From 188399232ac0248182679c53bf6ded65ad44ddad Mon Sep 17 00:00:00 2001
From: Wenbo <linwenbo1994@gmail.com>
Date: Mon, 24 Feb 2025 10:18:14 +0800
Subject: [PATCH] Fix corruption when entry->buffer changed to nonleaf while
 unlocked.

---
 src/rumget.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/rumget.c b/src/rumget.c
index ca5d83ee00..d4986b3af8 100644
--- a/src/rumget.c
+++ b/src/rumget.c
@@ -889,7 +889,14 @@ entryGetNextItem(RumState * rumstate, RumScanEntry entry, Snapshot snapshot)
 
 		LockBuffer(entry->buffer, RUM_SHARE);
 		page = BufferGetPage(entry->buffer);
-
+		if (!RumPageIsLeaf(page))
+		{
+			/*
+			 * Root page becomes non-leaf while we unlock it. just return.
+			 */
+			 LockBuffer(entry->buffer, RUM_UNLOCK);
+			 return;
+		}
 		PredicateLockPage(rumstate->index, BufferGetBlockNumber(entry->buffer), snapshot);
 
 		if (scanPage(rumstate, entry, &entry->curItem, false))