Still hacking at this one. Built a clean system from current (snapshot 22jan13) which has ghostscript at 9.06p0, splix at 2.0.0p7 and cups at 1.6.1p5.
Now gs no longer segfaults, but gstoraster is still being obstinate. When I run it manually on the output from pdftops it shows some sensible debug information and tells me the command line with which it's invoking gs, but then hangs perpetually and there's a zombie gs state in the process table.
Digging into the gstoraster.c now but suspect that gs is terminating abnormally in some new and exciting way.
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