From 5bec6b806670805b9b2fc68629a2125f7986b139 Mon Sep 17 00:00:00 2001
From: Chanyoung Park <chaney.p@kakaoenterprise.com>
Date: Tue, 29 Jul 2025 08:34:24 +0000
Subject: [PATCH] crimson/.../fixed_kv_node: add assertion for pivot_idx
 validity

Signed-off-by: Chanyoung Park <chaney.p@kakaoenterprise.com>
---
 src/crimson/os/seastore/btree/fixed_kv_node.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/crimson/os/seastore/btree/fixed_kv_node.h b/src/crimson/os/seastore/btree/fixed_kv_node.h
index 2cd3b47a58fe..23d3b38f84be 100644
--- a/src/crimson/os/seastore/btree/fixed_kv_node.h
+++ b/src/crimson/os/seastore/btree/fixed_kv_node.h
@@ -349,6 +349,8 @@ struct FixedKVInternalNode
     auto replacement_right = c.cache.template alloc_new_non_data_extent<node_type_t>(
       c.trans, node_size, placement_hint_t::HOT, INIT_GENERATION);
 
+    // We should do full merge if pivot_idx == right.get_size().
+    ceph_assert(pivot_idx != right.get_size());
     this->balance_child_ptrs(
       c.trans,
       static_cast<node_type_t&>(*this),
-- 
2.47.3