On Sat, Feb 15, 2014 at 08:08:19PM -0500, David T. Lewis wrote:
> Yikes! Good catch, thank you.
> 
> This very likely *is* a VM problem. I can reproduce it with a standard
> interpreter VM, and the crash does not happen when I run the same thing
> on Cog.


The problem happens in SpaceTally>>spaceForInstancesOf:

This eventually does "CompiledMethod basicNew" which crashes the VM.

CompiledMethod class>basicNew seems to cause problems with both Cog and
interpreter VM, so I may have been wrong in saying that the issue was
specific to the interpreter VM.

The format of CompiledMethod is special (see its class comment), and it
appears that #basicNew is problematic.

Dave


> 
> To reproduce:
> 
> Help -> About this System, then select "Space Analysis" in the System
> Reporter. Result is:
> 
> Segmentation fault
> 
> 17369460 Behavior>new
> 17369368 Fraction class>numerator:denominator:
> 17369272 SmallInteger>/
> 17369180 Number>roundUpTo:
> 17369088 SpaceTally>spaceForInstancesOf:
> 
> Dave
> 
> 
> On Sat, Feb 15, 2014 at 11:58:29PM +0100, Michael wrote:
> > Hi,
> > 
> > I am new to squeak and smalltalk, but I noticed the 4.5 release notes
> > mention a "System space analysis" feature/function.
> > However when I try it, I consistently crash the virtual machine with a
> > segmentation fault.
> > 
> > I have tried both on a Raspberry Pi with the latest version of the
> > virtual machine and on 64 bit Slackware 14.1 with version 4.10.2.2614
> > from slackbuilds.org. So I assume it is not a VM problem.
> > 
> > The complete output from the command line is:
> > bash-4.2$ squeak Squeak4.5-13675.image
> > CHECKING cogvm
> > which: no cogvm in (/usr/bin:/bin)
> > CHECKING squeakvm
> > 
> > Segmentation fault
> > 
> > 17254592 Behavior>new
> > Segmentation fault
> > 
> > 
> > Michael