[sky@localhost cutecat]$ cat /tmp/lzma_segfault.py 
import lzma
file = lzma.LZMAFile("/tmp/file.lzma", "w")
file.write(b"xxxx")
file.close()
with lzma.LZMAFile("/tmp/file.lzma", "w") as f:
    f.__init__("non-existent")
[sky@localhost cutecat]$ python /tmp/lzma_segfault.py 
Segmentation fault (core dumped)

See also issue19878.

I'll provide the patch tomorrow.

To clarify, which version(s) does this affect? I have not been able to
reproduce against 3.4, and 2.7 does not included the lzma module in the
first place.

Wait, you're right. I have not been able to reproduce this under Python downloaded from Python.org.

[sky@localhost cpython2.7]$ ./python
Python 2.7.6+ (2.7:ae9fb85ab4e0, Dec  5 2013, 08:24:11) 
[GCC 4.7.2 20121109 (Red Hat 4.7.2-8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import lzma
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named lzma
[40709 refs]

The python is from Fedora itself. Maybe I did some funky stuff in my Fedora installation. Let me check this first and report to you later.

[sky@localhost cpython2.7]$ python
Python 2.7.3 (default, Aug  9 2012, 17:23:57) 
[GCC 4.7.1 20120720 (Red Hat 4.7.1-5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import lzma
>>> lzma
<module 'lzma' from '/usr/lib64/python2.7/site-packages/lzma.so'>

Okay, sorry guys. The python 2.7 lzma binding is Fedora specific one. I already submitted bug there: https://bugzilla.redhat.com/show_bug.cgi?id=1048581