1 files changed, 8 insertions, 1 deletions

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 3246815c24d6..37e603bf1591 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -736,7 +736,13 @@ xfs_reflink_end_cow(
         /* If there is a hole at end_fsb - 1 go to the previous extent */
         if (!xfs_iext_lookup_extent(ip, ifp, end_fsb - 1, &idx, &got) ||
             got.br_startoff > end_fsb) {
-                ASSERT(idx > 0);
+                /*
+                 * In case of racing, overlapping AIO writes no COW extents
+                 * might be left by the time I/O completes for the loser of
+                 * the race.  In that case we are done.
+                 */
+                if (idx <= 0)
+                        goto out_cancel;
                 xfs_iext_get_extent(ifp, --idx, &got);
         }
 
@@ -809,6 +815,7 @@ next_extent:
 
 out_defer:
         xfs_defer_cancel(&dfops);
+out_cancel:
         xfs_trans_cancel(tp);
         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 out: