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Etsuro Fujita 648818ba38 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		3 days ago
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postgres_fdw.sql	postgres_fdw: Fix handling of abort-cleanup-failed connections.	3 days ago
query_cancel.sql	postgres_fdw: re-issue cancel requests a few times if necessary.	1 year ago