Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wwIm2-001tSD-03 for pgsql-bugs@arkaria.postgresql.org; Tue, 18 Aug 2026 12:18:34 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.96) (envelope-from ) id 1wwIlz-00FY77-31 for pgsql-bugs@arkaria.postgresql.org; Tue, 18 Aug 2026 12:18:33 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wwGCv-00EzJX-0T for pgsql-bugs@lists.postgresql.org; Tue, 18 Aug 2026 09:34:10 +0000 Received: from mahout.postgresql.org ([2001:4800:3e1:1::227]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wwGCs-00000001N2u-1fc7 for pgsql-bugs@lists.postgresql.org; Tue, 18 Aug 2026 09:34:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=postgresql.org; s=20171124; h=Message-ID:Date:Reply-To:Cc:From:To:Subject: Content-Transfer-Encoding:MIME-Version:Content-Type:Sender:Content-ID: Content-Description:In-Reply-To:References; bh=mxAV/gWMxfT/+8dEBCq5PsesdwgDY2wjXrBjXYhVh08=; b=WbtwrqRSXOvQ28pNTOPErBC+QG uj7wEMQHbmoxkQbyM2TBlPA7Pfppr67fRUH/rHaJuZ5uSw5nJlGMcIlsvkpmmYmMU2F8q62QbaeNc 4o+t+39JMdrMvlEigA9PAgis1GpGR7FTE6+qKWYUogbXYQCiQ7KAHKO15P3UJRyKzTr3XaOpbnD3D sJwqex/6MmH155DoPln2zSLmvL3Ttcct+iv00J/KIAK5KUHAhOHliR7nDss5Z8CA31qNtsbunpU7Q JSnLrxiNbNdk1Z+AXZCEWNgyUg2pN8SfnaW6XL2bJQyqXiPbeewsdoUluuCfF7iHmX2k8HkqTmmQQ jDGK9CDw==; Received: from wrigleys.postgresql.org ([2a02:16a8:dc51::60]) by mahout.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wwGCq-003f4h-2X for pgsql-bugs@lists.postgresql.org; Tue, 18 Aug 2026 09:34:05 +0000 Received: from localhost ([127.0.0.1] helo=wrigleys.postgresql.org) by wrigleys.postgresql.org with esmtp (Exim 4.98.2) (envelope-from ) id 1wwGCp-00000009feH-2qQH for pgsql-bugs@lists.postgresql.org; Tue, 18 Aug 2026 09:34:03 +0000 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Subject: BUG #19627: 32,768 trigger arguments wrap `tgnargs` and are silently lost at runtime To: pgsql-bugs@lists.postgresql.org From: PG Bug reporting form Cc: v3rdant.xiang@gmail.com Reply-To: v3rdant.xiang@gmail.com, pgsql-bugs@lists.postgresql.org Date: Tue, 18 Aug 2026 09:33:12 +0000 Message-ID: <19627-5b72a57e332e2b3f@postgresql.org> X-Auto-Response-Suppress: All Auto-Submitted: auto-generated List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk The following bug has been logged on the website: Bug reference: 19627 Logged by: Xingwang Xiang Email address: v3rdant.xiang@gmail.com PostgreSQL version: 18.4 Operating system: Fedora Description: =20 ## Summary `CREATE TRIGGER` accepts 32,768 arguments, builds and stores the complete `tgargs` payload, but narrows the list length from `int` to `int16` without a limit check. The catalog stores `tgnargs =3D -32768`. Trigger loading interprets the non-positive count as no arguments. PL/pgSQL therefore sees a negative `TG_NARGS` and NULL `TG_ARGV`, and `pg_get_triggerdef()` silently omits every argument. The server remains alive; the issue is persistent catalog/runtime/schema-dump inconsistency. ## Affected version Reproduced twice on PostgreSQL 18.4 Debug and twice on optimized Release. The checked current source still assigns `list_length(stmt->args)` directly to an `int16`. ## Reproduction `reproduce.sql` is intentionally a single generated SQL file. It contains one `CREATE TRIGGER` statement with 32,768 one-byte arguments and needs no helper script at execution time: ```sh psql -X -v ON_ERROR_STOP=3D1 -f reproduce.sql ``` Run it as an ordinary owner of the test objects. No superuser access or system catalog update is needed. Expected observations: ```text tgnargs =3D -32768 octet_length(tgargs) =3D 65536 length(pg_get_triggerdef(...)) =3D 88 runtime nargs =3D -32768 runtime argv_len/first_arg/last_arg =3D NULL server_still_live =3D 1 ``` For comparison, 32,767 arguments yield `tgnargs=3D32767`, a 65,534-byte payload, and a populated `TG_ARGV` of cardinality 32,767. ## Real-world impact This is most plausible for generated DDL, migration tools, ORMs, or restored schemas rather than hand-written SQL. Once stored, the trigger definition no longer matches its catalog payload: - the trigger function silently runs without its configuration arguments; - schema deparse and dump omit all arguments, so backup/restore changes the object definition; - auditing tools that trust `tgnargs` see a different object from tools that inspect raw `tgargs`. 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