Program and debugger quit without indication of problem

Question

I'm developing a WPF application. When debugging, the logic reaches a certain point, then the application quits for no reason. VS debugger catches nothing and the only indication of a problem is the following in the output window:

The program '[6228] SomeApp.vshost.exe: Managed (v4.0.30319)' has exited with code 1073741855 (0x4000001f).

When debugging the release version, or indeed running the debug build out of the debugger (in fact all combos that aren't running the debug version in debugger), everything works fine.

I'm trying to catch unhandled exceptions with the following code:

        AppDomain             .CurrentDomain             .UnhandledException +=             (sender, e) =>             {                 Debug.WriteLine("Unhandled Exception " + e.ExceptionObject);             };         Application             .Current             .DispatcherUnhandledException +=             (sender1, e1) =>             {                 Debug.WriteLine("DispatcherUnhandledException " + e1.Exception);             }; 

...but I'm not catching anything.

I'm considering peppering the app with debug output statements, but it's highly asynchronous so reading this will be both arduous and tedious.

How do I start figuring what is going on?

Answer 1

According to ntstatus.h file, 0x4000001f (STATUS_WX86_BREAKPOINT) is an exception status code that is used by the Win32 x86 emulation subsystem. It (I suppose) means that you reached a breakpoint which is not exploitable. You should enable debugging unmanaged code.

Answer 2

Using Visual Studio 2012 (Version 11.0.50727.1 RTMREL), the only solution I found was to go to Project -> Properties -> Debug and turn off "Enable the Visual Studio hosting process".

The option "Enable native code debugging" did not help even though I had all exceptions set to break-when-thrown.

Interestingly, this problem only started happening when I upgraded from VS2012 beta to the VS2012 official release.