@@ -0,0 +1,3 @@
+Fix a deadlock in the :term:`free threaded <free threading>` build when
+setting ``__abstractmethods__`` on a type while another thread holds the
+type lock.
@@ -1706,14 +1706,17 @@ type_set_abstractmethods(PyObject *tp, PyObject *value, void *Py_UNUSED(closure)
         return -1;
     }
 
+    pinned_mutexes_t pinned;
     BEGIN_TYPE_LOCK();
     _PyType_Modified_Unlocked(type);
+    type_lock_prevent_release(&pinned);
     types_stop_world();
     if (abstract)
         type_add_flags(type, Py_TPFLAGS_IS_ABSTRACT);
     else
         type_clear_flags(type, Py_TPFLAGS_IS_ABSTRACT);
     types_start_world();
+    type_lock_allow_release(&pinned);
     ASSERT_TYPE_LOCK_HELD();
     END_TYPE_LOCK();
Original file line number	Diff line number	Diff line change
@@ -0,0 +1,3 @@
	1	+ Fix a deadlock in the :term:`free threaded <free threading>` build when
	2	+ setting ``__abstractmethods__`` on a type while another thread holds the
	3	+ type lock.