From 349f4b6374e86decdc0dcafad479d87f5cd2e959 Mon Sep 17 00:00:00 2001 From: Vineet Kumar <108144301+whyvineet@users.noreply.github.com> Date: Mon, 6 Jul 2026 00:32:58 +0530 Subject: [PATCH] gh-153141: Fix mutable default argument in _SharedMemoryTracker.__init__ (GH-153142) Fix default argument for segment_names in _SharedMemoryTracker constructor to not use a mutable list. (cherry picked from commit d733b104d53e96584a6881d2772df65ad82573a0) Co-authored-by: Vineet Kumar <108144301+whyvineet@users.noreply.github.com> --- Lib/multiprocessing/managers.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Lib/multiprocessing/managers.py b/Lib/multiprocessing/managers.py index 91bcf243e78e5b..11c6e21de90e69 100644 --- a/Lib/multiprocessing/managers.py +++ b/Lib/multiprocessing/managers.py @@ -1294,9 +1294,9 @@ class SyncManager(BaseManager): class _SharedMemoryTracker: "Manages one or more shared memory segments." - def __init__(self, name, segment_names=[]): + def __init__(self, name, segment_names=None): self.shared_memory_context_name = name - self.segment_names = segment_names + self.segment_names = [] if segment_names is None else segment_names def register_segment(self, segment_name): "Adds the supplied shared memory block name to tracker."