[GHC] #9722: ghcirun004 intermittently fails with ghc: ioManagerWakeup: write: Bad file descriptor

[GHC]

#9722: ghcirun004 intermittently fails with ghc: ioManagerWakeup: write: Bad file
descriptor
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              Reporter:  ezyang      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  highest     |        Milestone:  7.10.1
             Component:  GHCi        |          Version:  7.9
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Runtime     |       Blocked By:
  crash                              |  Related Tickets:
             Test Case:  ghcirun004  |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 For me they never occur when running the test on its own.  They only occur
 during `sh validate --fast`.  The difference, perhaps, is that many tests
 are running at the same time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9722#comment:6>
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