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Commit578a7fe

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Update TransactionXmin when MyProc->xmin is updated
GetSnapshotData() set TransactionXmin = MyProc->xmin, but whenSnapshotResetXmin() advanced MyProc->xmin, it did not advanceTransactionXmin correspondingly. That meant that TransactionXmin couldbe older than MyProc->xmin, and XIDs between than TransactionXmin andthe real MyProc->xmin could be vacuumed away. One known consequence isin pg_subtrans lookups: we might try to look up the status of an XIDthat was already truncated away.Back-patch to all supported versions.Reviewed-by: Andres FreundDiscussion:https://www.postgresql.org/message-id/d27a046d-a1e4-47d1-a95c-fbabe41debb4@iki.fi
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‎src/backend/utils/time/snapmgr.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -875,15 +875,15 @@ SnapshotResetXmin(void)
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if (pairingheap_is_empty(&RegisteredSnapshots))
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{
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MyProc->xmin=InvalidTransactionId;
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MyProc->xmin=TransactionXmin=InvalidTransactionId;
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return;
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}
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minSnapshot=pairingheap_container(SnapshotData,ph_node,
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pairingheap_first(&RegisteredSnapshots));
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if (TransactionIdPrecedes(MyProc->xmin,minSnapshot->xmin))
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MyProc->xmin=minSnapshot->xmin;
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MyProc->xmin=TransactionXmin=minSnapshot->xmin;
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}
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/*

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