sync_ra+0xdc/0xf0 mm/readahead.c:699
 page_cache_sync_readahead include/linux/pagemap.h:1215 [inline]
 filemap_get_pages mm/filemap.c:2566 [inline]
 filemap_read+0x3ef/0x1430 mm/filemap.c:2660
 generic_file_read_iter+0x72/0x320 mm/filemap.c:2806
 ext4_file_read_iter+0x1e9/0x2a0
 call_read_iter include/linux/fs.h:2183 [inline]
 generic_file_splice_read+0xe0/0x1c0 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x26c/0x620 fs/splice.c:868
 do_splice_direct+0xfb/0x180 fs/splice.c:977
 do_sendfile+0x3bf/0x910 fs/read_write.c:1251
 __do_sys_sendfile64 fs/read_write.c:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1305 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1305
 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+0x63/0xcd

read to 0xffff8881368f1c80 of 8 bytes by task 16169 on cpu 0:
 iomap_dio_complete+0x34a/0x460 fs/iomap/direct-io.c:113
 iomap_dio_rw+0x5e/0x80 fs/iomap/direct-io.c:694
 ext4_dio_write_iter fs/ext4/file.c:566 [inline]
 ext4_file_write_iter+0xaa9/0x1210 fs/ext4/file.c:677
 do_iter_write+0x494/0x750 fs/read_write.c:857
 vfs_iter_write+0x4c/0x70 fs/read_write.c:898
 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:934
 splice_direct_to_actor+0x305/0x620 fs/splice.c:889
 do_splice_direct+0xfb/0x180 fs/splice.c:977
 do_sendfile+0x3bf/0x910 fs/read_write.c:1251
 __do_sys_sendfile64 fs/read_write.c:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1305 [inline]
 __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1305
 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+0x63/0xcd

value changed: 0x0000000000000461 -> 0x0000000000000466

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16169 Comm: syz-executor.0 Not tainted 5.19.0-syzkaller-12689-g3bc1bc0b59d0-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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