Hi Greg, On Mon, Dec 24, 2018 at 12:52:22PM +0100, gregkh@linuxfoundation.org wrote: > > The patch below does not apply to the 4.14-stable tree. > If someone wants it applied there, or to any other stable or longterm > tree, then please email the backport, including the original git commit > id to . The attached backported patch should apply to 4.14-stable tree. I think we have a real usecase which is triggering this error and I was still in the middle of debugging that. But my initial analysis was showing that the userspace thread was stuck in the indefinite loop. I have a reliable reproducer of the problem and will setup a test tomorrow and confirm. -- Regards Sudip