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BUG: KCSAN: data-race in __writeback_single_inode / xas_set_mark

write to 0xffff88810a9658fc of 4 bytes by task 24289 on cpu 1:
 xa_mark_set lib/xarray.c:69 [inline]
 xas_set_mark+0x131/0x140 lib/xarray.c:894
 __folio_start_writeback+0x23f/0x4b0 mm/page-writeback.c:3070
 set_page_writeback+0x46/0xf0 mm/folio-compat.c:51
 ext4_bio_write_page+0x61a/0xcf0 fs/ext4/page-io.c:558
 mpage_submit_page fs/ext4/inode.c:2129 [inline]
 mpage_process_page_bufs+0x440/0x540 fs/ext4/inode.c:2243
 mpage_prepare_extent_to_map+0x5d7/0x910 fs/ext4/inode.c:2696
 ext4_do_writepages+0x6ec/0x2140 fs/ext4/inode.c:2829
 ext4_writepages+0x127/0x250 fs/ext4/inode.c:2964
 do_writepages+0x1c5/0x340 mm/page-writeback.c:2551
 filemap_fdatawrite_wbc+0xdb/0xf0 mm/filemap.c:390
 __filemap_fdatawrite_range mm/filemap.c:423 [inline]
 file_write_and_wait_range+0xfa/0x190 mm/filemap.c:781
 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:2452 [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+0x456/0x7d0 fs/splice.c:778
 do_splice_from fs/splice.c:856 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:1023
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:978
 do_splice_direct+0x104/0x180 fs/splice.c:1066
 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 0xffff88810a9658fc of 4 bytes by task 24306 on cpu 0:
 xa_marked include/linux/xarray.h:420 [inline]
 mapping_tagged include/linux/fs.h:463 [inline]
 __writeback_single_inode+0x21d/0x860 fs/fs-writeback.c:1651
 writeback_single_inode+0x12f/0x4a0 fs/fs-writeback.c:1721
 sync_inode_metadata+0x56/0x80 fs/fs-writeback.c:2777
 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline]
 ext4_sync_file+0x356/0x720 fs/ext4/fsync.c:170
 vfs_fsync_range+0x10b/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2452 [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+0x456/0x7d0 fs/splice.c:778
 do_splice_from fs/splice.c:856 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:1023
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:978
 do_splice_direct+0x104/0x180 fs/splice.c:1066
 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: 0x28000021 -> 0x00000021

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24306 Comm: syz-executor.4 Not tainted 6.2.0-syzkaller-10827-g489fa31ea873-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
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