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The stacktrace points to MonoTouch_Disposer.Drain (managed) and NSAutoreleasePool release] (native). So I strongly suspect that the issue is not related to the above code (which is not using NSObject and objectiveC references).
Could you attach the "crash dump" (you can get it from XCode) to the bug report ? That will show us every thread (not just the one who crashed). Maybe that will give us some hints. Otherwise we'll likely need a test case (or your application) to pinpoint the issue.
Thanks for the crash report.
Thread #0 is where the crash occurs but the List<> code you're running looks like it executes on Thread #8. So your problem is not related to code you pasted on the original bug's description.
Something else is occuring on that thread and we'll need more information (e.g. a test case to duplicate the issue or access to your application*) to debug this.
* you can contact firstname.lastname@example.org to get NDA paperwork (if required)
Please re-open if you still have similar issues and include a test case that will allow us to reproduce the issue.