title: CUDA 4.2 nvcc (cicc) error while compiling with sm_21
body: <p>I have a strange problem! I have a GTX 560 Ti card (compute capability 2.1) where I develop my CUDA apps. </p>
  
  <p>Now after some hundred times of compiling, I got an error. That is, the compilation phase stops, with the cicc process not terminating. But when I change my number of threads per block number, it sometimes may compile. (For 64 threads it crashes for 1024 it works). </p>
  
  <p>Does anyone had such a strange error.
  The other thing is, that with sm_13 it compiles every time, but with -arch=sm_21 it won't.
  But as I said it ran hundreds of times with this option, but now it will not work any more.
  Any suggestions?</p>