I’m modifying the severity of the bug because sonata is no longer seriously broken.
Here is a quote from libgtk2.0-0 changelog which could help the maintainers of sonata: "gtk+2.0 (2.24.25-1) unstable; urgency=medium (…) * New upstream release - tolerates incorrect use of gtk_main() after initializing threads with gtk_init() but before taking the lock with gdk_threads_enter(), which has historically worked on GNU systems because glibc's mutexes are more permissive than the new implementation in GLib 2.42 (Closes: #758619, #763602, #763625, #763690, #763735, but the affected packages should still use Gdk's threading API properly) (…) -- Simon McVittie <[email protected]> Fri, 10 Oct 2014 18:33:05 +0100"
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