On Tue, Sep 19, 2017 at 08:55:59AM +0800, jianchao.wang wrote: > > But can you elaborate a little more on how this found and if there > > is a way to easily reproduce it, say for a blktests test case? > > > It is found when I made the patch of > 'block: consider merge of segments when merge bio into rq' , not from an actual > issue or test case. Same question applies to that one, I just haven't finished understanding all the changes in it yet.