On Mon, May 06, 2019 at 04:19:54PM +0800, Ming Lei wrote: > I remember that this way is the initial version of Jens' patch, however > kernel bug is triggered: > > https://lore.kernel.org/linux-block/20190226034613.GA676@sol.localdomain/ > > Or maybe I miss some recent changes, could you explain it a bit? I'm not even sure how the original would crash.. When I run the rest locally it gets and EBUSY from ioctl LOOP_SET_FD, so I'm not sure what it tends up testing in the end.