'Fatal Execution Engine Error' using unmanaged obj from 2 appdomai

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redec - 05 Nov 2007 21:42 GMT

I believe I've found a bug in either the compiler or in the runtime....for
some reason when accessing a specific unmanaged object from 2 appdomains it
causes a fatal execution engine error. It took me over a week to narrow it
down, but here's a nice simple snippet of code that showcases this issue:
http://rafb.net/p/Z94NfD16.html

Anyone have any idea what exactly is the root cause of this or how to fix it
properly? It seems that if I change the code much (such as remove the
'virtual' from either of the methods, or change the return types, or change
the dictionary to something else) the problem goes away, but I'm more worried
about where else in my code this affects and I'm hoping for a more viable
solution than "search through 500K lines of code and look for that
pattern"....not realistic

If anyone wants more detail I've put a rar up which contains the source, a
debug build with symbols, the eventlog entry, and an adplus dump with
corresponding reports:
http://www.virgeweb.com/redec/crap/RuntimeFailureTest.rar

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redec - 06 Nov 2007 17:43 GMT

well apparently pastes on rafb.net don't stick around for long....so here's
the source that causes the problem:

#include <msclr/appdomain.h>

using namespace System;
using namespace System::Collections::Generic;
using namespace msclr;

ref class MyManagedClass
{
};

class MyUnmanagedClass
{
public:
virtual MyManagedClass^ Foo() { return nullptr; }
virtual Object^ CrashyCrashy()
{
Dictionary<String^, MyManagedClass^> ^bar = gcnew
Dictionary<String^, MyManagedClass^>();
bar->Add("", nullptr);
return nullptr;
}
};

void Test(MyUnmanagedClass *foo)
{
foo->CrashyCrashy();
}

int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
MyUnmanagedClass foo;
AppDomain ^domain1 = AppDomain::CreateDomain("TestDomainOfGoodness");
call_in_appdomain<MyUnmanagedClass*>(domain1->Id, &Test, &foo);
return 0;
}

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Carl Daniel [VC++ MVP] - 07 Nov 2007 02:00 GMT

> I believe I've found a bug in either the compiler or in the
> runtime....for some reason when accessing a specific unmanaged object
[quoted text clipped - 14 lines]
> dump with corresponding reports:
> http://www.virgeweb.com/redec/crap/RuntimeFailureTest.rar

Interesting. I can repro what you describe, both with VS2005 SP1 and a very
recent build of VS2008.

You might want to contact Microsoft PSS about this - it seems very likely
that what you're encountering is a bug, and charges for support calls are
generally waived if the underlying problem is a bug in the product.

-cd

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redec - 07 Nov 2007 15:40 GMT

> Interesting. I can repro what you describe, both with VS2005 SP1 and a very
> recent build of VS2008.
[quoted text clipped - 4 lines]
>
> -cd

Yeah...I've been trying to avoid that phone call :P....You'd think they'd
have a better way to submit bugs....I've looked on
http://connect.microsoft.com but there doesn't seem to be an appropriate
place for vs-related issues....

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Carl Daniel [VC++ MVP] - 07 Nov 2007 16:13 GMT

>> Interesting. I can repro what you describe, both with VS2005 SP1
>> and a very recent build of VS2008.
[quoted text clipped - 10 lines]
> http://connect.microsoft.com but there doesn't seem to be an
> appropriate place for vs-related issues....

There is (https://connect.microsoft.com/feedback/?SiteID=210), but Connect
is not a path to a solution for a problem that's blocking your progress.
Rather, it's path to get bugs into the system to be fixed in some future
version (at this point, Orcas+1 at the earliest). If you need a short-term
solution, PSS is your option. No guarantees that you'll get a solution that
way, but you surely won't get one through Connect.

I'm not sure where all you've posted, but you might try posting in
microsoft.public.dotnet.framework, where the core CLR experts are more
likely to congregate.

-cd

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'Fatal Execution Engine Error' using unmanaged obj from 2 appdomai

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