Possible X-Wndows problem

[Mark Manning]

I had Cygwin crash on me the other day and was wondering if this is my 
machine doing this (like it ran out of memory or some such) or if it was 
a known problem with Cygwin.

What happened:

I wrote a small program which opened a 400x400 pixel screen and then 
proceeded to write to each pixel varying colors.  The program worked at 
first but after allowing the program to run several hours while it 
randomly wrote colors to the dots (in the proper range of course), 
Cygwin crashed and died leaving the system in an unstable state (ie: I 
had to reboot my Windows box).

System Statistics:

Pentium-4 3.0Ghz cpu
512MB of memory
Standard things like keyboard, optical mouse, scanner, etc....
Lots of hard drive space (11GB free)

Notes:

I was not using OpenGL but was rather using the standard X Windows/Motif 
drawing routines to handle the drawing of the dots.  I am thinking that 
due to the enormous number of times Cygwin had to write a single dot, 
then update the window, that maybe I ran into some kind of a buffer 
overflow.  I have run my test program and Cygwin does die each time. 
 Usually after a couple of hours.  So it takes quite a while to build up 
to whatever it is that is causing this.  I am trying to reduce the 
overall program down to where I can post the example program but if 
anyone has run into this before, I would appreciate an e-mail or a post 
pointing me in the right direction.

TIA to whomever answers.

Mark