[GHC] #10174: AArch64 : ghc-stage2 segfaults compiling libraries/parallel

[GHC]

#10174: AArch64 : ghc-stage2 segfaults compiling libraries/parallel
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        Reporter:  erikd                |                   Owner:  erikd
            Type:  bug                  |                  Status:  new
        Priority:  normal               |               Milestone:  7.12.1
       Component:  Compiler             |                 Version:  7.11
      Resolution:                       |                Keywords:
Operating System:  Unknown/Multiple     |            Architecture:  aarch64
 Type of failure:  Building GHC failed  |               Test Case:
      Blocked By:                       |                Blocking:
 Related Tickets:                       |  Differential Revisions:
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Changes (by erikd):

 * owner:   => erikd


Comment:

 Currently `ghc-stage2` segfaults when compiling the file
 `libraries/parallel/Control/Parallel/Strategies.hs`. However, following
 programs not only compile but also run correctly when compiled with the
 `-threaded` flag:

 * Simple "hello world" program.
 * Simple program that uses `forkIO` to create a couple of threads and
 `threadDelay` to exercise the threading before printing something and
 exiting.

 This means I cannot find any small clean test case and will have to debug
 GHC itself.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10174#comment:3>
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