dotnet/Documentation/compatibility/profiling-asp_net-mvc4-apps-can-lead-to-fatal-execution-engine-error.md

Profiling ASP.Net MVC4 apps can lead to Fatal Execution Engine Error

Scope

Edge

Version Introduced

4.5

Version Reverted

4.5.2

Source Analyzer Status

Not planned

Change Description

Profilers using NGEN /Profile assemblies may crash profiled ASP.NET MVC4 applications on startup with a 'Fatal Execution Engine Exception'

• Quirked
• Build-time break

Recommended Action

This issue is fixed in the .NET Framework 4.5.2. Alternatively, the profiler may avoid this issue by specifying COR_PRF_DISABLE_ALL_NGEN_IMAGES in its event mask.

Affected APIs

• Not detectable via API analysis

Category

ASP.NET

More information