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 <DIPI7GSQFV1C.20OALZACS6KLI@gmail.com>
In-Reply-To: <DIPI7GSQFV1C.20OALZACS6KLI@gmail.com>
From: Rafia Sabih <rafia.pghackers@gmail.com>
Date: Sat, 30 May 2026 08:18:13 +0200
Message-ID: 
 <CA+FpmFc10Dtnr9dr=xqK2cNYQ4-1VuOyvOT7-eqXPmiQJoyPew@mail.gmail.com>
Subject: Re: BUG #19484: Segmentation fault triggered by FDW
To: Matheus Alcantara <matheusssilv97@gmail.com>
Cc: Ayush Tiwari <ayushtiwari.slg01@gmail.com>, 798604270@qq.com,
	pgsql-bugs@lists.postgresql.org, Etsuro Fujita <etsuro.fujita@gmail.com>
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On Fri, 22 May 2026 at 22:56, Matheus Alcantara <matheusssilv97@gmail.com>
wrote:

> On Wed May 20, 2026 at 9:37 AM -03, Ayush Tiwari wrote:
> > I reproduced the crash on master.  The plan EXPLAIN under
> > force_generic_plan shows runtime pruning is in effect:
> >
> >   Update on pt
> >     Foreign Update on pt_p2 pt_2
> >     ->  Append
> >           Subplans Removed: 1
> >           ->  Foreign Update on pt_p2 pt_2
> >
> > The SEGV happens inside postgresBeginForeignModify() because
> > ExecInitModifyTable() builds re-indexed "kept" copies of several
> > parallel per-result-relation lists after dropping pruned relations -
> > withCheckOptionLists, returningLists, updateColnosLists,
> > mergeActionLists and mergeJoinConditions, however two members were
> > missed:
> >
> >   - node->fdwPrivLists, read with list_nth(node->fdwPrivLists, i) when
> >     BeginForeignModify() is called, and
> >   - node->fdwDirectModifyPlans, checked with bms_is_member(i, ...) when
> >     setting ri_usesFdwDirectModify.
> >
> > Both were still indexed against the original (pre-pruning) positions
> > while the surrounding loop's "i" is now the kept position.  When the
> > foreign partition's kept-index no longer matched its original index,
> > BeginForeignModify() got the wrong fdw_private and crashed.
> >
> > Attached patch builds re-indexed kept copies for these two arrays in
> > the same loop as the other parallel lists, and uses them at the two
> > call sites.
> >
>
A good catch. However there is one issue that remains here,
in show_modifytable_info still is using the old index here fdw_private =
(List *) list_nth(node->fdwPrivLists, j) i.e. the one before pruning.
In fact I found a scenario where it is causing crash, try this

create table fdw_part_update2 (a int not null, b int) partition by list (a);
create table fdw_part_update2_p1 partition of fdw_part_update2 for values
in (1);
create table fdw_part_update2_remote (a int not null, b int);
create foreign table fdw_part_update2_p2 partition of fdw_part_update2
    for values in (2)
    server loopback options (table_name 'fdw_part_update2_remote');
insert into fdw_part_update2_p1 values (1, 10);
insert into fdw_part_update2_remote values (2, 20);
set plan_cache_mode = force_generic_plan;
 prepare fdw_part_upd2(int) as
      update fdw_part_update2 set b = b + random()::int * 0 + 1 where a = $1
      returning tableoid::regclass, a, b;
execute fdw_part_upd2(2);
explain (analyze, verbose, costs off, timing off, summary off)
    execute fdw_part_upd2(2);

Please find the attached file for the patch to fix this. This patch applies
over the earlier patch (given by Ayush) in this thread.

>
> Hi, thanks for the patch. This issue started on version 18 by commit
> cbc127917e0.
>
> The patch fixes the issue and it make sense to me. One a minor comment
> is that I think pg_indent is needed on nodeModifyTable.c
>
> --
> Matheus Alcantara
> EDB: https://www.enterprisedb.com
>
>
>

