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In-Reply-To: <2a199ba7-1d18-438a-847e-5241b7dac514@gmail.com>
From: Masahiko Sawada <sawada.mshk@gmail.com>
Date: Thu, 30 Apr 2026 15:08:54 -0700
Message-ID: 
 <CAD21AoAiPyHqCT2LrBJoMT4PYmr=QaKzzdLL9EM=B-4whV47xA@mail.gmail.com>
Subject: Re: Startup process deadlock: WaitForProcSignalBarriers vs aux
 process
To: Alexander Lakhin <exclusion@gmail.com>
Cc: Andres Freund <andres@anarazel.de>,
	Matthias van de Meent <boekewurm+postgres@gmail.com>,
 Thomas Munro <thomas.munro@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 Heikki Linnakangas <hlinnaka@iki.fi>
Content-Type: multipart/mixed; boundary="000000000000168d260650b4b844"
Archived-At: 
 <https://www.postgresql.org/message-id/CAD21AoAiPyHqCT2LrBJoMT4PYmr%3DQaKzzdLL9EM%3DB-4whV47xA%40mail.gmail.com>
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On Wed, Apr 29, 2026 at 11:00=E2=80=AFAM Alexander Lakhin <exclusion@gmail.=
com> wrote:
>
> Dear Sawada-san,
>
> 28.04.2026 22:27, Masahiko Sawada wrote:
> > On Mon, Apr 27, 2026 at 11:00=E2=80=AFAM Alexander Lakhin <exclusion@gm=
ail.com> wrote:
> >> I've been puzzled by a buildfarm failure [1] with such symptoms for a =
while
> >> and even reproduced it locally once, but couldn't gather more informat=
ion
> >> that time. But now that you have described the scenario, I can easily
> >> reproduce the same test failure with:
> >> --- a/src/backend/storage/ipc/procsignal.c
> >> +++ b/src/backend/storage/ipc/procsignal.c
> >> @@ -206,6 +206,7 @@ ProcSignalInit(const uint8 *cancel_key, int cancel=
_key_len)
> >>          if (cancel_key_len > 0)
> >>                  memcpy(slot->pss_cancel_key, cancel_key, cancel_key_l=
en);
> >>          slot->pss_cancel_key_len =3D cancel_key_len;
> >> +pg_usleep(10000);
> >>          pg_atomic_write_u32(&slot->pss_pid, MyProcPid);
> > Thank you for testing this.
> >
> > I've attached a patch to address the issue. I haven't verified it
> > across all versions yet, but I suspect it exists in the stable
> > branches as well...
>
> Thank you for the fix! It works for me too.
>
> I was wondering why is that failure the only one of this kind on buildfar=
m
> (in last two years, at least), so I've tried to reproduce it on
> REL_18_STABLE... and failed.
>
> Then I've bisected it on the master branch and found (your) commit that
> introduced this behavior: 67c20979c from 2025-12-23.
>

I've confirmed that this race condition issue is present from v15 to
the master. In v14, we have the procsignal barrier code but don't use
it anywhere. In v18 or older, it could happen when executing DROP
DATABASE, DROP TABLESPACE etc, whereas in the master, it could happen
in more cases as we're using procsignal barrier more places. In any
case, if a process emits a signal barrier when another process is
between the initialization of slot->pss_barrierGeneration and
slot->pss_pid initialization, the subsequent
WaitForProcSignalBarrier() ends up waiting for that process forever.
So I think the patch should be backpatched to v15. Please review these
patches.

FYI I found that we had a similar report[1]  last year, I'm not sure
it hit the exact same issue, though.

Regards,

[1] https://www.postgresql.org/message-id/CAGQGyDTaVkG3DbTEbtyxZLM48jMZR2Bc=
vTeYBsWLV5HvwSb+2Q@mail.gmail.com

--
Masahiko Sawada
Amazon Web Services: https://aws.amazon.com

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