From cc9ab6d687c72bd32bb68396e4e056d9bd13ea7a Mon Sep 17 00:00:00 2001
From: Konstantin Shaposhnikov <k.shaposhnikov@gmail.com>
Date: Tue, 6 Oct 2015 23:26:43 +0800
Subject: [PATCH] proc: avoid dup chan recv breakpoints

I encountered the error message described in the issue while debugging
InfluxDB. I can confirm that after this fix the error disapeared.

Fixes #258
---
 proc/proc.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/proc/proc.go b/proc/proc.go
index 260898de..b31d45f1 100644
--- a/proc/proc.go
+++ b/proc/proc.go
@@ -334,6 +334,7 @@ func (dbp *Process) setChanRecvBreakpoints() (int, error) {
 	if err != nil {
 		return 0, err
 	}
+
 	for _, g := range allg {
 		if g.ChanRecvBlocked() {
 			ret, err := g.chanRecvReturnAddr(dbp)
@@ -344,6 +345,11 @@ func (dbp *Process) setChanRecvBreakpoints() (int, error) {
 				return 0, err
 			}
 			if _, err = dbp.SetTempBreakpoint(ret); err != nil {
+				if _, ok := err.(BreakpointExistsError); ok {
+					// Ignore duplicate breakpoints in case if multiple
+					// goroutines wait on the same channel
+					continue
+				}
 				return 0, err
 			}
 			count++