I don't know if this is exactly the same error, but I get something very
similar. A quite minimal testcase is included as an attachment. It can
be produced by pdftex from the following source:
\documentclass[a4paper,12pt]{article}
\usepackage{amssymb}
\begin{document}
$\approxeq$
\end{document}
I hope this helps further debugging this bug.
** Attachment added: "small testcase"
http://launchpadlibrarian.net/20677358/text.pdf
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Crash when opening pdf in Glib::ustring::append
https://bugs.launchpad.net/bugs/247287
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