[Bug 91791] Symbolic threaded stack trace

[Brian Murray]

** Attachment added: "ThreadStacktrace.txt (retraced)"
   http://librarian.launchpad.net/6780814/%3Cfdopen%3E

** Tags removed: mt-needretrace

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[apport] firefox-bin crashed with SIGSEGV
https://launchpad.net/bugs/91791