I have been experiencing strange crashes running Tk on Linux (OpenSuse 13.1)
on my i5-2500K. In some respect this must be a video driver problem, since
if I replace the intel driver with the (very slow) framebuffer driver, the
crash does not occur.

However, there is a dependence on what you are doing in Tk. Drawing lines
on a canvas causes a crash of X iff _all_ of the following conditions are met:
 1. lines extend outside visible area of canvas
 2. lines are smoothed
 3. lines are dashed
 4. lines are 1 pixel wide

There's a litle test program below. I'd be interested if it crashes for
anyone else's i5-2500K, or if something is peculiar about mine.

As it stands, this program does not crash.
If I edit the canvas dimensions to 400x400 it does.
If I change the comments to enable one of the alternative canvas create
statements it does not crash, even on the smaller canvas.

Does anyone understand what's really going on?

[APN] The Wiki is really not a good place for reporting bugs/crashes. You will
likely get better response by filing a ticket at http://core.tcl.tk/tk/reportlist
Also, please state the Tcl/Tk version.

----------------------------- cut here -------------------------------
 #! /usr/bin/env tclsh

 # WARNING THIS WILL DESTROY ANY FILE NAMED crash_count

 package require Tk

 set pts {512 88 473 49 346 112 229 229 112 346 49 473\
         88 512 127 551 254 488 371 371 488 254 551 127}

 proc main {} {
   canvas .c -width 600 -height 600 -bg white
   pack .c -fill both -expand 1
   
   file delete crash_count
   set c 0
   for {set i 0} {$i < 1000} {incr i} {
      set cc [format "#%03x" [expr {$c % 4096}]]
     .c create line $::pts -fill $cc -smooth raw -splinesteps 99 -dash {3 3}
 #     .c create line $::pts -fill $cc -width 2 -smooth raw -splinesteps 99 -dash {3 3}
 #     .c create line $::pts -fill $cc -smooth raw -splinesteps 99
 #     .c create line $::pts -fill $cc -dash {3 3}

      update idletasks
      incr c
      set f [open crash_count w]
      puts $f $c
      close $f
   }
   puts done
 }

 main