check for errors on bitrotWriter Close() (#20982)

cmd/erasure-healing.go

@@ -608,7 +608,7 @@ func (er *erasureObjects) healObject(ctx context.Context, bucket string, object
 			// later to the final location.
 			err = erasure.Heal(ctx, writers, readers, partSize, prefer)
 			closeBitrotReaders(readers)
-			closeBitrotWriters(writers)
+			closeErrs := closeBitrotWriters(writers)
 			if err != nil {
 				return result, err
 			}
@@ -628,6 +628,13 @@ func (er *erasureObjects) healObject(ctx context.Context, bucket string, object
 					continue
 				}
 
+				// A non-nil stale disk which got error on Close()
+				if closeErrs[i] != nil {
+					outDatedDisks[i] = nil
+					disksToHealCount--
+					continue
+				}
+
 				partsMetadata[i].DataDir = dstDataDir
 				partsMetadata[i].AddObjectPart(partNumber, "", partSize, partActualSize, partModTime, partIdx, partChecksums)
 				if len(inlineBuffers) > 0 && inlineBuffers[i] != nil {