[GHC] #12800: hs_try_putmvar003 sometimes fails

[GHC]

#12800: hs_try_putmvar003 sometimes fails
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Runtime        |           Version:  8.1
  System                             |
           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:
-------------------------------------+-------------------------------------
 The `hs_try_putmvar003` test appears to (unfortunately quite infrequently)
 crash.
 {{{
 [1 of 1] Compiling Main             ( ../mk/ghc-config.hs, ../mk/ghc-
 config.o )
 Linking ../mk/ghc-config ...
 Looks like you don't have timeout, building it first...
 Timeout is 300
 Found 360 .T files...
 Beginning test run at Wed Nov  2 20:43:04 2016 EET
 Wrong exit code (expected 0 , actual 139 )
 Stdout:
 Stderr:
 /bin/sh: line 1: 31186 Segmentation fault: 11  ./hs_try_putmvar003 1 16 32
 100
 }}}

 [[https://phabricator.haskell.org/harbormaster/build/14760/?l=0|Here]] is
 a representative example from Harbormaster

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12800>
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