print tracebacks for all goroutines, not just the crashing one

R=ken
OCL=13518
CL=13518

src/runtime/proc.c

@@ -74,6 +74,21 @@ sys·newproc(int32 siz, byte* fn, byte* arg0)
 //prints("\n");
 }
 
+void
+tracebackothers(G *me)
+{
+	G *g;
+
+	for(g = allg; g != nil; g = g->alllink) {
+		if(g == me)
+			continue;
+		prints("\ngoroutine ");
+		sys·printint(g->goid);
+		prints(":\n");
+		traceback(g->sched.PC, g->sched.SP+8, g);  // gogo adjusts SP by 8 (not portable!)
+	}
+}
+
 G*
 select(void)
 {

src/runtime/rt1_amd64_darwin.c

@@ -149,6 +149,7 @@ sighandler(int32 sig, siginfo *info, void *context)
 	prints("\n\n");
         
 	traceback((void *)ss->__rip, (void *)ss->__rsp, (void*)ss->__r15);
+	tracebackothers((void*)ss->__r15);
 	print_thread_state(ss);
         
 	sys·exit(2);

src/runtime/rt1_amd64_linux.c

@@ -153,7 +153,8 @@ sighandler(int32 sig, siginfo* info, void** context)
         prints("\n\n");
         
 	traceback((void *)sc->rip, (void *)sc->rsp, (void *)sc->r15);
-        print_sigcontext(sc);
+	tracebackothers((void*)sc->__r15);
+	print_sigcontext(sc);
 
 	sys·breakpoint();
 	sys·exit(2);

src/runtime/runtime.c

@@ -19,6 +19,7 @@ sys·panicl(int32 lno)
 	prints("\n");
 	sp = (uint8*)&lno;
 	traceback(sys·getcallerpc(&lno), sp, g);
+	tracebackothers(g);
 	sys·breakpoint();
 	sys·exit(2);
 }

src/runtime/runtime.h

@@ -106,7 +106,7 @@ struct	G
 	byte*	stackbase;	// must not move
 	byte*	stack0;		// first stack segment
 	Gobuf	sched;
-	G*	alllink;	// on allq
+	G*	alllink;	// on allg
 	void*	param;		// passed parameter on wakeup
 	int16	status;
 	int32	goid;
@@ -189,6 +189,7 @@ void*	mal(uint32);
 uint32	cmpstring(string, string);
 void	initsig(void);
 void	traceback(uint8 *pc, uint8 *sp, G* gp);
+void	tracebackothers(G*);
 int32	open(byte*, int32, ...);
 int32	read(int32, void*, int32);
 int32	write(int32, void*, int32);