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gh-124470: Fix crash when reading from object instance dictionary while replacing it (#122489)

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Delay free a dictionary when replacing it
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Dino Viehland 2024-11-21 08:41:19 -08:00 • committed by GitHub
parent 3926842117
commit bf542f8bb9
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7 changed files with 294 additions and 90 deletions
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16
Include/internal/pycore_pymem.h
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@ -120,11 +120,25 @@ extern int _PyMem_DebugEnabled(void);
extern void _PyMem_FreeDelayed(void *ptr);
// Enqueue an object to be freed possibly after some delay
extern void _PyObject_FreeDelayed(void *ptr);
#ifdef Py_GIL_DISABLED
extern void _PyObject_XDecRefDelayed(PyObject *obj);
#else
static inline void _PyObject_XDecRefDelayed(PyObject *obj)
{
Py_XDECREF(obj);
}
#endif
// Periodically process delayed free requests.
extern void _PyMem_ProcessDelayed(PyThreadState *tstate);
// Periodically process delayed free requests when the world is stopped.
// Notify of any objects whic should be freeed.
typedef void (*delayed_dealloc_cb)(PyObject *, void *);
extern void _PyMem_ProcessDelayedNoDealloc(PyThreadState *tstate,
delayed_dealloc_cb cb, void *state);
// Abandon all thread-local delayed free requests and push them to the
// interpreter's queue.
extern void _PyMem_AbandonDelayed(PyThreadState *tstate);