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?
----------------------------- 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