On 9:38 17/12, Christoph Hellwig wrote: > On Sun, Dec 16, 2018 at 12:45:19PM +0200, Avi Kivity wrote: > > I did see this on XFS too. The whole thing bothers me, it doesn't happen > > consistently in some setups, which I don't understand. Either it should > > trigger always or never. > > Well, if it also happens in XFS the above change isn't going to fix > it alone, there must be another issue hiding in addition to the error > conversion problems. Are you using multi-device setup as your block device? That could make it return EOPNOTSUPP since we never got to a point where we could merge code which supported bio based devices. -- Goldwyn