Re: Assertion failure on PG15 with modified test_shm_mq test

Hi,

On 2022-08-17 15:02:28 +0900, Michael Paquier wrote:
> On Wed, Aug 17, 2022 at 11:15:28AM +0530, Pavan Deolasee wrote:
> > I notice that pgstat_shutdown_hook() is registered as a before-shmem-exit
> > callback. The callback is responsible for detaching from the pgstat shared
> > memory segment. But looks like other parts of the system still expect it to
> > be available during later stages of proc exit.
> >
> > It's not clear to me if pgstat shutdown should happen later or code that
> > gets executed later in the cycle should not try to use pgstat. It's also
> > entirely possible that my usage of SharedFileSet is completely wrong. If
> > that's the case, please let me know the mistake in the usage.
>
> That's visibly an issue with shared memory and the stats. I have
> added an open item. Andres?

I don't think there's anything reasonably done about this for 15, as explained
upthread. We need a big redesign of the shutdown sequence at some point, but
...

Greetings,

Andres Freund