[GHC] #9525: +RTS -xc stack trace sometimes reported twice

[GHC]

#9525: +RTS -xc stack trace sometimes reported twice
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        Reporter:  osa1              |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Profiling         |              Version:  7.8.3
      Resolution:                    |             Keywords:  profiling,
                                     |  stack trace, error
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * priority:  low => normal
 * component:  Runtime System => Profiling


Comment:

 Some duplicates stack traces in this output as well, with a profiled
 `ghc`: http://lpaste.net/1842576927450202112.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9525#comment:1>
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