New submission from Christian Heimes:
The issue was reported by Arfrever on #python-dev. The test suite of simpletal
[1] was segfaulting with Python 3.3. It doesn't segfault without the
_elementtree C extension.
I'm able to reproduce the issue. It may take a couple of runs with a debug
build of Python but eventually Python segfaults. So far segfaults occur inside
a GC collection run. Benjamin suspects the issue is related to the new GC code
in _elementtree.
#0 visit_decref (op=<unknown at remote 0x7fea64fc8ca8>, data=0x0) at
Modules/gcmodule.c:361
#1 0x00000000004bccd5 in subtract_refs (containers=<optimized out>) at
Modules/gcmodule.c:386
#2 collect (generation=0, n_collected=0x7fffe3eedb70,
n_uncollectable=0x7fffe3eedb78) at Modules/gcmodule.c:891
#3 0x00000000004bd7e6 in collect_with_callback (generation=0) at
Modules/gcmodule.c:1048
#4 collect_generations () at Modules/gcmodule.c:1071
#5 _PyObject_GC_Malloc (basicsize=<optimized out>) at
Modules/gcmodule.c:1580
#6 0x00000000004bddcc in _PyObject_GC_Malloc (basicsize=<optimized out>)
at Modules/gcmodule.c:1567
#7 _PyObject_GC_New (tp=0x8322a0) at Modules/gcmodule.c:1590
#8 0x0000000000548a3a in new_dict (values=0x0, keys=0xd02e60) at
Objects/dictobject.c:395
#9 _PyDict_NewPresized (minused=<optimized out>) at
Objects/dictobject.c:1044
#10 0x000000000047a449 in PyEval_EvalFrameEx (f=<optimized out>,
throwflag=<optimized out>) at Python/ceval.c:2245
#11 0x0000000000480b03 in fast_function (nk=<optimized out>, na=1,
n=<optimized out>, pp_stack=0x7fffe3eede40, func=
<function at remote 0x7fea653ff9e0>) at Python/ceval.c:4150
[1] http://www.owlfish.com/software/simpleTAL/downloads/SimpleTAL-5.1.tar.gz
----------
components: Extension Modules
keywords: 3.3regression
messages: 171603
nosy: christian.heimes
priority: critical
severity: normal
stage: needs patch
status: open
title: _elementtree causes segfault in GC
type: crash
versions: Python 3.3, Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16089>
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