I wrote:
> I'd not looked closely enough at the previous failure, because
> now that I have, this is well out in WTFF territory: how can
> reltuples be greater than zero when relpages is zero? This can't
> be a state that autovacuum would have left behind, unless it's
> really seriously broken. I think we need to be looking for
> explanations like "memory stomp" or "compiler bug".
... in connection with which, I can't help noticing that parula
is using a very old compiler:
configure: using compiler=gcc (GCC) 7.3.1 20180712 (Red Hat 7.3.1-17)
From some quick checking around, that would have to be near the
beginning of aarch64 support in RHEL (Fedora hadn't promoted aarch64
to a primary architecture until earlier that same year). It's not
exactly hard to believe that there were some lingering compiler bugs.
I wonder why parula is using that when its underlying system seems
markedly newer (the kernel at least has a recent build date).
regards, tom lane