Re: postgres crash on concurrent update of inheritance partitioned table

Hi,

On 2020-01-28 17:29:59 -0500, Tom Lane wrote:
> Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> writes:
> > On Tue, Jan 28, 2020 at 05:17:14PM +0100, Oleksii Kliukin wrote:
> >> We have experienced a few crashes a day since upgrading to pg 12.1 last
> >> week, during the process of updating an inheritance-partitioned table by
> >> several concurrent sessions.
>
> > Yeah, I can reproduce it too. If I had to guess, I'd say it's another
> > bug due to
> > commit 3fb307bc4a76815f96fec28a0d1525ab3fbbcfb4
> > Author: Andres Freund <andres(at)anarazel(dot)de>
> > Date: Mon Sep 9 05:21:30 2019 -0700
> > Reorder EPQ work, to fix rowmark related bugs and improve efficiency.
> > which introduced relsubs_done et al, and perhaps did not get the life
> > cycle / resetting right. Not sure.
>
> Yup, that's it exactly. EvalPlanQualStart was expecting to reuse
> relsubs_rowmark and relsubs_done, but that storage will be recycled by
> EvalPlanQualEnd because it's in the query context of the recheckestate.
> AFAICS the re-use has no semantic value, so I just got rid of it.

Thanks!

Greetings,

Andres Freund