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Commitec253de

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Fix corruption of 2PC recovery with subxacts
Reading 2PC state files during recovery was borked, causing corruptions duringrecovery. Effect limited to servers with 2PC, subtransactions andrecovery/replication.Stas Kelvich, reviewed by Michael Paquier and Pavan Deolasee
1 parentf664724 commitec253de

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+6
-4
lines changed

1 file changed

+6
-4
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‎src/backend/access/transam/twophase.c‎

Lines changed: 6 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1758,8 +1758,9 @@ PrescanPreparedTransactions(TransactionId **xids_p, int *nxids_p)
17581758
* need to hold a lock while examining it. We still acquire the
17591759
* lock to modify it, though.
17601760
*/
1761-
subxids= (TransactionId*)
1762-
(buf+MAXALIGN(sizeof(TwoPhaseFileHeader)));
1761+
subxids= (TransactionId*) (buf+
1762+
MAXALIGN(sizeof(TwoPhaseFileHeader))+
1763+
MAXALIGN(hdr->gidlen));
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for (i=0;i<hdr->nsubxacts;i++)
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{
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TransactionIdsubxid=subxids[i];
@@ -1877,8 +1878,9 @@ StandbyRecoverPreparedTransactions(bool overwriteOK)
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* Examine subtransaction XIDs ... they should all follow main
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* XID.
18791880
*/
1880-
subxids= (TransactionId*)
1881-
(buf+MAXALIGN(sizeof(TwoPhaseFileHeader)));
1881+
subxids= (TransactionId*) (buf+
1882+
MAXALIGN(sizeof(TwoPhaseFileHeader))+
1883+
MAXALIGN(hdr->gidlen));
18821884
for (i=0;i<hdr->nsubxacts;i++)
18831885
{
18841886
TransactionIdsubxid=subxids[i];

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