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HoldPinnedPortals() did things in the wrong order: it must not mark a portal autoHeld until it's been successfully held. Otherwise, a failure while persisting the portal results in a server crash because we think the portal is in a good state when it's not. Also add a check that portal->status is READY before attempting to hold a pinned portal. We have such a check before the only other use of HoldPortal(), so it seems unwise not to check it here. Lastly, rethink the responsibility for where to call HoldPinnedPortals. The comment for it imagined that it was optional for any individual PL to call it or not, but that cannot be the case: if some outer level of procedure has a pinned portal, failing to persist it when an inner procedure commits is going to be trouble. Let's have SPI do it instead of the individual PLs. That's not a complete solution, since in theory a PL might not be using SPI to perform commit/rollback, but such a PL is going to have to be aware of lots of related requirements anyway. (This change doesn't cause an API break for any external PLs that might be calling HoldPinnedPortals per the old regime, because calling it twice during a commit or rollback sequence won't hurt.) Per bug #15703 from Julian Schauder. Back-patch to v11 where this code came in. Discussion: https://postgr.es/m/15703-c12c5bc0ea34ba26@postgresql.org |
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