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Double check the programming guide to make sure you are not using a feature of OpenCL that is not currently supported. The compiler should flag cases such as these but it could be failing silently.
If you have multiple kernels in the hardware have you debugged down to the point where you know which kernel appears to be hanging? If not I would do that so that you can focus your debug efforts on that single kernel.
Last but not least, does your application code implement error checking and handling? If not I would add that since it could be a failure happening much earlier than the kernel launch causing this.
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The only adv. feature is local mem barrier and it is applied to 256 threads so it should be fine.
The message is quite rare. so far I was able to clear a few kernels with light weight step-in/step-out checks but so far I could not pin point the exact kernel causing this.
All API calls are error checked. As far as I can see the issue is caused by kernel code.
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