Is my libopenblas broken?

reproduce?

$ nix-shell -p python3Full -p python3Packages.numpy -p python3Packages.matplotlib -p qt4 -p python3Packages.pyqt4
$ python
Python 3.5.3 (default, Jan 17 2017, 07:57:56) 
[GCC 5.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib as mpl
>>> mpl.use("Qt4Agg")
>>> import matplotlib.pyplot as plt
>>> plt.plot()
[]
>>> plt.show()
Segmentation fault



python[32686]: segfault at 801dea498 ip 00007f51c9c99187 sp 00007ffe45f2eb38 error 4 in libopenblasp-r0.2.19.so[7f51c85af000+20b9000]