BTW a similar variant has been fixed in PG 16 but does not fix the above case.
create role dropped_group; create role member; begin; grant dropped_group to member; OTHER SESSION: drop role dropped_group; BACK IN ORIGINAL SESSION: commit;
On Tue, 2025-02-11 at 15:32 +0530, Virender Singla wrote: > We have identified an issue causing upgrade failures. The following steps detail how to reproduce the issue: > > Create an orphan role entry > > /* Postgres version:: PostgreSQL 16.6 */ > /* The same can be reproduced in version 17 as well */ > > create role my_group; > create role dropped_member; > begin; > grant my_group to dropped_member; > OTHER SESSION: drop role dropped_member; > BACK IN ORIGINAL SESSION: > commit; > > Upgrade to Postgres v17 > > And the upgrade fails with an error : > > GRANT "my_group" TO "" WITH INHERIT TRUE GRANTED BY "postgres"; > ERROR: zero-length delimited identifier at or near """" > > The issue seems to be coming from pg_dumpall for building grants during pg_upgrade. > > https://github.com/postgres/postgres/blob/master/src/bin/pg_dump/pg_dumpall.c#L992
I agree that that is a bug.
I guess the GRANT statement should put a FOR KEY SHARE lock on the pg_authid row for "dropped_member", similar to what we do for foreign keys.
Yours, Laurenz Albe
--
*E-Mail Disclaimer* Der Inhalt dieser E-Mail ist ausschliesslich fuer den bezeichneten Adressaten bestimmt. Wenn Sie nicht der vorgesehene Adressat dieser E-Mail oder dessen Vertreter sein sollten, so beachten Sie bitte, dass jede Form der Kenntnisnahme, Veroeffentlichung, Vervielfaeltigung oder Weitergabe des Inhalts dieser E-Mail unzulaessig ist. Wir bitten Sie, sich in diesem Fall mit dem Absender der E-Mail in Verbindung zu setzen.
*CONFIDENTIALITY NOTICE & DISCLAIMER *This message and any attachment are confidential and may be privileged or otherwise protected from disclosure and solely for the use of the person(s) or entity to whom it is intended. If you have received this message in error and are not the intended recipient, please notify the sender immediately and delete this message and any attachment from your system. If you are not the intended recipient, be advised that any use of this message is prohibited and may be unlawful, and you must not copy this message or attachment or disclose the contents to any other person.
