Re: [Haskell-cafe] Debugging a test suite freeze

I don't see anything about test suites freezing/looping in that ticket. Did you mean a different one? Note: it seems pretty clear that my test suite is *not* looping: when it freezes, the process doesn't burn CPU or memory. It seems there's a deadlock somewhere, but it's all *extremely* mysterious to me. Most mysteriously, only the last test case seems to lead to this problem, and it does so even when *dramatically* simplified in various ways (e.g., if I just `liftIO (print s)` instead of traversing with an arbitrary function, and then finish off with `3 === 3`). It would be easy to believe that the problem was in my Hedgehog test case generation code if not for the fact that it works reliably on all versions of GHC from 7.8 through 9.2! So either something is wrong with GHC 9.4 or using 9.4 is getting me a bad version of some dependency. On Wed, Nov 30, 2022 at 10:36 PM Doug Burke wrote:

I had a test suite loop indefinitely with ghc 9.4.3 - see https://gitlab.haskell.org/ghc/ghc/-/issues/22416 - but to be honest I don't really understand what the code did that lead to the problem, so dont know how relevant it is for you.

Doug

On Wed, Nov 30, 2022 at 5:46 PM David Feuer wrote:

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In particular, I think tasty does some tricky concurrency. Have there been changes in that recently, either in GHC itself or in async, that might be responsible?

On Wed, Nov 30, 2022, 5:33 PM David Feuer wrote:

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The logict-sequence test suite consistently freezes up on the last test when compiled with GHC 9.4.3. logict-sequence and its test suite don't do anything special with that GHC/base version as far as I can see, or anything particularly strange in general, so I'm pretty confident the problem lies elsewhere. My best guesses are hedgehog, tasty, and tasty-hedgehog. Has anyone else run into weird issues with any/all of these on GHC 9.4.3?

David

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