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BUG: KCSAN: data-race in find_get_pages_range_tag / xas_clear_mark

write to 0xffff88812042fb30 of 8 bytes by interrupt on cpu 1:
 __test_and_clear_bit include/asm-generic/bitops-instrumented.h:213 [inline]
 node_clear_mark lib/xarray.c:99 [inline]
 xas_clear_mark+0x11a/0x1d0 lib/xarray.c:907
 __xa_clear_mark+0xd3/0x100 lib/xarray.c:1713
 test_clear_page_writeback+0x435/0x780 mm/page-writeback.c:2727
 end_page_writeback+0x9e/0x190 mm/filemap.c:1330
 ext4_finish_bio+0x40d/0x520 fs/ext4/page-io.c:110
 ext4_end_bio+0xd2/0x310 fs/ext4/page-io.c:334
 bio_endio+0x3ab/0x500 block/bio.c:1830
 req_bio_endio block/blk-core.c:239 [inline]
 blk_update_request+0x21d/0x6a0 block/blk-core.c:1424
 scsi_end_request+0x6b/0x3e0 drivers/scsi/scsi_lib.c:579
 scsi_io_completion+0x11d/0xc80 drivers/scsi/scsi_lib.c:963
 scsi_finish_command+0x280/0x380 drivers/scsi/scsi.c:228
 scsi_softirq_done+0x259/0x280 drivers/scsi/scsi_lib.c:1465
 blk_done_softirq+0x1eb/0x250 block/blk-softirq.c:37
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603

read to 0xffff88812042fb30 of 8 bytes by task 7233 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1590 [inline]
 xas_next_marked include/linux/xarray.h:1620 [inline]
 find_get_pages_range_tag+0x3d6/0x6d0 mm/filemap.c:1939
 pagevec_lookup_range_tag+0x45/0x70 mm/swap.c:1014
 __filemap_fdatawait_range+0xdc/0x1d0 mm/filemap.c:512
 filemap_fdatawait_keep_errors+0x2b/0x50 mm/filemap.c:615
 wait_sb_inodes+0x36e/0x3f0 fs/fs-writeback.c:2348
 sync_inodes_sb+0x16e/0x1b0 fs/fs-writeback.c:2470
 __sync_filesystem fs/sync.c:34 [inline]
 sync_filesystem fs/sync.c:67 [inline]
 sync_filesystem+0x138/0x1a0 fs/sync.c:48
 ovl_sync_fs+0x92/0xa0 fs/overlayfs/super.c:275
 __sync_filesystem fs/sync.c:39 [inline]
 sync_filesystem fs/sync.c:67 [inline]
 sync_filesystem+0x168/0x1a0 fs/sync.c:48
 generic_shutdown_super+0x6b/0x260 fs/super.c:444
 kill_anon_super+0x2f/0x50 fs/super.c:1102
 deactivate_locked_super+0x64/0xb0 fs/super.c:331
 deactivate_super fs/super.c:362 [inline]
 deactivate_super+0xca/0xe0 fs/super.c:358

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7233 Comm: syz-executor.0 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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