not the same issue, the lock is fixed by
http://cvs.gnome.org/viewcvs/gtk%2B/gtk/gtkfilesystemunix.c?r1=1.79&r2=1.80
** Changed in: gtk+2.0 (Ubuntu)
Status: Confirmed => Fix Committed
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Current gtk+ has a critical bug crashing apps, please upgrade gtk+.
https://launchpad.net/bugs/63107