title: xarray.open_dataset(): Trying to open .nc but I get 'double free or corruption error'
body: <p>I'm trying to read .nc files using the xarray function open_dataset, but when it tries I get this error:</p>
  
  <p>Code:</p>
  
  <pre><code>import xarray as xr
  xr.open_dataset('period1_7-74_mascara-landsat_7_-74_(2014-01-012014-12-31)_output.nc', engine='netcdf4')
  </code></pre>
  
  <p>Error</p>
  
  <pre><code>*** Error in `python': double free or corruption (!prev): 0x0000557e9de69e80 ***
  ======= Backtrace: =========
  /lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f2d5338b7e5]
  /lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f2d5339437a]
  /lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f2d5339853c]
  /home/cubo/anaconda2/lib/python2.7/site-packages/netCDF4/_netCDF4.so(+0x20d66)[0x7f2d3c510d66]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x774c)[0x7f2d540ed6fc]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7e9)[0x7f2d540ef4e9]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(+0x6d377)[0x7f2d54078377]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyObject_Call+0x43)[0x7f2d540537a3]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(+0x5763d)[0x7f2d5406263d]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyObject_Call+0x43)[0x7f2d540537a3]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(+0xa1584)[0x7f2d540ac584]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(+0x9de3b)[0x7f2d540a8e3b]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyObject_Call+0x43)[0x7f2d540537a3]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x3bb9)[0x7f2d540e9b69]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7e9)[0x7f2d540ef4e9]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x6a08)[0x7f2d540ec9b8]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7e9)[0x7f2d540ef4e9]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x6a08)[0x7f2d540ec9b8]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7e9)[0x7f2d540ef4e9]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyEval_EvalCode+0x1a)[0x7f2d540ef70a]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(+0xfd9cd)[0x7f2d541089cd]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyRun_InteractiveOneFlags+0x15e)[0x7f2d5410aa0e]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyRun_InteractiveLoopFlags+0x5f)[0x7f2d5410abaf]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(PyRun_AnyFileExFlags+0x40)[0x7f2d5410b1f0]
  /home/cubo/anaconda2/bin/../lib/libpython2.7.so.1.0(Py_Main+0xbac)[0x7f2d5411cf8c]
  /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f2d53334830]
  python(+0x8bf)[0x557e9968a8bf]
  </code></pre>
  
  <p>I'm working on Ubuntu 16.04.</p>