[Vm-dev] New spur crash detected

[Denis Kudriashov]

Hi.

I found reproducible problem with forwardBecome. It exists on Pharo and
Squeak. For Pharo we get issue 17536
<https://pharo.fogbugz.com/f/cases/17536/VM-Crash-when-adding-an-iVar-to-a-subclass-of-SystemAnnouncement>
.

Try to execute following script:

obj1 := 20 at 10.
obj2 := 50 at 30.

weak := WeakValueAssociation new.
weak key: obj1..

obj1 becomeForward: obj2.
Smalltalk garbageCollect.
weak key class. "-> SmallInteger. If you try to print 'weak key' image will
crash"



Lines with become and garbage collection should be executed together.
Instead anything is working correctly. So it is somehow related to stack
state.

Interesting that WeakArray is working correctly. Try script with

weak := WeakArray new: 1.
weak at: 1 put: obj1.

Best regards,
Denis
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