Over on Bug #31412 I wrote:
> This branch fixes the crash and adds a regression test.
> It doesn't fix the underlying problem, which is that the request pipeline,
> vCard manager and connection call into each other without necessarily
> holding a reference; in particular, I'm suspicious about the one in
> However, fixing that will require some refactoring to add cyclic
> references and break them on disconnection, which I think is probably a
> job for 0.11.