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Fix assertions with RI triggers in heap_update and heap_delete.

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If the tuple being updated is not visible to the crosscheck snapshot,
we return TM_Updated but the assertions would not hold in that case.
Move them to before the cross-check.

Fixes bug #17893. Backpatch to all supported versions.

Author: Alexander Lakhin
Backpatch-through: 12
Discussion: https://www.postgresql.org/message-id/17893-35847009eec517b5%40postgresql.org
This commit is contained in:
Heikki Linnakangas
2023-11-28 11:59:09 +02:00
parent fef92f9ba1
commit 2873fbfe0d
4 changed files with 64 additions and 20 deletions
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41
src/backend/access/heap/heapam.c
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@ -2856,13 +2856,7 @@ l1:
result = TM_Deleted;
}
if (crosscheck != InvalidSnapshot && result == TM_Ok)
{
/* Perform additional check for transaction-snapshot mode RI updates */
if (!HeapTupleSatisfiesVisibility(&tp, crosscheck, buffer))
result = TM_Updated;
}
/* sanity check the result HeapTupleSatisfiesUpdate() and the logic above */
if (result != TM_Ok)
{
Assert(result == TM_SelfModified ||
@ -2872,6 +2866,17 @@ l1:
Assert(!(tp.t_data->t_infomask & HEAP_XMAX_INVALID));
Assert(result != TM_Updated ||
!ItemPointerEquals(&tp.t_self, &tp.t_data->t_ctid));
}
if (crosscheck != InvalidSnapshot && result == TM_Ok)
{
/* Perform additional check for transaction-snapshot mode RI updates */
if (!HeapTupleSatisfiesVisibility(&tp, crosscheck, buffer))
result = TM_Updated;
}
if (result != TM_Ok)
{
tmfd->ctid = tp.t_data->t_ctid;
tmfd->xmax = HeapTupleHeaderGetUpdateXid(tp.t_data);
if (result == TM_SelfModified)
@ -3483,16 +3488,7 @@ l2:
result = TM_Deleted;
}
if (crosscheck != InvalidSnapshot && result == TM_Ok)
{
/* Perform additional check for transaction-snapshot mode RI updates */
if (!HeapTupleSatisfiesVisibility(&oldtup, crosscheck, buffer))
{
result = TM_Updated;
Assert(!ItemPointerEquals(&oldtup.t_self, &oldtup.t_data->t_ctid));
}
}
/* Sanity check the result HeapTupleSatisfiesUpdate() and the logic above */
if (result != TM_Ok)
{
Assert(result == TM_SelfModified ||
@ -3502,6 +3498,17 @@ l2:
Assert(!(oldtup.t_data->t_infomask & HEAP_XMAX_INVALID));
Assert(result != TM_Updated ||
!ItemPointerEquals(&oldtup.t_self, &oldtup.t_data->t_ctid));
}
if (crosscheck != InvalidSnapshot && result == TM_Ok)
{
/* Perform additional check for transaction-snapshot mode RI updates */
if (!HeapTupleSatisfiesVisibility(&oldtup, crosscheck, buffer))
result = TM_Updated;
}
if (result != TM_Ok)
{
tmfd->ctid = oldtup.t_data->t_ctid;
tmfd->xmax = HeapTupleHeaderGetUpdateXid(oldtup.t_data);
if (result == TM_SelfModified)