[Vm-dev] New spur crash detected

[Chris Muller]

I have seen this a few times too, where an object on the debugger
stack, that should definitely not be a SmallInteger, is.  And so the
DNU is always, SmallInteger DNU someMessage.

But I never could reproduce it.  Good find.

On Mon, Feb 8, 2016 at 11:43 AM, Denis Kudriashov <dionisiydk at gmail.com> wrote:
>
> Hi.
>
> I found reproducible problem with forwardBecome. It exists on Pharo and Squeak. For Pharo we get issue 17536.
>
> 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
>