[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] CoverageWrapper VM crash Squeak (#267)

[Jascha Beste]

@eliotmiranda 
I'm not Fabio but maybe I can still help you with reproducing or at least leading you on the right track.
So I encountered the problem initially, when using smalltalk-ci with coverage testing enabled.
To reproduce it that way, I created a [branch with coverage testing enabled on Acceptit](https://github.com/hpi-swa-teaching/AcceptIt/tree/coveragewrapper-crash).  

If you checkout that one and let smalltalkci run, you will encounter the crash. You can also checkout the crash on travis: https://travis-ci.org/hpi-swa-teaching/AcceptIt/builds/404108169 (This is with a very old vm version though) But when reproducing locally with a newer vm version the crash is identical.

Interestingly though if **starting the tests manually** in the image with coverage enabled it works **without any crashes**. So to reproduce manually, you'd have to start the tests the exact same way that smalltalkci does, which I didn't manage to do yet. But Fabio probably can help with that.

I hope this helps.

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