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Robert Haas ec7ffb8096 amcheck: fix multiple problems with TOAST pointer validation ... First, don't perform database access while holding a buffer lock. When checking a heap, we can validate that TOAST pointers are sane by performing a scan on the TOAST index and looking up the chunks that correspond to each value ID that appears in a TOAST poiner in the main table. But, to do that while holding a buffer lock at least risks causing other backends to wait uninterruptibly, and probably can cause undetected and uninterruptible deadlocks. So, instead, make a list of checks to perform while holding the lock, and then perform the checks after releasing it. Second, adjust things so that we don't try to follow TOAST pointers for tuples that are already eligible to be pruned. The TOAST tuples become eligible for pruning at the same time that the main tuple does, so trying to check them may lead to spurious reports of corruption, as observed in the buildfarm. The necessary infrastructure to decide whether or not the tuple being checked is prunable was added by commit 3b6c1259f9, but it wasn't actually used for its intended purpose prior to this patch. Mark Dilger, adjusted by me to avoid a memory leak. Discussion: http://postgr.es/m/AC5479E4-6321-473D-AC92-5EC36299FBC2@enterprisedb.com		4 years ago
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expected	Display the time when the process started waiting for the lock, in pg_locks, take 2	5 years ago
sql	Disable vacuum page skipping in selected test cases.	5 years ago
t	Reinstate HEAP_XMAX_LOCK_ONLY|HEAP_KEYS_UPDATED as allowed	5 years ago
.gitignore	…
Makefile	Extend amcheck to check heap pages.	5 years ago
amcheck--1.0--1.1.sql	Add amcheck verification of heap relations belonging to btree indexes.	8 years ago
amcheck--1.0.sql	…
amcheck--1.1--1.2.sql	Allow amcheck to re-find tuples using new search.	7 years ago
amcheck--1.2--1.3.sql	Extend amcheck to check heap pages.	5 years ago
amcheck.control	Extend amcheck to check heap pages.	5 years ago
verify_heapam.c	amcheck: fix multiple problems with TOAST pointer validation	4 years ago
verify_nbtree.c	amcheck: Reduce debug message verbosity.	5 years ago