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Non-deterministic segmentation fault in cryptohash-sha256 testsuite
``` $ cabal get cryptohash-sha256-0.11.101.0 $ cd cryptohash-sha256-0.11.101.0 $ cabal new-run -w ghc-8.6.1 --enable-test --allow-newer="*:base,*:stm,*:tasty" 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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