Thread: pgsql: At update of non-LP_NORMAL TID, fail instead of corrupting page
At update of non-LP_NORMAL TID, fail instead of corrupting page header. 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 Branch ------ REL_16_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/9311fcb8648075782f59d534010352264bf8dc54 Modified Files -------------- src/backend/access/heap/heapam.c | 47 +++++++++++++++++++++++++++++++++++++++- src/include/access/tableam.h | 3 ++- 2 files changed, 48 insertions(+), 2 deletions(-)