From: Russ Cox <rsc@golang.org>
Date: Mon, 8 Jun 2015 20:22:01 +0000 (-0700)
Subject: runtime: avoid fault in heapBitsBulkBarrier
X-Git-Tag: go1.5beta1~318
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=433c0bc76949fb01bed4747f1d83038ea242a90e;p=gostls13.git

runtime: avoid fault in heapBitsBulkBarrier

Change-Id: I0512e461de1f25cb2a1cb7f23e7a77d00700667c
Reviewed-on: https://go-review.googlesource.com/10803
Reviewed-by: Russ Cox <rsc@golang.org>
---

diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go
index 11bfcd1b27..a4090b9a08 100644
--- a/src/runtime/mbitmap.go
+++ b/src/runtime/mbitmap.go
@@ -388,7 +388,7 @@ func heapBitsBulkBarrier(p, size uintptr) {
 		// unwinding the stack barriers between the current SP
 		// and p's frame.
 		gp := getg().m.curg
-		if gp.stack.lo <= p && p < gp.stack.hi {
+		if gp != nil && gp.stack.lo <= p && p < gp.stack.hi {
 			// Run on the system stack to give it more
 			// stack space.
 			systemstack(func() {