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

[GHC]

#9722: ghcirun004 intermittently fails with ghc: ioManagerWakeup: write: Bad file
descriptor
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                   Owner:  simonmar
            Type:  bug               |                  Status:  patch
        Priority:  high              |               Milestone:  7.10.1
       Component:  Runtime System    |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime crash     |  Unknown/Multiple
      Blocked By:                    |               Test Case:  ghcirun004
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D714
-------------------------------------+-------------------------------------

Comment (by thomie):

 Andreas: if your computer has more than 2 cores you might need to start
 more copies of `ghc -e [0..] > /dev/null`. Another good one to keep the
 cpu is busy is to compile `ghc` with `-j<ncores>` at the same time. Do all
 of that, and then run the `print002` test with `+RTS -I<some small
 number>`. It should work...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9722#comment:20>
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