From 1135fc397801c04ab68822978d88ee66de48d52c Mon Sep 17 00:00:00 2001
From: Dmitriy Vyukov <dvyukov@google.com>
Date: Sun, 16 Oct 2011 10:49:24 +0300
Subject: [PATCH] runtime: fix crash if user sets MemProfileRate=0

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5284044
---
 src/pkg/runtime/malloc.goc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/pkg/runtime/malloc.goc b/src/pkg/runtime/malloc.goc
index b7991d03a5..2f6f809127 100644
--- a/src/pkg/runtime/malloc.goc
+++ b/src/pkg/runtime/malloc.goc
@@ -220,7 +220,8 @@ runtime·allocmcache(void)
 	rate = runtime·MemProfileRate;
 	if(rate > 0x3fffffff)	// make 2*rate not overflow
 		rate = 0x3fffffff;
-	c->next_sample = runtime·fastrand1() % (2*rate);
+	if(rate != 0)
+		c->next_sample = runtime·fastrand1() % (2*rate);
 
 	return c;
 }