From 8e99016c80ee8c113674654123a02f0bd9e32ebb Mon Sep 17 00:00:00 2001
From: Dmitriy Vyukov <dvyukov@google.com>
Date: Tue, 17 Jan 2012 11:48:20 +0400
Subject: [PATCH] old/netchan: fix data race on client hashmap Fixes #2713.

R=golang-dev, r
CC=golang-dev, mpimenov
https://golang.org/cl/5545065
---
 src/pkg/old/netchan/common.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/pkg/old/netchan/common.go b/src/pkg/old/netchan/common.go
index 710b63ac50..d0daf53720 100644
--- a/src/pkg/old/netchan/common.go
+++ b/src/pkg/old/netchan/common.go
@@ -165,9 +165,11 @@ func (cs *clientSet) sync(timeout time.Duration) error {
 	deadline := time.Now().Add(timeout)
 	// seq remembers the clients and their seqNum at point of entry.
 	seq := make(map[unackedCounter]int64)
+	cs.mu.Lock()
 	for client := range cs.clients {
 		seq[client] = client.seq()
 	}
+	cs.mu.Unlock()
 	for {
 		pending := false
 		cs.mu.Lock()
-- 
2.48.1