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FAQ: Stability

How stable is Squeak? It seems to be remarkably robust.

It is very stable. Ted Kaehler

Normally, when you crash Squeak, you've found a VM bug, which needs to be fixed, but this case is rather rare, since the VM is relatively small and is mostly auto-generated from Smalltalk code, which has been subject to a lot of debugging...

Actually, apart from VM bugs, there are ways of crashing a Smalltalk system. It's just much more difficult to do it unintentionally than in C or C++.
You can use low-level system primitives such as #become: between system-critical objects to mess up the system, or you can break basic assumptions that the VM makes without checking on every occasion:

Hans-Martin Mosner