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GeezerVison is showing github.com — Reference leak in capi_call_instrumentation() for non-LINE monitoring events · Issue #150379 · python/cpython

Reference leak in capi_call_instrumentation() for non-LINE monitoring events #150379

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Reference leak in capi_call_instrumentation() for non-LINE monitoring events#150379
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type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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@lpyu001
lpyu001
opened on May 25, 2026
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Bug report

Bug description:

#instrumentation.c: PyLong leaked per C API monitoring call

capi_call_instrumentation (line 2609) creates offset_obj = PyLong_FromLong(offset) stored in args[2] but never calls Py_DECREF. Affects ~16 _PyMonitoring_Fire*Event C API functions. Unbounded memory growth in long-running apps using C monitoring.

This is a sub-issue of #146102 with gist details

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Linked PRs

  • gh-150379:Fix PyLong ref leak in C API monitoring events #150381

Activity

  1. lpyu001
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on May 25, 2026
  2. kumaraditya303
    added a commit that references this issue on May 25, 2026

    gh-150379: fix ref leak in C API monitoring events (#150381)

    71cf313
  3. kumaraditya303
    closed this as completedon May 25, 2026
  4. aisk
    added a parent issue on Jul 13, 2026
    • Umbrella issue: bugs found using cpython-review-toolkit #146102
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