edit: the issue is actually hash randomization and a bug in scipy, see below

the fix for gh-2738 (commit e208de6) in numpy 1.7.0rc1 breaks a scipy 0.11 and current git head test with python3.3.
This was previously reported to scipy in http://mail.scipy.org/pipermail/scipy-dev/2012-September/017995.html but I did not find a reaction.
Bisecting numpy lead to above commit.

The crash can be reproduced on ubuntu 13.04 with python3.3.
It occurs with the debug and regular python3.3 variant.
It manifests itself with random segfaults, glibc memory corruption aborts and hangs when you execute scipy/linalg/tests/test_decomp.py
reverting the commit from the rc1 tag fixes the crash.
numpy git head does not seem affected.