I found automated way how to check problem:
p := [ Object basicSize ] fork. p suspend.
3 timesRepeat: [p step: p suspendedContext]. newContext := p completeStep: p suspendedContext. newContext selector. "=> doesNotUnderstand:" newContext arguments first selector == 0
2016-12-05 15:08 GMT+01:00 Denis Kudriashov dionisiydk@gmail.com:
2016-12-05 15:07 GMT+01:00 Denis Kudriashov dionisiydk@gmail.com:
I attach crash file. When I try it second time. After step over I got DNU error which shows very strange thing that 0 integer was sent as message. And when I click on basicSize method image crashed. Then I try to get same behaviour but can't. Image crash when I press step over debugger button. (dump file about this case)
It is on one of latest pharo 6 image and mac os VM (dump includes this information I guess)