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Created attachment 723 [details]
Test case which can reproduce the race condition.
This bug was reported in Novell Bugzilla here: https://bugzilla.novell.com/show_bug.cgi?id=675362
I also posted to the Mono-devel mailing list a similar report with test case and a possible revision in which the problem began to appear with a test case. The Novell bug was reported on Linux, I've experienced it on Mac and Windows.
The original attachment is included here as well as DownloadTest.cs
We've started to notice issues with another app we have (built on Mono 2.10.1 as well) when uploading files which caused me to report the issue here.
There have been multiple fixes to issues in the threadpool that could affect this code. You should try this with the latest release in the 2.10.x series (2.10.6)
Closing this bug since there has been no response in 2 years.