[GHC] #7149: Heap profiling restricted with retainers (+RTS -hrfoo -hc) segfaults

[GHC]

#7149: Heap profiling restricted with retainers (+RTS -hrfoo -hc) segfaults
---------------------------+------------------------------------------------
 Reporter:  akio           |          Owner:                
     Type:  bug            |         Status:  patch         
 Priority:  normal         |      Component:  Profiling     
  Version:  7.5            |       Keywords:                
       Os:  Linux          |   Architecture:  x86_64 (amd64)
  Failure:  Runtime crash  |       Testcase:                
Blockedby:                 |       Blocking:                
  Related:                 |  
---------------------------+------------------------------------------------
Changes (by akio):

  * status:  new => patch


Comment:

 The issue seems to be that the retainer profiling code tries to write to a
 NULL file pointer.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7149#comment:1>
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