[Bug 91218] Symbolic threaded stack trace

[Apport retracing service]

** Attachment added: "ThreadStacktrace.txt (retraced)"
   http://librarian.launchpad.net/6898302/%3Cfdopen%3E

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[apport] gnome-cups-manager crashed with SIGSEGV in g_signal_emit_valist()
https://launchpad.net/bugs/91218