Bob Halley <hal...@dnspython.org> added the comment:
I rebuilt using --with-pydebug and -O0 -g. It now triggers an assertion a bit
earlier.
test_finalize (__main__.WithProcessesTestFinalize) ... Assertion failed:
(op->ob_refcnt == 0), function _PyTrash_destroy_chain, file Objects/object.c,
line 2433
(gdb) bt
#0 0x00007fff8791c3d6 in __kill ()
#1 0x00007fff879bc972 in abort ()
#2 0x00007fff879a99b4 in __assert_rtn ()
#3 0x00000001000796e0 in _PyTrash_destroy_chain () at Objects/object.c:2433
#4 0x0000000100053efe in list_dealloc (op=0x10114cc18) at
Objects/listobject.c:317
#5 0x000000010007905b in _Py_Dealloc (op=0x10114cc18) at Objects/object.c:2228
#6 0x000000010005aee7 in listiter_next (it=0x10160d610) at
Objects/listobject.c:2917
#7 0x00000001001158c8 in PyEval_EvalFrameEx (f=0x1014c72c0, throwflag=0) at
Python/ceval.c:2496
[ ... snip ... ]
(gdb) f 3
#3 0x00000001000796e0 in _PyTrash_destroy_chain () at Objects/object.c:2433
2433 assert(op->ob_refcnt == 0);
(gdb) list
2428 * fool Py_DECREF into calling it indirectly, but
2429 * Py_DECREF was already called on this object, and in
2430 * assorted non-release builds calling Py_DECREF again ends
2431 * up distorting allocation statistics.
2432 */
2433 assert(op->ob_refcnt == 0);
2434 ++_PyTrash_delete_nesting;
2435 (*dealloc)(op);
2436 --_PyTrash_delete_nesting;
2437 }
(gdb) p *op
$2 = {
_ob_next = 0x0,
_ob_prev = 0x0,
ob_refcnt = 1,
ob_type = 0x101441d70
}
(gdb) p *op->ob_type
$4 = {
_ob_next = 0x10076d798,
_ob_prev = 0x101442930,
ob_refcnt = 9,
ob_type = 0x1001f84e0,
ob_size = 0,
tp_name = 0x1013e88b4 "Semaphore",
tp_basicsize = 48,
tp_itemsize = 0,
tp_dealloc = 0x10009dd9d <subtype_dealloc>,
tp_print = 0,
tp_getattr = 0,
tp_setattr = 0,
tp_compare = 0,
tp_repr = 0x1000af4a0 <slot_tp_repr>,
tp_as_number = 0x101441f08,
tp_as_sequence = 0x101442058,
tp_as_mapping = 0x101442040,
tp_hash = 0x1000761bc <_Py_HashPointer>,
tp_call = 0,
tp_str = 0x1000a44e4 <object_str>,
tp_getattro = 0x10007728a <PyObject_GenericGetAttr>,
tp_setattro = 0x100077676 <PyObject_GenericSetAttr>,
tp_as_buffer = 0x1014420a8,
tp_flags = 940027,
tp_doc = 0x0,
tp_traverse = 0x10009da40 <subtype_traverse>,
tp_clear = 0x10009dce5 <subtype_clear>,
tp_richcompare = 0,
tp_weaklistoffset = 40,
tp_iter = 0,
tp_iternext = 0x100076c13 <_PyObject_NextNotImplemented>,
tp_methods = 0x0,
tp_members = 0x1014420e8,
tp_getset = 0x0,
tp_base = 0x1014499f0,
tp_dict = 0x101442930,
tp_descr_get = 0,
tp_descr_set = 0,
tp_dictoffset = 32,
tp_init = 0x1000b06dd <slot_tp_init>,
tp_alloc = 0x10009d7a7 <PyType_GenericAlloc>,
tp_new = 0x1000a3f03 <object_new>,
tp_free = 0x10016bda4 <PyObject_GC_Del>,
tp_is_gc = 0,
tp_bases = 0x1010bc840,
tp_mro = 0x100744060,
tp_cache = 0x0,
tp_subclasses = 0x10074d240,
tp_weaklist = 0x10075f528,
tp_del = 0,
tp_version_tag = 194
}
----------
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