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gh-143547: Fix PyErr_FormatUnraisable() fallback (#143557)

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Hold a strong reference to 'hook' while calling the default
unraisable took to log hook failure.

Fix test_sys.UnraisableHookTest: use the right decorator function to
disable colors. Previously, tests were always skipped.
This commit is contained in:
Victor Stinner 2026-01-09 13:16:22 +01:00 • committed by GitHub
parent 6d54b6ac7d
commit 39a2bcf949
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3 changed files with 7 additions and 5 deletions
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6
Python/errors.c
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@ -1656,6 +1656,7 @@ format_unraisable_v(const char *format, va_list va, PyObject *obj)
_Py_EnsureTstateNotNULL(tstate);
PyObject *err_msg = NULL;
PyObject *hook = NULL;
PyObject *exc_type, *exc_value, *exc_tb;
_PyErr_Fetch(tstate, &exc_type, &exc_value, &exc_tb);
@ -1700,7 +1701,6 @@ format_unraisable_v(const char *format, va_list va, PyObject *obj)
goto error;
}
PyObject *hook;
if (PySys_GetOptionalAttr(&_Py_ID(unraisablehook), &hook) < 0) {
Py_DECREF(hook_args);
err_msg_str = NULL;
@ -1713,7 +1713,6 @@ format_unraisable_v(const char *format, va_list va, PyObject *obj)
}
if (_PySys_Audit(tstate, "sys.unraisablehook", "OO", hook, hook_args) < 0) {
Py_DECREF(hook);
Py_DECREF(hook_args);
err_msg_str = "Exception ignored in audit hook";
obj = NULL;
@ -1721,13 +1720,11 @@ format_unraisable_v(const char *format, va_list va, PyObject *obj)
}
if (hook == Py_None) {
Py_DECREF(hook);
Py_DECREF(hook_args);
goto default_hook;
}
PyObject *res = PyObject_CallOneArg(hook, hook_args);
Py_DECREF(hook);
Py_DECREF(hook_args);
if (res != NULL) {
Py_DECREF(res);
@ -1757,6 +1754,7 @@ format_unraisable_v(const char *format, va_list va, PyObject *obj)
Py_XDECREF(exc_value);
Py_XDECREF(exc_tb);
Py_XDECREF(err_msg);
Py_XDECREF(hook);
_PyErr_Clear(tstate); /* Just in case */
}