From 9aee98def8e6c6ce6af36ffab1348c1f9356e316 Mon Sep 17 00:00:00 2001
From: Alex Brainman <alex.brainman@gmail.com>
Date: Tue, 15 Oct 2013 14:37:43 -0400
Subject: [PATCH] undo CL 14231047 / 2f4c2dde2756
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undone because the change slows down profile collection
significantly and unpredictable at times (see comments
at https://golang.org/cl/14231047 for details)

««« original CL description
runtime: collect profiles even while on g0 stack

Fixes #6417

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/14231047
»»»

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/14535046
---
 src/pkg/runtime/os_windows.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pkg/runtime/os_windows.c b/src/pkg/runtime/os_windows.c
index 44c9b342de..c3e296aa67 100644
--- a/src/pkg/runtime/os_windows.c
+++ b/src/pkg/runtime/os_windows.c
@@ -402,7 +402,7 @@ profilem(M *mp)
 		tls = runtime·tls0;
 	gp = *(G**)tls;
 
-	if(gp != nil) {
+	if(gp != nil && gp != mp->g0 && gp->status != Gsyscall) {
 		// align Context to 16 bytes
 		r = (Context*)((uintptr)(&rbuf[15]) & ~15);
 		r->ContextFlags = CONTEXT_CONTROL;
-- 
2.50.0