[IronPython] Any idea what might cause this?

[Michael Foord]

Dan Eloff wrote:
> Hi IronPython team,
>
> Occasionally, when importing one particular module on a background
> thread I get this error:
>
> SystemError: Collection was modified; enumeration operation may not execute.
>
> The offending line is:
>
> class SerializeCustom(_custom_base):
>
> And _custom_base is defined earlier in the module as:
>
> from mycsharpassembly import *
> _custom_base = Serializers.SerializeCustom # from assembly
>
> The problem is a real pain to replicate (i.e. me refreshing the
> browser about 100 times) Hopefully someone will have an idea what
> could cause this. I'm using build 44619, main (2.1 now 2.6) branch.
>   

It looks like importing is still not thread safe - but I guess that bit 
is obvious. I'll leave it to Dino or Curt for a more in depth analysis. :-)

I wonder if a debug build of IronPython for Silverlight would get you 
more information.

Michael

> Thanks,
> -Dan
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