I found reproducing the issue a bit tricky as I could only reliably do so with a specific VM version and VM parameters applied. The combination provided here reproduces the crash every time on my system running Debian 9 (Stretch) and should run in about 5-10 minutes depending on the speed of your system. Steps to reproduce: ./squeak.sh doit on the first expression in the Workspace cng-crash-console-output.txt - output from the console when run on my system