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BUG: KCSAN: data-race in __iomap_dio_rw / xas_set_mark

write to 0xffff88813e4b328c of 4 bytes by task 13416 on cpu 0:
 xa_mark_set lib/xarray.c:69 [inline]
 xas_set_mark+0x11e/0x130 lib/xarray.c:889
 __folio_start_writeback+0x210/0x490 mm/page-writeback.c:2872
 set_page_writeback+0x39/0x50 mm/folio-compat.c:77
 ext4_bio_write_page+0xdd/0x720 fs/ext4/page-io.c:455
 mpage_submit_page fs/ext4/inode.c:2080 [inline]
 mpage_map_and_submit_buffers fs/ext4/inode.c:2326 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2465 [inline]
 ext4_writepages+0xe76/0x1a60 fs/ext4/inode.c:2778
 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc mm/filemap.c:384 [inline]
 __filemap_fdatawrite_range mm/filemap.c:417 [inline]
 file_write_and_wait_range+0x134/0x1d0 mm/filemap.c:775
 ext4_sync_file+0xad/0x570 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2884 [inline]
 ext4_buffered_write_iter+0x243/0x290 fs/ext4/file.c:275
 ext4_file_write_iter+0x227/0xda0
 call_write_iter include/linux/fs.h:2074 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x7f5/0x950 fs/read_write.c:590
 ksys_write+0xd9/0x190 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813e4b328c of 4 bytes by task 13421 on cpu 1:
 xa_marked include/linux/xarray.h:418 [inline]
 mapping_tagged include/linux/fs.h:487 [inline]
 filemap_range_needs_writeback include/linux/pagemap.h:987 [inline]
 __iomap_dio_rw+0x411/0x10a0 fs/iomap/direct-io.c:517
 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:680
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x190/0x1f0 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:2068 [inline]
 aio_read+0x1d8/0x290 fs/aio.c:1565
 io_submit_one+0x88d/0x1410 fs/aio.c:2024
 __do_sys_io_submit fs/aio.c:2083 [inline]
 __se_sys_io_submit+0x105/0x280 fs/aio.c:2053
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:2053
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0a000021 -> 0x04000021

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13421 Comm: syz-executor.5 Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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