- Determine whether the simulator is being used in globals.h

runtime/vm/snapshot.cc

Index: runtime/vm/snapshot.cc
diff --git a/runtime/vm/snapshot.cc b/runtime/vm/snapshot.cc
index d9249db1d39e92b68cd45b38f272bac9b389c73b..6bce49759d8c85b5d296bb4135e99689163bdbab 100644
--- a/runtime/vm/snapshot.cc
+++ b/runtime/vm/snapshot.cc
@@ -596,8 +596,10 @@ RawApiError* SnapshotReader::VerifyVersion() {
                 Version::SnapshotString(),
                 actual_version);
     free(actual_version);
-    const String& msg = String::Handle(String::New(message_buffer));
-    return ApiError::New(msg);
+    // This can also fail while bringing up the VM isolate, so make sure to
+    // allocate the error message in old space.
+    const String& msg = String::Handle(String::New(message_buffer, Heap::kOld));
+    return ApiError::New(msg, Heap::kOld);
   }
   Advance(version_len);
   return ApiError::null();