[GHC] #7993: ghc 7.6 (not 7.4) sometimes hangs at child process exit on s390x

[GHC]

#7993: ghc 7.6 (not 7.4) sometimes hangs at child process exit on s390x
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        Reporter:  cjwatson        |            Owner:
            Type:  bug             |           Status:  new
        Priority:  normal          |        Milestone:
       Component:  Runtime System  |          Version:  7.6.3
      Resolution:                  |         Keywords:
Operating System:  Linux           |     Architecture:  Other
 Type of failure:  Other           |       Difficulty:  Unknown
       Test Case:                  |       Blocked By:
        Blocking:                  |  Related Tickets:
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Changes (by nomeata):

 * difficulty:   => Unknown


Comment:

 I tried to find out if `-V0` helps, but unfortunately it does not.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7993#comment:1>
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