Thanks for your bug. That looks like an ubuntulooks issue, reassigning.
Maybe you could get a backtrace with "thread apply all bt' next time it
happens to you and maybe with debug version of ubuntulooks and libcairo
installed?
** Changed in: gnome-panel (Ubuntu)
Sourcepackagename: gnome-panel => ubuntulooks
Status: Unconfirmed => Needs Info
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gnome-panel dead-locked after apt-get upgrade
https://launchpad.net/bugs/64120
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