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Date: Tue, 09 Jun 2026 12:10:42 -0300
Message-Id: <DJ4M4TOUHLM0.B38DAVN79FPH@gmail.com>
Cc: "Ayush Tiwari" <ayushtiwari.slg01@gmail.com>, <798604270@qq.com>,
 <pgsql-bugs@lists.postgresql.org>, "Etsuro Fujita"
 <etsuro.fujita@gmail.com>
Subject: Re: BUG #19484: Segmentation fault triggered by FDW
From: "Matheus Alcantara" <matheusssilv97@gmail.com>
To: "Rafia Sabih" <rafia.pghackers@gmail.com>
References: <19484-a3cb82c8cde3c8fa@postgresql.org>
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On Sat May 30, 2026 at 3:18 AM -03, Rafia Sabih wrote:
> A good catch. However there is one issue that remains here,
> in show_modifytable_info still is using the old index here fdw_private =
=3D
> (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 =3D force_generic_plan;
>  prepare fdw_part_upd2(int) as
>       update fdw_part_update2 set b =3D b + random()::int * 0 + 1 where a=
 =3D $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 appli=
es
> over the earlier patch (given by Ayush) in this thread.
>

Thanks for catching this, Rafia. The fix is correct =E2=80=94
show_modifytable_info() was indeed still reading from node->fdwPrivLists
using the post-pruning index j, which causes an out-of-bounds access
when partitions are pruned.

I think both patches should be squashed into a single one since they fix
the same underlying issue. I've done this locally and also ran pg_indent
over the result. Attached is the combined patch.

One minor naming observation: the new fdwPrivLists field in
ModifyTableState doesn't follow the mt_ prefix convention used by the
other re-indexed lists (mt_updateColnosLists, mt_mergeActionLists,
mt_mergeJoinConditions). Should we rename it to mt_fdwPrivLists for
consistency?

--
Matheus Alcantara
EDB: https://www.enterprisedb.com

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