Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_mac.cc
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_mac.cc
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_symbolizer_mac.cc
@@ -121,6 +121,12 @@
   const char *rest = trim;
   char *symbol_name;
   rest = ExtractTokenUpToDelimiter(rest, " (in ", &symbol_name);
+  if (rest[0] == '\0') {
+    InternalFree(symbol_name);
+    InternalFree(trim);
+    return false;
+  }
+
   if (internal_strncmp(symbol_name, "0x", 2) != 0)
     *out_name = symbol_name;
   else