System.ExecutionEngineException problem

[John]

I have a stable app developed on ASP.NET 1.1 that I'm porting to 2.0.

However, I've noticed that on one page, if I click a button to perform some
business logic (which runs fine), then click on a hyperlink to move to a
different page, I get a 'System.ExecutionEngineException' exception. There
is no line highlighted in the debugger.

I'm not using interop or other threads.

Event viewer shows:

..NET Runtime version 2.0.50727.42 - Fatal Execution Engine Error (7A05E2B3)
(80131506)

I also sometimes see:

aspnet_wp.exe (PID: 2324) stopped unexpectedly.

It fails predictably on the dev web server in VS2005, less regularly on IIS
(although it does still fail).

I've tried to create a simplified program to reproduce the problem - so far
without success. However I did notice that the problem was worsened by some
code returning an array (15-20) of small Dictionary<> objects. I added a
conversion routine to turn them into arrays of structs, and some of the
problems went away. Is this something to do with memory-shortage?? My PC has
800mb, with around 80mb free when running the code.

Whats going on??? Is this a bug in .NET2, or is there something stupid in my
code? Advice would be welcome!!

XP Pro sp2, .NET 2.0.50727.42, VS2005, SQL2005

Thanks,

John

 

[John]

I've reported this to Microsoft, and they can reproduce the problem. I'll
post an update when I know more.

John

 

[John]

Microsoft report the problems stems back to a Dictionary<decimal,double>
instance.

Looks like the CLR can't cope with this for some reason. Be afraid.....

John