From 3a39251f79d8731df77403321e50da67952adcf8 Mon Sep 17 00:00:00 2001
From: Matthias Seitz <matthias.seitz@outlook.de>
Date: Fri, 16 Jan 2026 23:32:23 +0100
Subject: [PATCH] fix: release mutex before dropping ancestors in wait_cloned
 (#21146)

---
 crates/chain-state/src/deferred_trie.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crates/chain-state/src/deferred_trie.rs b/crates/chain-state/src/deferred_trie.rs
index c2013f9ed6..efe23a2ded 100644
--- a/crates/chain-state/src/deferred_trie.rs
+++ b/crates/chain-state/src/deferred_trie.rs
@@ -287,6 +287,11 @@ impl DeferredTrieData {
                     &inputs.ancestors,
                 );
                 *state = DeferredState::Ready(computed.clone());
+
+                // Release lock before inputs (and its ancestors) drop to avoid holding it
+                // while their potential last Arc refs drop (which could trigger recursive locking)
+                drop(state);
+
                 computed
             }
         }