From e678ab4e375659fea86b17557c23673033cf897c Mon Sep 17 00:00:00 2001
From: Dmitriy Vyukov <dvyukov@google.com>
Date: Thu, 13 Mar 2014 17:41:08 +0400
Subject: runtime: detect stack split after fork This check would allowed to
 easily prevent issue 7511. Update #7511

LGTM=rsc
R=rsc, aram
CC=golang-codereviews
https://golang.org/cl/75260043
---
 src/pkg/runtime/stack.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/pkg/runtime/stack.c')

diff --git a/src/pkg/runtime/stack.c b/src/pkg/runtime/stack.c
index bb7a32f8ae..d580665e2b 100644
--- a/src/pkg/runtime/stack.c
+++ b/src/pkg/runtime/stack.c
@@ -583,6 +583,8 @@ runtime·newstack(void)
 	Gobuf label;
 	bool newstackcall;
 
+	if(m->forkstackguard)
+		runtime·throw("split stack after fork");
 	if(m->morebuf.g != m->curg) {
 		runtime·printf("runtime: newstack called from g=%p\n"
 			"\tm=%p m->curg=%p m->g0=%p m->gsignal=%p\n",
-- 
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