I have rebuild a working VM from 020c80f357c8164e26f37cefea8c50b92bae7fa8 (CogVM source as per VMMaker.oscog-eem.2751 - may 8)
But this one segfaults: ee89a4dad04442463252b6a368a8ba373288a774 (Merge branch 'Cog' of https://github.com/OpenSmalltalk/opensmalltalk-vm into Cog - may 9)