diff --git a/internal/crashmonitor/monitor_test.go b/internal/crashmonitor/monitor_test.go
index 0ec3787..e889dcd 100644
--- a/internal/crashmonitor/monitor_test.go
+++ b/internal/crashmonitor/monitor_test.go
@@ -79,7 +79,13 @@ func TestViaStderr(t *testing.T) {
 	want := "crash/crash\n" +
 		"runtime.gopanic:--\n" +
 		"golang.org/x/telemetry/internal/crashmonitor_test.grandchild:=66\n" +
-		"golang.org/x/telemetry/internal/crashmonitor_test.child:+2\n" +
+		// TODO(adonovan): CL 561635 to the Go runtime, which causes
+		// the GOTRACEBACK=system output to be a valid input to CallersFrames,
+		// was reverted (see #65761), hopefully temporarily.
+		// For now the output contains missing frames and sometimes wrong
+		// line numbers.
+		//
+		// "golang.org/x/telemetry/internal/crashmonitor_test.child:+2\n" +
 		"golang.org/x/telemetry/internal/crashmonitor_test.TestMain:+9\n" +
 		"main.main:--\n" +
 		"runtime.main:--\n" +
@@ -147,7 +153,13 @@ func TestStart(t *testing.T) {
 		want := "crash/crash\n" +
 			"runtime.gopanic:--\n" +
 			"golang.org/x/telemetry/internal/crashmonitor_test.grandchild:=66\n" +
-			"golang.org/x/telemetry/internal/crashmonitor_test.child:+2\n" +
+			// TODO(adonovan): CL 561635 to the Go runtime, which causes
+			// the GOTRACEBACK=system output to be a valid input to CallersFrames,
+			// was reverted (see #65761), hopefully temporarily.
+			// For now the output contains missing frames and sometimes wrong
+			// line numbers.
+			//
+			//"golang.org/x/telemetry/internal/crashmonitor_test.child:+2\n" +
 			"golang.org/x/telemetry/internal/crashmonitor_test.TestMain.func3:+1\n" +
 			"runtime.goexit:--"
 		if got != want {