[GHC] #15544: Non-deterministic segmentation fault in cryptohash-sha256 testsuite

[GHC]

#15544: Non-deterministic segmentation fault in cryptohash-sha256 testsuite
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 @osa1 what makes you suspect the STM fix? @bgamari's earlier debugging
 seemed to suggest that it was SRT-related, in particular if we're crashing
 in `stg_IND_STATIC` that usually indicates a CAF has been GC'd too early.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15544#comment:16>
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