[GHC] #8453: segfault/assertion failure with multi-threaded profiling

[GHC]

#8453: segfault/assertion failure with multi-threaded profiling
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        Reporter:  akio           |            Owner:  akio
            Type:  bug            |           Status:  new
        Priority:  normal         |        Milestone:
       Component:  Profiling      |          Version:  7.7
      Resolution:                 |         Keywords:
Operating System:  Linux          |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by akio):

 The attached patch fixes the assertion failure. However the code still
 segfaults, now inside Haskell code rather than in the RTS. It looks like
 this segfault is new and was not present in b84fbab. I'll continue to
 debug this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8453#comment:2>
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