Microsoft.NETCore.App\8.0.8\coreclr.dll Inventor crashes once per day with no warning or ability to submit crash report.

[kbear2AYYK]

I have a users who's Inventor Crashes once or more per day.

The crash always follows with:
Faulting module path: C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.8\coreclr.dll

Things we’ve done:

Reformatted his hard drive

Re-Installed Windows

Updated windows to the current

Updated all drivers

Updated system bios and firmware

Update Nvidia’s driver to newest

Reinstalled Autodesk to current version

I did not install any add on’s to inventor and delayed adding extra software. The only similarity on Inventor’s side is the library and some simple illogic. The only products reinstalled on the computer side of the fresh install are Adobe products and 3DConexxion Space mouse have been installed. It still crashes. 

One shot in the dark I tried was updating the Microsoft.NETCore.App to 9.0 and renaming the folder to trick inventor into using the new version of coreclr.dll since when it crashes it calls that out. It seemed to work with the update but any time you tried to use the Bill of Materials, it crashed so we weren't able to keep using the new Microsoft.NETCore.App  v9.0

I did a full 8 hour BIOS test on his motherboard, processor, and RAM but that test did not include the Graphics card so I even swapped our identical graphics cards from my pc to his.

So we’ve eliminated:

• Hardware
• Windows Install (including user profiles)
• Most miscellaneous software
• Updates

Are there any beta versions we can test?

Yes, I have a case open but I'm looking to broaden the outreach of this issue. 

[mluterman]

Try doing a clean uninstall per these instructions:

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Perform-a-clean-un...

[kbear2AYYK]

Tried that but it did not work so we reformatted the hard drive and reinstalled windows. Still same issue. 

[johnsonshiue]

Hi! Does it happen randomly or right after certain workflows? Are you running any non-Autodesk Add-Ins? Try turning off all Add-Ins.

Many thanks!

[kbear2AYYK]

Thanks for the advice! 

After we reformatted the PC from the ground up, the only two things we reinstalled were the 3D mouse and Adobe. 

Does any one know what part of inventor accesses coreclr.dll  ???

I know it does when you access the BOM's because it crashes when I tried coreclr.dll V9. 
The licensing portion also uses something in the Microsoft.NETCore.App because AdskUninstallHelper.exe will not run if you try to remove C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.8

Obviously I am grasping at straws here.

[pdxmcad]

coreclr.dll is part of Microsoft .NET, which is used by a considerable portion of Inventor's UI.

[kbear2AYYK]

Thank you, Mike. I will let you know how it goes. 

[kbear2AYYK]

so far... no luck. Still crashing. And again, this is on 2 different machines. One brand new. 

From Windows .wer file

Sig[0].Name=Application Name
Sig[0].Value=Inventor.exe
Sig[1].Name=Application Version
Sig[1].Value=29.0.16200.0
Sig[2].Name=Application Timestamp
Sig[2].Value=65cd0218
Sig[3].Name=Fault Module Name
Sig[3].Value=coreclr.dll
Sig[4].Name=Fault Module Version
Sig[4].Value=8.0.824.36612
Sig[5].Name=Fault Module Timestamp
Sig[5].Value=6696b815
Sig[6].Name=Exception Code
Sig[6].Value=c0000005
Sig[7].Name=Exception Offset
Sig[7].Value=00000000000d22f4

[johnsonshiue]

Hi! Do you have any non-Autodesk Add-Ins? If yes, please disable those. After that, if the crash still persists, you may try disabling "3d Annotation" (right-click in the dialog -> Show Hidden Members) and "Design Checker" (subscription add-in).

Many thanks!

[kbear2AYYK]

For anyone reading this... the conversation has transferred to this forum below:

https://forums.autodesk.com/t5/inventor-forum/invetor-random-crashes-due-to-microsoft-netcore-app-8-...

[kbear2AYYK · Accepted solution]

I am so beyond pleased to say, this is finally over. In May we discovered the issue had to do with dragging and dropping when the user uses the multi-view layout in Inventor. A fix was issued and  tested by us. The official Inventor 2026.1 RC1 is now available which seems to resolve this issue! 

Many thanks to Joel P and his team. 

The moral of this story:
As grateful as I am to have this over please take warning.

I literally have 534 emails over a year timespan related to this ticket in my Outlook. I would estimate over 70% of these emails blamed us.

Long story short, if you have an issue that goes beyond simple clean installs and the alike and Autodesk quickly skips over taking blame and tries to pass the buck on to your internal network, your PC, peripherals, add-ons, software, or your PC's internal hardware (and you are not able to quickly resolve the issue by some simple local diagnostics) and the problem keeps pointing to Autodesk but they will not accept blame, do not go out and reformat the machine multiple times, change graphic cards, buy new hardware, etc...

If you have an issue with an Autodesk product that won't go away... Keep pressuring them until its fixed and avoid accepting blame.