https://github.com/python/cpython/commit/c560df9658f1a24edea995fe6f9c84c55b37cfb3
commit: c560df9658f1a24edea995fe6f9c84c55b37cfb3
branch: main
author: Sergey Miryanov <sergey.mirya...@gmail.com>
committer: pablogsal <pablog...@gmail.com>
date: 2025-07-10T22:13:23+01:00
summary:
gh-136517: Print uncollectable objects if DEBUG_UNCOLLECTABLE mode was set
(#136518)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-07-10-23-23-50.gh-issue-136517._NHJyv.rst
M Lib/test/test_gc.py
M Python/gc.c
diff --git a/Lib/test/test_gc.py b/Lib/test/test_gc.py
index 85c43055d0dcec..96ebb23f73de9d 100644
--- a/Lib/test/test_gc.py
+++ b/Lib/test/test_gc.py
@@ -732,6 +732,9 @@ def run_command(code):
self.assertIn(b"ResourceWarning: gc: 2 uncollectable objects at "
b"shutdown; use", stderr)
self.assertNotIn(b"<X 'first'>", stderr)
+ one_line_re = b"gc: uncollectable <X 0x[0-9A-Fa-f]+>"
+ expected_re = one_line_re + b"\r?\n" + one_line_re
+ self.assertNotRegex(stderr, expected_re)
# With DEBUG_UNCOLLECTABLE, the garbage list gets printed
stderr = run_command(code % "gc.DEBUG_UNCOLLECTABLE")
self.assertIn(b"ResourceWarning: gc: 2 uncollectable objects at "
@@ -739,6 +742,8 @@ def run_command(code):
self.assertTrue(
(b"[<X 'first'>, <X 'second'>]" in stderr) or
(b"[<X 'second'>, <X 'first'>]" in stderr), stderr)
+ # we expect two lines with uncollectable objects
+ self.assertRegex(stderr, expected_re)
# With DEBUG_SAVEALL, no additional message should get printed
# (because gc.garbage also contains normally reclaimable cyclic
# references, and its elements get printed at runtime anyway).
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-07-10-23-23-50.gh-issue-136517._NHJyv.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-10-23-23-50.gh-issue-136517._NHJyv.rst
new file mode 100644
index 00000000000000..bf26c4eb0e4c74
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-10-23-23-50.gh-issue-136517._NHJyv.rst
@@ -0,0 +1,2 @@
+Fixed a typo that prevented printing of uncollectable objects when the
+:const:`gc.DEBUG_UNCOLLECTABLE` mode was set.
diff --git a/Python/gc.c b/Python/gc.c
index 88849a43680d2e..4160f68c27a3ef 100644
--- a/Python/gc.c
+++ b/Python/gc.c
@@ -1782,7 +1782,7 @@ gc_collect_region(PyThreadState *tstate,
Py_ssize_t n = 0;
for (gc = GC_NEXT(&finalizers); gc != &finalizers; gc = GC_NEXT(gc)) {
n++;
- if (gcstate->debug & _PyGC_DEBUG_COLLECTABLE)
+ if (gcstate->debug & _PyGC_DEBUG_UNCOLLECTABLE)
debug_cycle("uncollectable", FROM_GC(gc));
}
stats->uncollectable = n;
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