[GHC] #14705: ghc-iserv sometimes segfaults in profiled way

[GHC]

#14705: ghc-iserv sometimes segfaults in profiled way
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Profiling      |           Version:  8.5
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Runtime crash
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I have seen a few testsuite failures due to `ghc-iserv` crashes like
 these,

 {{{
 --- ./profiling/should_run/T5363.run/T5363.stdout.normalised    2018-01-22
 18:57:49.401773263 +0000
 +++ ./profiling/should_run/T5363.run/T5363.run.stdout.normalised
 2018-01-22 18:57:49.401773263 +0000
 @@ -1 +1 @@
 -1250030000000
 +ghc-stage2: ghc-iserv terminated (-7)
 *** unexpected failure for T5363(ghci-ext-prof)

 Actual stdout output differs from expected:
 --- ./profiling/should_run/scc001.run/scc001.stdout.normalised  2018-01-22
 18:57:45.177724120 +0000
 +++ ./profiling/should_run/scc001.run/scc001.run.stdout.normalised
 2018-01-22 18:57:45.177724120 +0000
 @@ -1,3 +1,3 @@
  True
  3
 -'a'
 +ghc-stage2: ghc-iserv terminated (-11)
 *** unexpected failure for scc001(ghci-ext-prof)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14705>
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