[Vm-dev] New spur crash detected
asqueaker at gmail.com
Mon Feb 8 19:19:25 UTC 2016
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:
> 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,
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