[Bugs] #2512 UNSP: physics crashes if you make a make a scribbly ball with the pen

[Sugar Labs Bugs]

#2512: physics crashes if you make a make a scribbly ball with the pen
------------------------------------------+---------------------------------
    Reporter:  carrott                    |          Owner:  garycmartin                
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Physics                    |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Status_field:  Unconfirmed                |   Distribution:  Dextrose                   
   Seeta_dev:                             |  
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 Physics 7 on dextrose os5dx2.

 I was trying to draw a pendulum, using the pen start at the top of the
 screen and go straight down and into a big scribbly ball. If you do it
 right (happens about 2 times out of 3 for me), physics will segfault and
 dissappear.

 See attached GDB session.

 I've seen this in a number of builds but only just got round to reporting
 it properly.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2512>
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