[GHC] #15544: Non-deterministic segmentation fault in cryptohash-sha256 testsuite

[GHC]

#15544: Non-deterministic segmentation fault in cryptohash-sha256 testsuite
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by bgamari:

Old description:

> {{{
> $ cabal get cryptohash-sha256-0.11.101.0
> $ cabal new-run -w ghc-8.6.1 --enable-test --allow-newer=cryptohash-
> sha256:base,*:stm,*:tasty,async:base test:test-sha256 -- -j 8
> --quickcheck-tests 9999
> }}}
>
> Eventually the program will start spamming stderr with `test-sha256: lost
> signal due to full pipe: 11` repeatedly.

New description:

 {{{
 $ cabal get cryptohash-sha256-0.11.101.0
 $ cabal new-run -w ghc-8.6.1 --enable-test --allow-newer=cryptohash-
 sha256:base,*:stm,*:tasty,async:base test:test-sha256 -- -j 8
 --quickcheck-tests 9999
 }}}

 Eventually the program will start spamming stderr with `test-sha256: lost
 signal due to full pipe: 11` repeatedly. This apparently only started with
 8.6.1.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15544#comment:3>
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