-- 
Regards,
Rafia Sabih
CYBERTEC PostgreSQL International GmbH

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote g=
mail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, 22 May =
2026 at 22:56, Matheus Alcantara &lt;<a href=3D"mailto:matheusssilv97@gmail=
.com">matheusssilv97@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex">On Wed May 20, 2026 at 9:37 AM -03, Ayush Tiw=
ari wrote:<br>
&gt; I reproduced the crash on master.=C2=A0 The plan EXPLAIN under<br>
&gt; force_generic_plan shows runtime pruning is in effect:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0Update on pt<br>
&gt;=C2=A0 =C2=A0 =C2=A0Foreign Update on pt_p2 pt_2<br>
&gt;=C2=A0 =C2=A0 =C2=A0-&gt;=C2=A0 Append<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Subplans Removed: 1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-&gt;=C2=A0 Foreign Update on =
pt_p2 pt_2<br>
&gt;<br>
&gt; The SEGV happens inside postgresBeginForeignModify() because<br>
&gt; ExecInitModifyTable() builds re-indexed &quot;kept&quot; copies of sev=
eral<br>
&gt; parallel per-result-relation lists after dropping pruned relations -<b=
r>
&gt; withCheckOptionLists, returningLists, updateColnosLists,<br>
&gt; mergeActionLists and mergeJoinConditions, however two members were<br>
&gt; missed:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0- node-&gt;fdwPrivLists, read with list_nth(node-&gt;fdwPr=
ivLists, i) when<br>
&gt;=C2=A0 =C2=A0 =C2=A0BeginForeignModify() is called, and<br>
&gt;=C2=A0 =C2=A0- node-&gt;fdwDirectModifyPlans, checked with bms_is_membe=
r(i, ...) when<br>
&gt;=C2=A0 =C2=A0 =C2=A0setting ri_usesFdwDirectModify.<br>
&gt;<br>
&gt; Both were still indexed against the original (pre-pruning) positions<b=
r>
&gt; while the surrounding loop&#39;s &quot;i&quot; is now the kept positio=
n.=C2=A0 When the<br>
&gt; foreign partition&#39;s kept-index no longer matched its original inde=
x,<br>
&gt; BeginForeignModify() got the wrong fdw_private and crashed.<br>
&gt;<br>
&gt; Attached patch builds re-indexed kept copies for these two arrays in<b=
r>
&gt; the same loop as the other parallel lists, and uses them at the two<br=
>
&gt; call sites.<br>
&gt;<br></blockquote><div>A good catch. However there is one issue that rem=
ains here, in=C2=A0show_modifytable_info still is using the old index here =
fdw_private =3D (List *) list_nth(node-&gt;fdwPrivLists, j) i.e. the one be=
fore pruning.</div><div>In fact I found a scenario where it is causing cras=
h, try this</div><div><br></div><div>create table fdw_part_update2 (a int n=
ot null, b int) partition by list (a);<br>create table fdw_part_update2_p1 =
partition of fdw_part_update2 for values in (1);<br>create table fdw_part_u=
pdate2_remote (a int not null, b int);<br>create foreign table fdw_part_upd=
ate2_p2 partition of fdw_part_update2<br>=C2=A0 =C2=A0 for values in (2)<br=
>=C2=A0 =C2=A0 server loopback options (table_name &#39;fdw_part_update2_re=
mote&#39;);<br>insert into fdw_part_update2_p1 values (1, 10);<br>insert in=
to fdw_part_update2_remote values (2, 20);<br>set plan_cache_mode =3D force=
_generic_plan;<br>=C2=A0prepare fdw_part_upd2(int) as<br>=C2=A0 =C2=A0 =C2=
=A0 update fdw_part_update2 set b =3D b + random()::int * 0 + 1 where a =3D=
 $1<br>=C2=A0 =C2=A0 =C2=A0 returning tableoid::regclass, a, b; <br>execute=
 fdw_part_upd2(2);<br>explain (analyze, verbose, costs off, timing off, sum=
mary off)<br>=C2=A0 =C2=A0 execute fdw_part_upd2(2);</div><div><br></div><d=
iv>Please find the attached file for the patch to fix this. This patch appl=
ies over the earlier patch (given by Ayush) in this thread.</div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex">
<br>
Hi, thanks for the patch. This issue started on version 18 by commit<br>
cbc127917e0.<br>
<br>
The patch fixes the issue and it make sense to me. One a minor comment<br>
is that I think pg_indent is needed on nodeModifyTable.c<br>
<br>
--<br>
Matheus Alcantara<br>
EDB: <a href=3D"https://www.enterprisedb.com" rel=3D"noreferrer" target=3D"=
_blank">https://www.enterprisedb.com</a><br>
<br>
<br>
</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"gmail_signature_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_s=
ignature"><div dir=3D"ltr">Regards,<br>Rafia Sabih<div>CYBERTEC PostgreSQL =
International GmbH<br></div></div></div></div>

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