[Vm-dev] Arm64 MacOS CogSpur crashes when not using mixed arithmetic

Alan Dao alan.n.dao at gmail.com
Fri Nov 4 18:56:09 UTC 2022

I've attached the crash.dmp to this email

On Thu, Nov 3, 2022 at 10:45 PM Alan Dao <alan.n.dao at gmail.com> wrote:

> I've noticed an immediate crash for the CogSpur VM on Arm64 MacOS when we
> set the VM parameters to the following.
> Smalltalk vmParameterAt: 48 put: ((Smalltalk vmParameterAt: 48) bitClear:
> 64) + 64.
> This issue doesn't happen on the Stack VM. Cuis, my main distro, sets this
> VM parameter by default while Squeak does not, but I can cause Squeak to
> crash by running the above command as well.
> I looked at the docs and saw this as the comment for the given bitflag.
> Squeak comment:
> "Bit 6: if set, implies arithmetic primitives will fail if given arguments
> of different types (float vs int)"
> Cuis comment:
> "Bit 6: (on VMs that support it) whether the arithmetic primitives perform
> conversion in case of mixed SmallInteger/Float (not set) or fail (set)
> (on VMs that don't support it, those primitives will fail in those cases)"
> I'm not sure what to make of the functionality, but at the least, it
> shouldn't cause the image to crash when set?
> Best,
> Alan
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