Christoph Berg <cb(at)df7cb(dot)de> writes:
> gcc5 is lurking in Debian experimental, and it's breaking initdb.
Yeah, I just heard the same about Red Hat as well:
https://bugzilla.redhat.com/show_bug.cgi?id=1190978
Not clear if it's an outright compiler bug or they've just found some
creative new way to make an optimization assumption we're violating.
Either way it seems clear that the find-a-page-with-free-space code is
getting into an infinite loop whereby it keeps extending the FSM till
it runs out of disk space.
There's a more detailed stack trace in the Red Hat report.
regards, tom lane