Hi Jens On 08/27/2018 10:51 PM, Jens Axboe wrote: >>> I cannot get the point of "since we can't rely on just being woken from the ->func handler >>> we set". >>> Do you mean there could be someone else could wake up this task ? > Yeah, you don't know for a fact that the wbt wait queue is the only > guy waking us up. Any sleep like this needs a loop. It was quite > easy to reproduce for me, and as expected, you'll get list corruption > on the wait queue since we leave it on the list and the stack goes > away. > Yes, got it. Thanks for your kindly response. :) Thanks Jianchao