So it is an issue of the CUPS Raster output device of Ghostscript, "cups".At Ghostscript upstream we have fixed several segfault bugs in the CUPS Raster output device (see upstream GIT log). Best is to upgrade to current Ghostscript 9.04 (best with cups/gdevcups.c replaced by the one from GIT master). If this is not possible, one should look into backporting some of these fixes.
Till