[Mono-dev] Mono 2.10.1 Can't open a Windows Form on Windows 7 x64

Mark Sciabica msciabica at itracs.com
Mon Mar 7 12:28:04 EST 2011

Hi Guy,

The bug reporting page is here: http://mono-project.com/Bugs

This looks like the problem I ran into, since I was crashing on that same line. I submitted a patch to this list on 2/28. My post got no response, but hopefully someone with commit access will apply it to the official sources.



On 3/5/2011 2:07 AM, Guy Sherman wrote:

I’ve been working on embedding mono in a sandbox game engine I’m working on. I’m running 64bit Windows 7, and I’ve built v2.10.1 of the mono runtime for 64bit, and it seems to have worked…mostly.

I had 2.6.7 working quite well (64-bit, Windows 7, vs2010), loading up a windows form, which then made an internal call (using the mono api for adding functions into the runtime) which attached a DirectX renderer to it, and all was happy. I then wanted some .net 4 features like Xaml and WPF, so I upgraded to 2.10.1, was very pleased with how much easier the build was (only a little bit of mucking about needed to get the 64it build working) but have run into a problem. It seems that any code that creates a windows form crashes the runtime. To make sure it wasn’t my code, I created a simple WindowsFormsApplication1, and ran it first with the Win32 mono.exe that came with the 2.10.1 install – fine. I then ran it with my 64-bit build of mono.exe and it failed – first time I ran I got a crashdump, now it just quits me back to the console window, and I can’t find the crashdump files. This is a standard System.Windows.Form, not a WPF window.

I can, however, tell you where it fails in the mono runtime code because I can debug up to it in my embedding host.

Unhandled exception at 0x000007fee20b8065 (mono-2.0.dll) in SuperNova.exe: 0xC0000005: Access violation reading location 0x0000000200000037.
Mono\metadata\class.c:4681 : if (class->parent && !class->parent->inited)

I have saved a memory dump out of visual studio, but it is 71mb so I’ve nowhere to put it – let me know if you want it.

I’m ok to go back to my builds of 2.6.7 for now – I don’t NEED the .net 4 stuff for the moment.

If there is a more official place to  log this can someone let me know, I’ll be happy to do it.


Guy Sherman
web: http://www.guysherman.com

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