Index: lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
===================================================================
--- lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
+++ lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
@@ -383,7 +383,7 @@
   const char *path = common_flags()->external_symbolizer_path;
   const char *binary_name = path ? StripModuleName(path) : "";
   if (path && path[0] == '\0') {
-    VReport(2, "External symbolizer is explicitly disabled.\n");
+    Report("WARNING: External symbolizer is explicitly disabled.\n");
     return nullptr;
   } else if (!internal_strcmp(binary_name, "llvm-symbolizer")) {
     VReport(2, "Using llvm-symbolizer at user-specified path: %s\n", path);
@@ -424,6 +424,9 @@
       return new(*allocator) Addr2LinePool(found_path, allocator);
     }
   }
+  Report("ERROR: symbolization is requested, but a symbolizer could "
+         "not be found: external symbolizer is not set, and there's "
+         "no llvm-symbolizer or addr2line in PATH\n");
   return nullptr;
 }