https://github.com/python/cpython/commit/e2a7db717507a66b49bb796391530147b3acab93
commit: e2a7db717507a66b49bb796391530147b3acab93
branch: main
author: Shamil <[email protected]>
committer: Fidget-Spinner <[email protected]>
date: 2025-12-19T19:07:11Z
summary:
gh-142476: fix memory leak when creating JIT executors (GH-142492)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-12-13-01-11-03.gh-issue-142476.44Sp4N.rst
M Python/optimizer.c
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
new file mode 100644
index 00000000000000..eae1f3a1ce53b6
--- /dev/null
+++
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.
diff --git a/Python/optimizer.c b/Python/optimizer.c
index 1e905850e3de6b..16abced6edbeec 100644
--- a/Python/optimizer.c
+++ b/Python/optimizer.c
@@ -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
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