Fatal Execution Engine Error (79FFEE24) (80131506)

Question

I'm encountering problems with my .NET Framework 3.0 SP1 application. It is a C# winforms application communicating with a COM exe. Randomly either the winforms app or the COM exe crashes without any error message and the event log contains this entry:

[1958] .NET Runtime Type: ERROR Computer: CWP-OSL029-01 Time: 11/25/2008 3:14:10 PM ID: 1023 .NET Runtime version 2.0.50727.1433 - Fatal Execution Engine Error (79FFEE24) (80131506)

I could not find any useful information on the MS sites. Does anybody have an idea where I should start my investigation?

tia

Answer 1

Microsoft released a hotfix

https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=16827&wa=wsignin1.0

Answer 2

I had the same behavior when created GCHandle from IntPtr which was pointing not to a managed object.

Answer 3

I had this error, it (luckily) went away by installing 3.5 SP1, which bumps your runtime to version 2.0.50727.3053 (this is a nice version summary).

While hunting for solutions I found a wild range of suspects for this error. Some people even claimed it was the antivirus (!)

YMMV, good luck.

Answer 4

These seem to be mainly caused by a bad install of the framework. See if you can repro the error on another machine, or uninstall/reinstall the Framework bits.

Answer 5

It can be a whole lot of things. Some people repair .NET Framework 3.5, others reinstall .NET alltogether. Some say it's something with PowerCommands, etc. etc. If all else has failed, try what worked for me:
- start VS up in safe mode
- create a new Windows Forms application
- open your toolbox and delete any special tabs (for me, it was a SQLite tab) - close and restart in normal mode

If this doesn't work, good luck!

Answer 6

The hotfix above worked for me!

The described problem occured when opening any *.aspx page in VS in my ASP.NET MVC (RC1) project.