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Up and Coming
March 2, 2015

My VR unity experience keeps crashing with a ntdll.dll error

Hey everyone,

I'm working on a VR social world called Convrge where people can meet up and hang out with others. I thought I would lead with this since our build is public so if anyone is able to reproduce my error and knows a solution please let me know! Download is at http://www.convrge.co

Our latest build runs fine on my Macbook pro and most every other mac or win rig I've loaded it onto or that our users have. This seems to be a very niche problem / something specific to my machine. I can stay in the experience for about 5 - 10 mins on average before being kicked and seeing the below ntdll.dll error message. Sometimes it's instant as soon as I load the world, sometimes it takes 15 mins, there doesn't seem to be a pattern:

Error message I see after the game crashes: http://i.imgur.com/ZTjbCtL.jpg

Full text of the error:
---------
Problem signature:
Problem Event Name: APPCRASH
Application Name: Convrge_Win_0.10.exe
Application Version: 4.6.1.51269
Application Timestamp: 54819edb
Fault Module Name: ntdll.dll
Fault Module Version: 6.3.9600.17031
Fault Module Timestamp: 5308893d
Exception Code: c0000005
Exception Offset: 0003fd12
OS Version: 6.3.9600.2.0.0.768.101
Locale ID: 1033
Additional Information 1: 46d1
Additional Information 2: 46d1c12205ae881d9878aa5b56fc9648
Additional Information 3: 3eba
Additional Information 4: 3ebaf8d2848cbfbab57d22308d930cdb
---------

I've seen people include their dxdiag.txt file for reports like this so here's mine (attached)

And here's the laptop itself: http://www.amazon.com/G750JM-DS71-17-3- ... B00IKF2H12

At one point I thought this error was being caused by other clients connecting to the game, but I've been testing it tonight with no one but myself in the world and the error still occurs. I've tried rolling back my Nvidia drivers one version at a time for about 4 versions with no success. I'm back on the latest Nvidia drivers now. I've installed all available win 8.1 updates. Unity is version 4.6.1 due to a plugin were using that isn't supported on any further versions.

This bug seems to occur randomly and not associated with any particular part of the world, other users, character movement, etc.

Please let me know if you need any more info. We're heading to GDC in two days and would really like to show our stuff on this machine without it crashing all the time :(

Thanks so much!

    26 replies

    shawncw1Author
    Up and Coming
    May 11, 2015
    We continue to have users experiencing this win 8.1 bug / crash. Looks like its related to direct X. Still no guidance on this?

    Thanks
    Participant
    May 14, 2015
    I am having the same issue on my project. I will say something if I manage to solve it. Good luck!
    Participant
    May 14, 2015
    I saw this post http://answers.unity3d.com/questions/606686/unity-432-crashed-on-startup.html and I think it solved the issue ("right click, run with graphics processor, high performance NVIDIA processor").

    I truly hope it works for you as well!

    Good luck
    Inspiring
    May 14, 2015
    Thanks for sharing.
    AMD Ryzen 7 1800X | MSI X370 Titanium | G.Skill 16GB DDR4 3200 | EVGA SuperNOVA 1000 | Corsair Hydro H110i Gigabyte RX Vega 64 x2 | Samsung 960 Evo M.2 500GB | Seagate FireCuda SSHD 2TB | Phanteks ENTHOO EVOLV
    Participant
    May 15, 2015
    The fix I found worked for the Oculus version only. For the no-Oculus Unity build, I created a shortcut and added " -force-d3d9" and, so far, I think it worked :)
    Participant
    May 24, 2015
    Out of nowhere the problem is back... If anyone found a more permanent solution to this problem, please let us know