In a recent deployment of the recommended system environment, a very wonderful experience both problems

Problem Description:

../anaconda2/lib/python2.7/site-packages/sklearn/externals/joblib/_multiprocessing_helpers.py:38: UserWarning: [Errno 13] Permission denied.  joblib will operate in serial mode
  warnings.warn('%s.  joblib will operate in serial mode' % (e,))
Segmentation fault

Yes, mistakes happen, use gdb tracking information, did not find, that is not multi-process, only the serial.

solution:

ls -ld /dev/shm
sudo chmod 777 /dev/shm