Poppler (the PDF library) causes libfontconfig to segfault in the FcConfigSubstituteWithPat function when I load certain PDFs that use non-embedded fonts. I will attach a PDF that causes the problem. Poppler itself is probably also at fault (and I will file a downstream bug, and add it to the notes here), but libfontconfig shouldn't segfault even if there's bad input.
Downstream bug (in Poppler) reported as bug number 13322 (https://bugs.freedesktop.org/show_bug.cgi?id=13322)
New stack backtrace posted to the Poppler bug listed above.
Could you please attach the problematic PDF file?
https://bugs.freedesktop.org/show_bug.cgi?id=13322 and http://bugs.gentoo.org/show_bug.cgi?id=199827 contain PDFs that reproduce this problem. Note that the issue seems to be Gentoo-specific and has been fixed (or rather, worked around) there.
The Gentoo bug makes it seem like this was an xpdf issue.
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