[GHC] #16361: Non-deterministic hs_try_putmvar00 failure on CI

[GHC]

#16361: Non-deterministic hs_try_putmvar00 failure on CI
-------------------------------------+-------------------------------------
           Reporter:  int-index      |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Test Suite     |           Version:  8.9
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 {{{
 Wrong exit code for hs_try_putmvar003(threaded1)(expected 0 , actual 139 )
 *** unexpected failure for hs_try_putmvar003(threaded1)
 }}}

 A quick search suggests that 139 might mean a segfault (SIGSEGV).

 This is a non-deterministic CI failure that happened to me at least two
 times (Feb 12 and Feb 24), and forced me to restart the build job to get a
 green build status. Both times it was the `validate-x86_64-linux-fedora27`
 job, but on different runners (`ghc-ci-gce-x86_64-1` and `maurer.smart-
 cactus.org`).

 Note that another failure that seems to happen only on Fedora is #16350 –
 could it be a problem with the Fedora image?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16361>
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