GKlib triggerred an errexit when calling gk_mcorePop->gk_free with multi-thread

[whaleeej]

Hi developer,

This is an issue happening with multi-threading. When using Metis::METIS_PartGraphRecursive in one thread, everything works ok. However, switching to parallel calls triggers a wired error related to "mallac&free", as illustrated by following image.

I have tried to make the static int gk_exit_on_error = 0. But further incertain access voliation would be thrown.

[mapret]

I had the same crash with MSVC (which based on your screenshot you are also using), which I fixed in PR #31 .