==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / file_write_and_wait_range

read-write to 0xffff8881444e13e0 of 8 bytes by task 16578 on cpu 0:
 __filemap_add_folio+0x38c/0x720 mm/filemap.c:900
 filemap_add_folio+0x6f/0x150 mm/filemap.c:935
 page_cache_ra_unbounded+0x15e/0x2e0 mm/readahead.c:251
 do_page_cache_ra mm/readahead.c:300 [inline]
 page_cache_ra_order mm/readahead.c:560 [inline]
 ondemand_readahead+0x550/0x6c0 mm/readahead.c:682
 page_cache_async_ra+0x9d/0xb0 mm/readahead.c:731
 filemap_readahead mm/filemap.c:2576 [inline]
 filemap_get_pages mm/filemap.c:2616 [inline]
 filemap_read+0x548/0x1530 mm/filemap.c:2694
 generic_file_read_iter+0x76/0x320 mm/filemap.c:2840
 ext4_file_read_iter+0x1cc/0x290
 call_read_iter include/linux/fs.h:2183 [inline]
 generic_file_splice_read+0xe3/0x290 fs/splice.c:309
 do_splice_to fs/splice.c:793 [inline]
 splice_direct_to_actor+0x25a/0x5f0 fs/splice.c:865
 do_splice_direct+0x104/0x180 fs/splice.c:974
 do_sendfile+0x3b8/0x950 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881444e13e0 of 8 bytes by task 16577 on cpu 1:
 mapping_needs_writeback mm/filemap.c:624 [inline]
 file_write_and_wait_range+0x6a/0x190 mm/filemap.c:776
 ext4_sync_file+0x10d/0x720 fs/ext4/fsync.c:151
 vfs_fsync_range+0x10b/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2885 [inline]
 ext4_buffered_write_iter+0x397/0x3e0 fs/ext4/file.c:292
 ext4_file_write_iter+0x2d2/0x1270
 do_iter_write+0x418/0x700 fs/read_write.c:861
 vfs_iter_write+0x50/0x70 fs/read_write.c:902
 iter_file_splice_write+0x42b/0x7b0 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:931
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:886
 do_splice_direct+0x104/0x180 fs/splice.c:974
 do_sendfile+0x3b8/0x950 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000eb9 -> 0x0000000000000ebe

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16577 Comm: syz-executor.0 Tainted: G        W          6.2.0-rc7-syzkaller-00135-g38c1e0c65865-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
==================================================================