On Wed, May 31, 2017 at 10:23 PM, horrido <[hidden email]> wrote:

I have a puzzling bug. I've narrowed the scenario down to this code:

Cranky»initA
   a := ((StringMorph contents: '####') color: Color white) position: (0@0).
   m addMorph: a

Cranky»initialize
   f := Form fromFileNamed: 'hot_air_balloon_mysticmorning.jpg'.
   m := ImageMorph new.
   m form: f.
   self initA.
   m openInWindowLabeled: 'Cranky'.
   delay := (Delay forSeconds: 5).
   [ [ true ] whileTrue: [ a contents: 0 asString. delay wait ] fork

I can run this application for hours and hours with no problem. However, if
I run it for a while and then close the application and then save/exit the
image, the next time I start the image, there is some likelihood it will
crash dump. The probability is something like 5-10%.

Interestingly, if I remove the statement...

a contents: 0 asString.

from the infinite loop, I've not been able to replicate the crash. Is there
something wrong with the way I'm updating the contents of the StringMorph?

Can you try a few other variations... 

   [ [ true ] whileTrue: [ 0 asString. delay wait ] fork.

   [ [ true ] whileTrue: [ a contents: '0'. delay wait ] fork.

   [ [ true ] whileTrue: [ a contents: '0'. ] forkAt: 20.

cheers -ben