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In-Reply-To: <3cc93f9.1ab.19d74a26acf.Coremail.wxp_728@163.com>
From: Xuneng Zhou <xunengzhou@gmail.com>
Date: Fri, 10 Apr 2026 15:36:04 +0800
Message-ID: 
 <CABPTF7UaXNab-LNyR5jDEu=FpGG_vZSOYqwxzyKrw+60Y5sCJw@mail.gmail.com>
Subject: Re: Re: Bug: WAIT FOR LSN crashes with assertion failure inside
 PL/pgSQL DO blocks and procedures
To: "wang.xiao.peng" <wxp_728@163.com>
Cc: Alexander Korotkov <aekorotkov@gmail.com>,
	SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
	PostgreSQL-development <pgsql-hackers@postgresql.org>
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On Fri, Apr 10, 2026 at 7:45=E2=80=AFAM wang.xiao.peng <wxp_728@163.com> wr=
ote:
>
>
>
>
>
>
>
>
> At 2026-04-09 20:28:16, "Alexander Korotkov" <aekorotkov@gmail.com> wrote=
:
> >On Thu, Apr 9, 2026 at 10:27=E2=80=AFAM SATYANARAYANA NARLAPURAM
> ><satyanarlapuram@gmail.com> wrote:
> >> On Wed, Apr 8, 2026 at 11:00=E2=80=AFPM Alexander Korotkov <aekorotkov=
@gmail.com> wrote:
> >>> On Thu, Apr 9, 2026 at 5:03=E2=80=AFAM SATYANARAYANA NARLAPURAM
> >>> <satyanarlapuram@gmail.com> wrote:
> >>> > An assertion failure (server crash in assert-enabled builds) occurs=
 when WAIT FOR LSN ... INTO is used inside PL/pgSQL DO blocks or within voi=
d procedures.
> >>> >
> >>> > Repro:
> >>> >
> >>> > -- Run this on a standby
> >>> >
> >>> > CREATE PROCEDURE test_wait()
> >>> >   LANGUAGE plpgsql AS $$
> >>> >   DECLARE
> >>> >     result text;
> >>> >   BEGIN
> >>> >     WAIT FOR LSN '0/1234' INTO result;
> >>> >     RAISE NOTICE '%', result;
> >>> >   END;
> >>> >   $$;
> >>> >   CALL test_wait();
> >>> >
> >>> >
> >>> > The WAIT FOR itself succeeds, but the very next PL/pgSQL statement =
that requires a snapshot crashes the backend with:
> >>> >
> >>> >   TRAP: failed Assert("portal->portalSnapshot =3D=3D NULL"),
> >>> >   File: "pquery.c", Line: 1776
> >>> >
> >>> > Attached patches for both the test case and a potential fix. Please=
 review.
> >>>
> >>> Thank you for reporting.  But I doubt the fix is correct.  Even that
> >>> this particular might work OK, I don't think it's safe to release
> >>> snapshots belonging to functions/procedures: it might affect them.  I
> >>> tend to think we must forbid wrapping WAIT FOR LSN with
> >>> functions/procedures.  I'll explore more on this today.
> >>
> >>
> >> Agreed, attached a v2 patch with your suggestion on preventing it runn=
ing
> >> from procedures.
> >
> >Thank you.  I've slightly revised your patch.  I'm going to push it if
> >no objections.
> >
> >------
> >Regards,
> >Alexander Korotkov
> >Supabase
>
> Hi,
> This patch looks good to me overall. I spotted a typo in the commit messa=
ge:
>
> "it could pass this check causing an error elsewhere.  This commit implme=
nts"
>
> implments -> implements, missing an "e".
>

I=E2=80=99ve revised the patch. Moving the non=E2=80=93top-level rejection =
to the
beginning of the function may help avoid unnecessary parsing and
validation work, although it could make the reasoning slightly less
localized.

Since this is user-facing, should we explicitly document this
constraint to make the behavior less surprising? The rejection applies
not only to wrapping the command in a procedure or function, but also
within a DO block.

It might also be worth adding a regression test and refining the error
message accordingly. With this new constraint, some existing comments
were outdated and have been updated as well.

--
Best,
Xuneng

--000000000000390ad6064f16308e
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