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Created attachment 1574 [details]
When using AsOrdered() or orderby with Parallel LINQ the code goes into an infinite loop.
This causes the following 19 unit tests in ParallelEnumerableTests.cs to hang when they are run:
What version of Mono are you using? Unit tests have been running fine for us and I checked your attachment which works too here (mono master).
Could you also attach /proc/cpuinfo content please?
I have rerun the tests on the latest git and the tests now pass.
Looking at the history for these tests on wrench (http://wrench.mono-project.com/Wrench/ViewWorkTable.aspx?lane_id=14&host_id=10&command_id=214) it looks like the issue was fixed in a commit between the 28th march and the 5th April.
Bug can be closed.