Comment # 2 on bug 74190 from Thomas Rohloff

(In reply to comment #1)
> This may be the same issue I reported in
> https://bugs.freedesktop.org/show_bug.cgi?id=74140
> 
> If you check CPU usage, you should see a thread stuck at 100% - this is
> apparently it trying to compile the opencl program.  I have not tried
> waiting a long time to see if it does eventually fire up.

Yes, that seems to be it.

But there seems to be a memory leak, too. The thread eats up more and more RAM.
Also after each

 [2014-02-24 10:00:47] OCL 0: Idle for more than 60 seconds, declaring SICK!
 [2014-02-24 10:00:47] OCL 0: Attempting to restart
 [2014-02-24 10:00:47] Thread 0 still exists, killing it off
 [2014-02-24 10:00:48] Thread 0 restarted

it eats +1 core (so first 100%, then after that 200%, after the next 300% and
so on). This repeats till it's killed cause of no more free RAM.

Should I add this information to your bug report?

*** This bug has been marked as a duplicate of bug 74140 ***