[Bug 89383] Symbolic threaded stack trace

[Brian Murray]

** Attachment added: "ThreadStacktrace.txt (retraced)"
   http://librarian.launchpad.net/6837613/%3Cfdopen%3E

** Tags removed: need-amd64-retrace

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[apport] gdmgreeter crashed with SIGSEGV
https://launchpad.net/bugs/89383