Imported Upstream version 1.1~hg20130323upstream/1.1_hg20130323

1 files changed, 10 insertions, 2 deletions

diff --git a/src/pkg/runtime/panic.c b/src/pkg/runtime/panic.c
index 2f553f417..d0cf3ad6f 100644
--- a/src/pkg/runtime/panic.c
+++ b/src/pkg/runtime/panic.c
@@ -5,6 +5,7 @@
 #include "runtime.h"
 #include "arch_GOARCH.h"
 #include "stack.h"
+#include "malloc.h"
 
 // Code related to defer, panic and recover.
 
@@ -383,7 +384,10 @@ nomatch:
 void
 runtime·startpanic(void)
 {
-	if(m->mcache == nil)  // can happen if called from signal handler or throw
+	if(runtime·mheap == 0 || runtime·mheap->cachealloc.size == 0) { // very early
+		runtime·printf("runtime: panic before malloc heap initialized\n");
+		m->mallocing = 1; // tell rest of panic not to try to malloc
+	} else if(m->mcache == nil) // can happen if called from signal handler or throw
 		m->mcache = runtime·allocmcache();
 	if(m->dying) {
 		runtime·printf("panic during panic\n");
@@ -398,12 +402,13 @@ void
 runtime·dopanic(int32 unused)
 {
 	static bool didothers;
+	bool crash;
 
 	if(g->sig != 0)
 		runtime·printf("[signal %x code=%p addr=%p pc=%p]\n",
 			g->sig, g->sigcode0, g->sigcode1, g->sigpc);
 
-	if(runtime·gotraceback()){
+	if(runtime·gotraceback(&crash)){
 		if(g != m->g0) {
 			runtime·printf("\n");
 			runtime·goroutineheader(g);
@@ -424,6 +429,9 @@ runtime·dopanic(int32 unused)
 		runtime·lock(&deadlock);
 		runtime·lock(&deadlock);
 	}
+	
+	if(crash)
+		runtime·crash();
 
 	runtime·exit(2);
 }