When you run web tests in Microsoft Visual Studio 2010 or Microsoft Test Manager (MTM), the test controller (QTcontroller.exe), or Visual Studio (Devenv.exe) crashes or stops responding if the test results are too large. Specifically, this issue occurs if the test results (.webtestresults) file is 1.5 gigabytes (GB) or larger. Additionally, an exception occurs and you receive the following error message:
(QTController.exe, PID <n>, Thread <n>) TcmRunner: Unhandled exception for run [90]: Internal Error!
Failed to acquire a ReaderLock
Failed to acquire a ReaderLock