Julien Palard added the comment:
FWIW, in _PyType_Lookup I see the "300" PyLong being cached, and later, just
before the segfault, I see its address getting out of the cache (a cache hit)
but it's no longer a PyLong, it's scrambled, so we're getting a real pointer
with scrambled values on the line:
attribute = _PyType_Lookup(type, name);
segfaulting two lines later in:
descrgetfunc local_get = Py_TYPE(attribute)->tp_descr_get
When I write scrambled value I mean:
(gdb) p *attribute
$21 = {_ob_next = 0xdbdbdbdbdbdbdbdb, _ob_prev = 0xdbdbdbdbdbdbdbdb,
ob_refcnt = -2604246222170760229, ob_type = 0xdbdbdbd\
bdbdbdbdb}
To debug interactive session in GDB I used:
r -i weird.py < stdin
with "proxy.x" in the stdin file.
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nosy: +mdk
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<http://bugs.python.org/issue28866>
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