diff --git a/br/pkg/storage/gcs_extra.go b/br/pkg/storage/gcs_extra.go
index 15b3ef5715d5a..0a8c5763fff62 100644
--- a/br/pkg/storage/gcs_extra.go
+++ b/br/pkg/storage/gcs_extra.go
@@ -144,7 +144,7 @@ func (w *GCSWriter) readChunk(ch chan chunk) {
 		select {
 		case <-w.ctx.Done():
 			data.cleanup()
-			return
+			w.err.CompareAndSwap(nil, w.ctx.Err())
 		default:
 			part := &xmlMPUPart{
 				uploadBase: w.uploadBase,