[Bug 91788] Symbolic threaded stack trace

[Apport retracing service]

** Attachment added: "ThreadStacktrace.txt (retraced)"
   http://librarian.launchpad.net/6771287/%3Cfdopen%3E

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[apport] gnome-cups-add crashed with SIGSEGV in __dynamic_cast()
https://launchpad.net/bugs/91788