[Vm-dev] Cog crash with AndreasSystemProfiler

[J. Vuletich (mail lists)]

Hi Eliot, Folks,

I found that recent Cog VMs crash when using AndreasSystemProfiler.  
I'm using Cuis https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev ,  
but could reproduce the problem in Squeak4.6-15078 and  
AndreasSystemProfiler from  
http://ss3.gemstone.com/ss/AndreasSystemProfiler.html . I tried on  
Windows 7 and Linux Debian Jessie and saw similar behavior. I could  
try on a Mac if helpful.

To reproduce the problem, evaluate this, several times. Usually  
crashes after 4 or 5 tries:

AndreasSystemProfiler spyOn:[10000 timesRepeat: [3.14159 printString]]

This does _not_ crash in coglinux-15.22.3370 or cogwin-15.22.3370  
(from June 4th). With this VM I can evaluate the expression over 40  
times and never saw a crash.

It does crash on the newer release: cogwin-15.24.3386 and  
coglinux-15.24.3386. It also crashes on the very latest  
cogwin-15.28.3410 and coglinux-15.28.3410. I tried on one machine with  
Win7 and Linux and on another PC with Win7. Results were consistent.

All the crash dumps are attached.

The Linux crash files include these lines at the end:
	stack page bytes 4096 available headroom 2788 minimum unused headroom 3004
	(Segmentation fault)

The Windows crash files include a "Stack backtrace" and a "Smalltalk  
stack dump".

Thanks in advance for your help.

Regards,
Juan Vuletich
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