I had a long gdb session on this with the help of #gnome-hackers on irc.gnome.org.
This crash (and many like it) was caused by code in /usr/lib/x86_64-linux-gnu/gtk-3.0/modules/liboverlay-scrollbar.so. Instead of debugging it to the bitter end I apt-get removed overlay-scrollbar-gtk3 and the crashes are gone
I had a long gdb session on this with the help of #gnome-hackers on irc.gnome.org.
This crash (and many like it) was caused by code in /usr/lib/ x86_64- linux-gnu/ gtk-3.0/ modules/ liboverlay- scrollbar. so. Instead of debugging it to the bitter end I apt-get removed overlay- scrollbar- gtk3 and the crashes are gone