Saida Dhanavath added the comment: Hi Christian Heimes,
Please ignore typos in the previous post. I have written some code to simulate and test PyWeakReference struct instantiation and then hit segfault based on the flag passed to C code. Here I am trying to execute some of the operations from new_weakref and dealloc_weakref of Objects/weakrefobject.c to show that new instance of PyWeakReference is not initialized properly and results in segfault. Have also checked python 3.6.0 source and I do not see any change in weakref alloc and dealloc routines of 2.7.8 and 3.6.0 versions. Have run test code on 2.7.8, 2.7.12+, 3.4m and 3.5m interpreters and got segfault in all runs. Please find the sample output as given below. ubuntu@ubuntu1610saida:~/weakref$ make build PYVERSION=2.7 swig -python weakref_crash.i gcc -w -fpic -c weakref_crash.c weakref_crash_wrap.c -I/usr/include/python2.7 gcc -shared weakref_crash.o weakref_crash_wrap.o -o _pyweakref_crash.so -L/usr/lib/python2.7 -lpython2.7 ubuntu@ubuntu1610saida:~/weakref$ python test.py 0 0 2.7.12+ (default, Sep 17 2016, 12:08:02) [GCC 6.2.0 20160914] 0 0 ubuntu@ubuntu1610saida:~/weakref$ python test.py 0 1 2.7.12+ (default, Sep 17 2016, 12:08:02) [GCC 6.2.0 20160914] 0 0 ubuntu@ubuntu1610saida:~/weakref$ python test.py 1 0 2.7.12+ (default, Sep 17 2016, 12:08:02) [GCC 6.2.0 20160914] 1010101 1010101 ubuntu@ubuntu1610saida:~/weakref$ python test.py 1 1 2.7.12+ (default, Sep 17 2016, 12:08:02) [GCC 6.2.0 20160914] 1010101 1010101 Segmentation fault (core dumped) ubuntu@ubuntu1610saida:~/weakref$ make clean rm -f *.so *.o *crash.py *.pyc *crash_wrap.c ubuntu@ubuntu1610saida:~/weakref$ make build PYVERSION=3.5m swig -python weakref_crash.i gcc -w -fpic -c weakref_crash.c weakref_crash_wrap.c -I/usr/include/python3.5m gcc -shared weakref_crash.o weakref_crash_wrap.o -o _pyweakref_crash.so -L/usr/lib/python3.5m -lpython3.5m ubuntu@ubuntu1610saida:~/weakref$ python3.5m test.py 0 0 3.5.2+ (default, Sep 22 2016, 12:18:14) [GCC 6.2.0 20160927] 0 0 ubuntu@ubuntu1610saida:~/weakref$ python3.5m test.py 0 1 3.5.2+ (default, Sep 22 2016, 12:18:14) [GCC 6.2.0 20160927] 0 0 ubuntu@ubuntu1610saida:~/weakref$ python3.5m test.py 1 0 3.5.2+ (default, Sep 22 2016, 12:18:14) [GCC 6.2.0 20160927] 1010101 101 ubuntu@ubuntu1610saida:~/weakref$ python3.5m test.py 1 1 3.5.2+ (default, Sep 22 2016, 12:18:14) [GCC 6.2.0 20160927] 1010101 101 Segmentation fault (core dumped) ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue29347> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
