| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(at)vondra(dot)me> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Subject: | Re: Snapshot related assert failure on skink |
| Date: | 2025-03-17 12:18:37 |
| Message-ID: | CA+hUKGJ7VNSKuPPEpzjUS5Edrg+0dVLAMDprMZcou_MoX0BPnQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Mar 18, 2025 at 12:59 AM Tomas Vondra <tomas(at)vondra(dot)me> wrote:
> On 3/17/25 12:36, Tomas Vondra wrote:
> > I'm still fiddling with the script, trying to increase the probability
> > of the (apparent) race condition. On one machine (old Xeon) I can hit it
> > very easily/reliably, while on a different machine (new Ryzen) it's very
> > rare. I don't know if that's due to difference in speed of the CPU, or
> > fewer cores, ... I guess it changes the timing just enough.
> >
> > I've also tried running the stress test on PG17, and I'm yet to see a
> > single failure there. Not even on the xeon machine, that hits it
> > reliably on 18. So this seems to be a PG18-only issue.
> >
>
> And of course, the moment I sent this, I got a failure on 17 too. But
> it's seems much harder to hit (compared to 18).
Could there be a connection to this commit?
commit 119c23eb9819213551cbe7e7665c8b493c59ceee
Author: Nathan Bossart <nathan(at)postgresql(dot)org>
Date: Tue Sep 5 13:59:06 2023 -0700
Replace known_assigned_xids_lck with memory barriers.
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