diff --git a/src/runtime/crash_test.go b/src/runtime/crash_test.go
index 8a48c351f6..fae2981610 100644
--- a/src/runtime/crash_test.go
+++ b/src/runtime/crash_test.go
@@ -170,6 +170,9 @@ func checkStaleRuntime(t *testing.T) {
 				t.Logf("go list -f {{.StaleReason}} failed: %v", err)
 			}
 			t.Logf("go list -f {{.StaleReason}} runtime:\n%s", out)
+			out, err = testEnv(exec.Command("ls", "-lR", "--full-time", runtime.GOROOT())).CombinedOutput()
+			t.Logf("%s", out)
+
 			staleRuntimeErr = fmt.Errorf("Stale runtime.a. Run 'go install runtime'.")
 		}
 	})