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commit    50c63ebb05fc850010f571441b0349414e21c87f
Author:   Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date:     Tue Dec 02 19:10:51 2025 +0000
First released in: 14.21, 15.16, 16.12, 17.8, 18.2

    Fix amcheck's handling of incomplete root splits in B-tree
    
    When the root page is being split, it's normal that root page
    according to the metapage is not marked BTP_ROOT. Fix bogus error in
    amcheck about that case.
    
    Reviewed-by: Peter Geoghegan <pg@bowt.ie>
    Discussion: https://www.postgresql.org/message-id/abd65090-5336-42cc-b768-2bdd66738404@iki.fi
    Backpatch-through: 14


 contrib/amcheck/verify_nbtree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contrib/amcheck/verify_nbtree.c b/contrib/amcheck/verify_nbtree.c
index f11c43a0ed7..434c562c579 100644
--- a/contrib/amcheck/verify_nbtree.c
+++ b/contrib/amcheck/verify_nbtree.c
@@ -721,7 +721,7 @@ bt_check_level_from_leftmost(BtreeCheckState *state, BtreeLevel level)
 							 errmsg("block %u is not leftmost in index \"%s\"",
 									current, RelationGetRelationName(state->rel))));
 
-				if (level.istruerootlevel && !P_ISROOT(opaque))
+				if (level.istruerootlevel && (!P_ISROOT(opaque) && !P_INCOMPLETE_SPLIT(opaque)))
 					ereport(ERROR,
 							(errcode(ERRCODE_INDEX_CORRUPTED),
 							 errmsg("block %u is not true root in index \"%s\"",


[parent: 4061992ea83a]