postgres-github.git / summary / log / commit / refs

commit    648818ba3876fb3e43faffea729eccba969eefab
Author:   Etsuro Fujita <efujita@postgresql.org>
Date:     Tue May 05 09:55:00 2026 +0000

    postgres_fdw: Fix handling of abort-cleanup-failed connections.
    
    As connections that failed abort cleanup can't safely be further used,
    if a remote query tries to get such a connection, we reject it.
    Previously, this rejection involved dropping the connection if it was
    open, without accounting for the possibility of open cursors using it,
    causing a server crash when such an open cursor tried to use an
    already-dropped connection, as a cursor-handling function
    (create_cursor, fetch_more_data, or close_cursor) was called on a freed
    PGconn.  To fix, delay dropping failed connections until abort cleanup
    of the main transaction, to ensure open cursors using such a connection
    can safely refer to the PGconn for it.
    
    Oversight in commit 8bf58c0d9.
    
    Reported-by: Zhibai Song <songzhibai1234@gmail.com>
    Diagnosed-by: Zhibai Song <songzhibai1234@gmail.com>
    Author: Etsuro Fujita <etsuro.fujita@gmail.com>
    Reviewed-by: Michael Paquier <michael@paquier.xyz>
    Reviewed-by: Chao Li <li.evan.chao@gmail.com>
    Reviewed-by: Matheus Alcantara <matheusssilv97@gmail.com>
    Discussion: https://postgr.es/m/CAPmGK176y6JP017-Cn%2BhS9CEJx_6iVhRoYbAqzuLU4d8-XPPNg%40mail.gmail.com
    Backpatch-through: 14

[parent: d0ed9ad8b07d]