[GHC] #14890: Make Linux slow validate green

[GHC]

#14890: Make Linux slow validate green
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  alpmestan
            Type:  task              |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  D4546, D4636,
       Wiki Page:                    |  D4712
-------------------------------------+-------------------------------------

Comment (by bgamari):

 It's entirely possible that there is some environment-dependence here. It
 certainly passes somewhat reliably on CircleCI (save a pesky intermittent
 failure of `posix002` which I haven't been able to reproduce locally). See
 the circleci configuration in the tree `.circleci/config.yml` for the test
 configuration.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14890#comment:17>
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