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Commit2d7e591

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Properly re-initialize replication slot shared memory upon creation.
Slot creation did not clear all fields upon creation. After start thememory is zeroed, but when a physical replication slot was created inthe shared memory of a previously existing logical slot, catalog_xminwould not be cleared. That in turn would prevent vacuum from doing itsduties.To fix initialize all the fields. To make similar future bugs lesslikely, zero all of ReplicationSlotPersistentData, and re-order therest of the initialization to be in struct member order.Analysis: Andrew GierthReported-By: md@chewy.comAuthor: Michael PaquierDiscussion: <20160705173502.1398.70934@wrigleys.postgresql.org>Backpatch: 9.4, where replication slots were introduced
1 parent6657acc commit2d7e591

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‎src/backend/replication/slot.c

Lines changed: 14 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -272,12 +272,22 @@ ReplicationSlotCreate(const char *name, bool db_specific,
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*/
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Assert(!slot->in_use);
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Assert(slot->active_pid==0);
275-
slot->data.persistency=persistency;
276-
slot->data.xmin=InvalidTransactionId;
277-
slot->effective_xmin=InvalidTransactionId;
275+
276+
/* first initialize persistent data */
277+
memset(&slot->data,0,sizeof(ReplicationSlotPersistentData));
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StrNCpy(NameStr(slot->data.name),name,NAMEDATALEN);
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slot->data.database=db_specific ?MyDatabaseId :InvalidOid;
280-
slot->data.restart_lsn=InvalidXLogRecPtr;
280+
slot->data.persistency=persistency;
281+
282+
/* and then data only present in shared memory */
283+
slot->just_dirtied= false;
284+
slot->dirty= false;
285+
slot->effective_xmin=InvalidTransactionId;
286+
slot->effective_catalog_xmin=InvalidTransactionId;
287+
slot->candidate_catalog_xmin=InvalidTransactionId;
288+
slot->candidate_xmin_lsn=InvalidXLogRecPtr;
289+
slot->candidate_restart_valid=InvalidXLogRecPtr;
290+
slot->candidate_restart_lsn=InvalidXLogRecPtr;
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/*
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* Create the slot on disk. We haven't actually marked the slot allocated

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