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Fix assorted core dumps and Assert failures that could occur during

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AbortTransaction or AbortSubTransaction, when trying to clean up after an
error that prevented (sub)transaction start from completing:
* access to TopTransactionResourceOwner that might not exist
* assert failure in AtEOXact_GUC, if AtStart_GUC not called yet
* assert failure or core dump in AfterTriggerEndSubXact, if
  AfterTriggerBeginSubXact not called yet

Per testing by injecting elog(ERROR) at successive steps in StartTransaction
and StartSubTransaction.  It's not clear whether all of these cases could
really occur in the field, but at least one of them is easily exposed by
simple stress testing, as per my accidental discovery yesterday.
This commit is contained in:
Tom Lane
2010-01-24 21:49:17 +00:00
parent 74f4be6c04
commit 875353b99f
3 changed files with 53 additions and 36 deletions
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11
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.534 2010/01/23 16:37:12 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.535 2010/01/24 21:49:17 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -3904,7 +3904,14 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
bool still_dirty;
int i;
Assert(nestLevel > 0 && nestLevel <= GUCNestLevel);
/*
* Note: it's possible to get here with GUCNestLevel == nestLevel-1 during
* abort, if there is a failure during transaction start before
* AtStart_GUC is called.
*/
Assert(nestLevel > 0 &&
(nestLevel <= GUCNestLevel ||
(nestLevel == GUCNestLevel + 1 && !isCommit)));
/* Quick exit if nothing's changed in this transaction */
if (!guc_dirty)