[GHC] #13434: hs_try_putmvar003 is timing out / segfaulting

[GHC]

#13434: hs_try_putmvar003 is timing out / segfaulting
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           Reporter:  ezyang         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Runtime        |           Version:  8.1
  System                             |
           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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 This is basically reproduceable every time I validate. During validation,
 the program times out, but when I run it by hand, it segfaults. Running in
 debug sanity mode, I get:

 {{{
 hstry: internal error: MVAR_CLEAN on mutable list
     (GHC version 8.3.20170316 for x86_64_unknown_linux)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug

 }}}

 Simon Marlow, I'm happy to investigate more if you can't repro.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13434>
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