Comment 21 for bug 1538471

So, I'm not sure exactly what is causing this. While the crash is occurring in the python3-gi package, I suspect that it is innocent: this particular code path would be hit many times in programs using these bindings. It's behaviour is dependent on the gobject-introspection typelibs though, so I wonder if they've changed.

The libunity code base hasn't changed in any meaningful way for a long time, but there is a new version of Vala in Xenial (0.30.1, compared with 0.28.1 in Wily). It is possible that it did something to change the typelib.