python · Fidget-Spinner · Dec 19, 2025 · Dec 9, 2025 · Dec 10, 2025 · Dec 10, 2025
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-12-13-01-11-03.gh-issue-142476.44Sp4N.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-12-13-01-11-03.gh-issue-142476.44Sp4N.rst
@@ -0,0 +1,2 @@
+Fix a memory leak in the experimental Tier 2 optimizer when creating
+executors. Patched by Shamil Abdulaev.
@@ -185,12 +185,17 @@ _PyOptimizer_Optimize(
    else {
        executor->vm_data.code = NULL;
    }
+    executor->vm_data.chain_depth = chain_depth;
+    assert(executor->vm_data.valid);
    _PyExitData *exit = _tstate->jit_tracer_state.initial_state.exit;
    if (exit != NULL) {
        exit->executor = executor;
    }
-    executor->vm_data.chain_depth = chain_depth;
-    assert(executor->vm_data.valid);
+    else {
+        // An executor inserted into the code object now has a strong reference
+        // to it from the code object. Thus, we don't need this reference anymore.
+        Py_DECREF(executor);
+    }
    interp->compiling = false;
    return 1;
 #else
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Fix a memory leak in the experimental Tier 2 optimizer when creating
		executors. Patched by Shamil Abdulaev.