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