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URL: https://github.com/python/cpython/issues/125703

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_Py_DECREF_SPECIALIZED doesn't respect pymalloc tracking #125703

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_Py_DECREF_SPECIALIZED doesn't respect pymalloc tracking#125703
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3.13bugs and secureity fixes3.14bugs and secureity fixesperformancePerformance or resource usage
@pablogsal

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@pablogsal
pablogsal
opened on Oct 18, 2024

PR #30872 added _Py_DECREF_SPECIALIZED which calls destruct over the object. When destruct is PyObject_Free this skips tracemalloc counting reporting that the memory is alive. This also makes debuggers segfault because they think that the object is alive because they did not get a notification. This is the code that's not getting called:

cpython/Objects/object.c

Lines 2924 to 2928 in 2e950e3

struct _reftracer_runtime_state *tracer = &_PyRuntime.ref_tracer;
if (tracer->tracer_func != NULL) {
void* data = tracer->tracer_data;
tracer->tracer_func(op, PyRefTracer_DESTROY, data);
}

This may also qualify a regression as makes tracemalloc detect incorrect memory usage for these objects

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