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

[GHC]

#15449: Nondeterministic Failure on aarch64 with -jn, n > 1
-------------------------------------+-------------------------------------
        Reporter:  tmobile           |                Owner:  (none)
            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:                    |
-------------------------------------+-------------------------------------

Comment (by Thra11):

 According to
 [https://en.wikipedia.org/wiki/List_of_ARM_microarchitectures]:

 * Cortex-A53: In-order
 * Cortex-A57: Out-of-order
 * Cortex-A72: Out-of-order
 * Denver2: In-order

 In our rather small sample, when failures happen, the CPU has at least one
 out-of-order core.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15449#comment:14>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler