title: TensorFlow: InternalError: Blas SGEMM launch failed
body: <p>When I run <code>sess.run(train_step, feed_dict={x: batch_xs, y_: batch_ys})</code> I get <code>InternalError: Blas SGEMM launch failed</code>. Here is the full error and stack trace:</p>
  
  <pre><code>InternalErrorTraceback (most recent call last)
  &lt;ipython-input-9-a3261a02bdce&gt; in &lt;module&gt;()
        1 batch_xs, batch_ys = mnist.train.next_batch(100)
  ----&gt; 2 sess.run(train_step, feed_dict={x: batch_xs, y_: batch_ys})
  
  /usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in run(self, fetches, feed_dict, options, run_metadata)
      338     try:
      339       result = self._run(None, fetches, feed_dict, options_ptr,
  --&gt; 340                          run_metadata_ptr)
      341       if run_metadata:
      342         proto_data = tf_session.TF_GetBuffer(run_metadata_ptr)
  
  /usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in _run(self, handle, fetches, feed_dict, options, run_metadata)
      562     try:
      563       results = self._do_run(handle, target_list, unique_fetches,
  --&gt; 564                              feed_dict_string, options, run_metadata)
      565     finally:
      566       # The movers are no longer used. Delete them.
  
  /usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in _do_run(self, handle, target_list, fetch_list, feed_dict, options, run_metadata)
      635     if handle is None:
      636       return self._do_call(_run_fn, self._session, feed_dict, fetch_list,
  --&gt; 637                            target_list, options, run_metadata)
      638     else:
      639       return self._do_call(_prun_fn, self._session, handle, feed_dict,
  
  /usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in _do_call(self, fn, *args)
      657       # pylint: disable=protected-access
      658       raise errors._make_specific_exception(node_def, op, error_message,
  --&gt; 659                                             e.code)
      660       # pylint: enable=protected-access
      661 
  
  InternalError: Blas SGEMM launch failed : a.shape=(100, 784), b.shape=(784, 10), m=100, n=10, k=784
       [[Node: MatMul = MatMul[T=DT_FLOAT, transpose_a=false, transpose_b=false, _device="/job:localhost/replica:0/task:0/gpu:0"](_recv_Placeholder_0/_4, Variable/read)]]
  Caused by op u'MatMul', defined at:
    File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
      "__main__", fname, loader, pkg_name)
    File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
      exec code in run_globals
    File "/usr/local/lib/python2.7/dist-packages/ipykernel/__main__.py", line 3, in &lt;module&gt;
      app.launch_new_instance()
    File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 596, in launch_instance
      app.start()
    File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelapp.py", line 442, in start
      ioloop.IOLoop.instance().start()
    File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/ioloop.py", line 162, in start
      super(ZMQIOLoop, self).start()
    File "/usr/local/lib/python2.7/dist-packages/tornado/ioloop.py", line 883, in start
      handler_func(fd_obj, events)
    File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 275, in null_wrapper
      return fn(*args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/zmqstream.py", line 440, in _handle_events
      self._handle_recv()
    File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/zmqstream.py", line 472, in _handle_recv
      self._run_callback(callback, msg)
    File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/zmqstream.py", line 414, in _run_callback
      callback(*args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 275, in null_wrapper
      return fn(*args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelbase.py", line 276, in dispatcher
      return self.dispatch_shell(stream, msg)
    File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelbase.py", line 228, in dispatch_shell
      handler(stream, idents, msg)
    File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelbase.py", line 391, in execute_request
      user_expressions, allow_stdin)
    File "/usr/local/lib/python2.7/dist-packages/ipykernel/ipkernel.py", line 199, in do_execute
      shell.run_cell(code, store_history=store_history, silent=silent)
    File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 2723, in run_cell
      interactivity=interactivity, compiler=compiler, result=result)
    File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 2825, in run_ast_nodes
      if self.run_code(code, result):
    File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 2885, in run_code
      exec(code_obj, self.user_global_ns, self.user_ns)
    File "&lt;ipython-input-4-d7414c4b6213&gt;", line 4, in &lt;module&gt;
      y = tf.nn.softmax(tf.matmul(x, W) + b)
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/math_ops.py", line 1036, in matmul
      name=name)
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/gen_math_ops.py", line 911, in _mat_mul
      transpose_b=transpose_b, name=name)
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/op_def_library.py", line 655, in apply_op
      op_def=op_def)
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/ops.py", line 2154, in create_op
      original_op=self._default_original_op, op_def=op_def)
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/ops.py", line 1154, in __init__
      self._traceback = _extract_stack()
  </code></pre>
  
  <p>Stack: EC2 g2.8xlarge machine, Ubuntu 14.04</p>