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Simon Marlow authored
Summary: The problem boils down to global variables: in particular gc_threads[], which was being modified by a subsequent GC before the previous GC had finished with it. The fix is to not use global variables. This was causing setnumcapabilities001 to fail (again!). It's an old bug though. Test Plan: Ran setnumcapabilities001 in a loop for a couple of hours. Before this patch it had been failing after a few minutes. Not a very scientific test, but it's the best I have. Reviewers: bgamari, austin, fryguybob, niteria, erikd Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2654
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