33 lines
849 B
Markdown
33 lines
849 B
Markdown
## Profiling ASP.Net MVC4 apps can lead to Fatal Execution Engine Error
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### Scope
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Edge
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### Version Introduced
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4.5
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### Version Reverted
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4.5.2
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### Source Analyzer Status
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Not planned
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### Change Description
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Profilers using NGEN /Profile assemblies may crash profiled ASP.NET MVC4 applications on startup with a 'Fatal Execution Engine Exception'
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- [ ] Quirked
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- [ ] Build-time break
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### Recommended Action
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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.
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### Affected APIs
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* Not detectable via API analysis
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### Category
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ASP.NET
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[More information](http://connect.microsoft.com/VisualStudio/feedback/details/793730/clr-profiler-crashes-any-asp-net-mvc4-app-on-startup-due-to-ngen-profile-images)
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<!-- breaking change id: 96 -->
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