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@@ -133,7 +133,9 @@ func (tr *authTransport) RoundTrip(orig *http.Request) (*http.Response, error) {
+                     	}
                      	resp, err := tr.RoundTripper.RoundTrip(req)
                      	if err != nil {
                     +		tr.mu.Lock()
                      		delete(tr.modReq, orig)
                     +		tr.mu.Unlock()
                      		return nil, err
+                     	}
                      	if len(resp.Header["X-Docker-Token"]) > 0 {

registry: add a critical section to protect authTransport.modReq