[GHC] #15449: Nondeterministic Failure on aarch64 with -jn, n > 1

[GHC]

#15449: Nondeterministic Failure on aarch64 with -jn, n > 1
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        Reporter:  tmobile           |                Owner:  tmobile
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  aarch64
 Type of failure:  Compile-time      |            Test Case:
  crash or panic                     |
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by trommler):

 I could reproduce some of the errors on a 970 MP PowerPC running Linux and
 GHC 8.6.1. It looks to me like the issue is not ARM specific. The MVar and
 IORef programs run fine on PowerPC.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15449#comment:18>
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