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Stack corruption in derefnull and divbyzero on Windows?
The `derefnull` and `divbyzero` tests appear to fail non-deterministically on Windows (e.g. [this job](https://gitlab.haskell.org/ghc/ghc/-/jobs/402718)), exiting with code 127: ``` cd "rts/divbyzero.run" && ./divbyzero < Wrong exit code for divbyzero(normal)(expected 8 , actual 127 ) *** unexpected failure for divbyzero(normal) ``` I haven't been able to reproduce this locally, but Phyx has under WinDbg. It may also be more likely to occur under PowerShell then Conemu.
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