From 9f04a62a39133439e20ea32a658cc35c21d33729 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Wed, 3 Dec 2014 14:14:00 -0500
Subject: [PATCH] cmd/pprof: fix symbol resolution for remote profiles

Fixes #9199.

LGTM=iant
R=golang-codereviews, iant
CC=austin, golang-codereviews, minux
https://golang.org/cl/183080043
---
 src/cmd/pprof/internal/symbolizer/symbolizer.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/cmd/pprof/internal/symbolizer/symbolizer.go b/src/cmd/pprof/internal/symbolizer/symbolizer.go
index cabddaa76e5..86de5640d29 100644
--- a/src/cmd/pprof/internal/symbolizer/symbolizer.go
+++ b/src/cmd/pprof/internal/symbolizer/symbolizer.go
@@ -32,6 +32,10 @@ func Symbolize(mode string, prof *profile.Profile, obj plugin.ObjTool, ui plugin
 		}
 	}
 
+	if len(prof.Mapping) == 0 {
+		return fmt.Errorf("no known mappings")
+	}
+
 	mt, err := newMapping(prof, obj, ui, force)
 	if err != nil {
 		return err