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Print uncollectable objects if DEBUG_UNCOLLECTABLE mode was set #136517

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Print uncollectable objects if DEBUG_UNCOLLECTABLE mode was set#136517
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error
@sergey-miryanov

Description

@sergey-miryanov
sergey-miryanov
opened on Jul 10, 2025

Bug report

Bug description:

There was a typo, and uncollectable objects printed only if DEBUG_COLLECTABLE mode is set.
Affected main and 3.14 (183b020)

cpython/Python/gc.c

Lines 1783 to 1787 in 59acdba

for (gc = GC_NEXT(&finalizers); gc != &finalizers; gc = GC_NEXT(gc)) {
n++;
if (gcstate->debug & _PyGC_DEBUG_COLLECTABLE)
debug_cycle("uncollectable", FROM_GC(gc));
}

CPython versions tested on:

CPython main branch

Operating systems tested on:

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    interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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