Index: lldb/trunk/source/API/SBProcess.cpp
===================================================================
--- lldb/trunk/source/API/SBProcess.cpp
+++ lldb/trunk/source/API/SBProcess.cpp
@@ -1180,6 +1180,9 @@
   if (!process_sp)
     return false;
 
+  std::lock_guard<std::recursive_mutex> guard(
+      process_sp->GetTarget().GetAPIMutex());
+
   InstrumentationRuntimeSP runtime_sp =
       process_sp->GetInstrumentationRuntime(type);