From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
---|---|
To: | Nicola Contu <nicola(dot)contu(at)gmail(dot)com> |
Cc: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, "pgsql-generallists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>, Alessandro Aste <Alessandro(dot)aste(at)gtt(dot)net> |
Subject: | Re: ERROR: too many dynamic shared memory segments |
Date: | 2020-01-30 22:41:05 |
Message-ID: | CA+hUKGKBJjpZ=+CL-3ncT1SJWZ_Wnm-J6nSXFcNhaDnrnWh-Xg@mail.gmail.com |
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On Wed, Jan 29, 2020 at 11:53 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> On Wed, Jan 29, 2020 at 10:37 PM Nicola Contu <nicola(dot)contu(at)gmail(dot)com> wrote:
> > This is the error on postgres log of the segmentation fault :
> >
> > 2020-01-21 14:20:29 GMT [] [42222]: [108-1] db=,user= LOG: server process (PID 2042) was terminated by signal 11: Segmentation fault
> > 2020-01-21 14:20:29 GMT [] [42222]: [109-1] db=,user= DETAIL: Failed process was running: select pid from pg_stat_activity where query ilike 'REFRESH MATERIALIZED VIEW CONCURRENTLY matview_vrs_request_stats'
> > 2020-01-21 14:20:29 GMT [] [42222]: [110-1] db=,user= LOG: terminating any other active server processes
> That gave me an idea... I hacked my copy of PostgreSQL to flip a coin
> to decide whether to pretend there are no slots free (see below), and
> I managed to make it crash in the regression tests when doing a
> parallel index build. It's late here now, but I'll look into that
> tomorrow. It's possible that the parallel index code needs to learn
> to cope with that.
Hi Nicola,
Without more information I can't know if I found the same bug you
experienced, but I think it's likely. I have committed a fix for
that, which will be available in the next release (mid-February).
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