diff -r b28e7286990c -r b1f222887c0c src/sim/syscall_emul.cc
--- a/src/sim/syscall_emul.cc	Tue Jul 27 20:00:38 2010 -0700
+++ b/src/sim/syscall_emul.cc	Thu Jul 29 21:42:12 2010 +0100
@@ -118,12 +118,16 @@
 exitGroupFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
               ThreadContext *tc)
 {
-    // really should just halt all thread contexts belonging to this
-    // process in case there's another process running...
-    int index = 0;
-    exitSimLoop("target called exit()",
-                process->getSyscallArg(tc, index) & 0xff);
-
+    ThreadContext *ptc;
+    for(unsigned i = 0; i < process->contextIds.size(); ++i) {
+        ptc = process->system->getThreadContext(process->contextIds[i]);
+        ptc->halt();
+    }
+    if(process->system->numRunningContexts() == 0) {
+        int index = 0;
+        exitSimLoop("target called exit()",
+                    process->getSyscallArg(tc, index) & 0xff);
+    }
     return 1;
 }