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At update of non-LP_NORMAL TID, fail instead of corrupting page header.

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The right mix of DDL and VACUUM could corrupt a catalog page header such
that PageIsVerified() durably fails, requiring a restore from backup.
This affects only catalogs that both have a syscache and have DDL code
that uses syscache tuples to construct updates.  One of the test
permutations shows a variant not yet fixed.

This makes !TransactionIdIsValid(TM_FailureData.xmax) possible with
TM_Deleted.  I think core and PGXN are indifferent to that.

Per bug #17821 from Alexander Lakhin.  Back-patch to v13 (all supported
versions).  The test case is v17+, since it uses INJECTION_POINT.

Discussion: https://postgr.es/m/17821-dd8c334263399284@postgresql.org
This commit is contained in:
Noah Misch
2025-01-25 11:28:14 -08:00
parent 81772a495e
commit d28cd3e7b2
10 changed files with 490 additions and 5 deletions
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3
src/backend/utils/cache/inval.c vendored
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@@ -123,6 +123,7 @@
#include "storage/sinval.h"
#include "storage/smgr.h"
#include "utils/catcache.h"
#include "utils/injection_point.h"
#include "utils/inval.h"
#include "utils/memdebug.h"
#include "utils/memutils.h"
@@ -1134,6 +1135,8 @@ AtEOXact_Inval(bool isCommit)
/* Must be at top of stack */
Assert(transInvalInfo->my_level == 1 && transInvalInfo->parent == NULL);
INJECTION_POINT("AtEOXact_Inval-with-transInvalInfo");
if (isCommit)
{
/*