Looking at the end of the backtrace:

Core was generated by `pan'.
Program terminated with signal 11, Segmentation fault.
#0  0xb79281f9 in cairo_xlib_surface_get_display () from /usr/lib/libcairo.so.2
#1  0xb790d7b1 in cairo_surface_reference () from /usr/lib/libcairo.so.2
#2  0xb7901fdc in cairo_font_options_create () from /usr/lib/libcairo.so.2
#3  0xb78fc844 in cairo_show_glyphs () from /usr/lib/libcairo.so.2

In Cairo 1.2.4 and earlier (I looked back to 1.0.0) there is
no code path between cairo_show_glyphs() calling cairo_font_options_create()
or between cairo_surface_reference() calling cairo_xlib_surface_get_display()
so there must be some other corruption problem happening.

There is a small chance this is the same thing as
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=383034
which has something that looks like an upstream fix in
  https://bugs.freedesktop.org/show_bug.cgi?id=7953
if we believe the problem is in #3 cairo_show_glyphs() and
think anything above that is bogus.

Otherwise, I'll need a backtrace against cairo compiled with debugging
on.

Dave


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