From f42a28f7182141ebd7646e23dc0f391b669ebed2 Mon Sep 17 00:00:00 2001
From: Sebastian Ullrich <sebasti@nullri.ch>
Date: Thu, 20 Mar 2025 08:04:50 +0100
Subject: [PATCH] chore: revert "perf: avoid taking mutex on task deactivation"
 (#7590)

Likely introduced segfaults.

Reverts leanprover/lean4#7572
---
 src/runtime/object.cpp | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/src/runtime/object.cpp b/src/runtime/object.cpp
index eb0e32bb3d..f03f0de521 100644
--- a/src/runtime/object.cpp
+++ b/src/runtime/object.cpp
@@ -926,12 +926,6 @@ public:
     }
 
     void deactivate_task(lean_task_object * t) {
-        if (object * v = t->m_value) {
-            lean_assert(t->m_imp == nullptr);
-            lean_dec(v);
-            free_task(t);
-            return;
-        }
         unique_lock<mutex> lock(m_mutex);
         if (object * v = t->m_value) {
             lean_assert(t->m_imp == nullptr);