inn "expire" process hangs (400 Expiring process <pid>)

Hi,

I got no responses in news.software.nntp, so I'll ask here. Here's the
original message for context:

Message-ID: <5dcbedb5-81e3-4ba1-a218-ac52c626cb05-aw@news.chmurka.net>

In short: anyone else experienced "expire" process that's run from
news.daily to hang sometimes? It doesn't do anything, just waits on a
socket, and it leaves the server throttled with "400 Expiring process
<pid>" message for hours.

inn 2.7.0