Hi Jun,
Many thanks for your report. I just created https://bitbucket.org/stackless-dev/stackless/issues/129/calling-pytasklet_new-null-crashes for your report. It is indeed a regression. I'll fix it soon. Stay tuned for the upcoming Stackless 3.5.3. CU Anselm Von: Stackless [mailto:stackless-boun...@stackless.com] Im Auftrag von Liu, Jun Gesendet: Mittwoch, 12. April 2017 01:06 An: 'stackless@stackless.com' Betreff: [Stackless] calling PyTasklet_New( NULL, ...) crashes Hi, I am using stackless python 3.4.2. I'd like to know if anyone that has used PyTasklet_New function encountered the same problem when passing in NULL as the first argument. According to the documentation, "PyTaskletObject *PyTasklet_New(PyTypeObject *type, PyObject *func) Return a new tasklet object. type must be derived from PyTasklet_Type or NULL. func must be a callable object (normal use-case) or NULL, if the tasklet is being used via capture()." But it crashes when I pass in NULL as first argument. I looked at the source code, and it is: PyTasklet_New(PyTypeObject *type, PyObject *func) { if (!PyType_IsSubtype(type, &PyTasklet_Type)) { PyErr_SetNone(PyExc_TypeError); return NULL; } ...... } int PyType_IsSubtype(PyTypeObject *a, PyTypeObject *b) { PyObject *mro; mro = a->tp_mro; .... } So the pointer is dereferenced without being checked thus causing the crash? Jun
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