I've been researching today what appears to be the same issue.
I'm using OpenBSD 5.2 release, generic bsd.mp, no patches - plus unmodified release versions of cups, ghostscript-a4-gtk, splix and gstoraster.
Everything was very enigmatic until I decided to run the individual parts of the filter pipeline manually (annoyingly the forum rules mean i cant post urls yet) as per aitch tee tee pee dot fedoraproject.org/wiki/How_to_debug_printing_problems#Running_filters_by_ hand. You can work out the filter pipeline by studying /usr/local/share/cups/mime/mime.conv as per aitch tee tee pee ess discussions.apple.com/thread/2611692?start=0&tstart=0 and you can work out the rasteriser by studying the PPD file for your printer in /etc/cups/ppd.
For a plain text file the pipeline is texttops | pstops | pstoqpdl.
The first two filters run fine (you can view the intermediate results with gs - remember to set the paper size: -sPAPERSIZE=a4 if that's what you're using).
But calling pstoqpdl causes ghostscript to segfault and core dump. Even more interestingly, so does pstoraster (aliased to gstoraster on the release build) - that's significant because gstoraster is nothing to do with splix.
If you google "gstoraster segfault" you will find many links that make it clear this is a problem with the cups raster driver in older versus of ghostscript.
I note that current has an updated version of gs, but I'm not ready to try that yet.
Good luck MC
PS: the correct way to start and stop cups on a modern OBSD system is to do sudo /etc/rc.d/cupsd start (or stop). That will automatically take are of the ulpt ownership things that need to be done :-)
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