Stacktrace was interesting, while looking up an icon, there might be a
theme-changed signal and therefore our callback is called. However
before we lookup an icon, we unreference the last icon but don't set it
to NULL, and hence the callback accesses and invalid pointer.

** Changed in: unity
       Status: Triaged => Fix Committed

** Changed in: unity (Ubuntu Natty)
       Status: Triaged => Fix Committed

** Changed in: unity (Ubuntu Natty)
       Status: Fix Committed => In Progress

** Changed in: unity (Ubuntu Natty)
   Importance: Medium => Critical

** Changed in: unity
   Importance: Medium => Critical

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https://bugs.launchpad.net/bugs/741652

Title:
  compiz crashed with SIGSEGV in
  SimpleLauncherIcon::OnIconThemeChanged()

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