On Fri, Apr 28, 2017 at 11:29:55AM -0400, Dave Jones wrote: > On Fri, Apr 21, 2017 at 06:54:30PM +0100, Al Viro wrote: > > On Wed, Apr 12, 2017 at 03:03:18PM -0400, Dave Jones wrote: > > > > > Well it's been running an hour without incident, which looks promising. > > > I'll leave it run, but I'd say you're on the right track given how quick > > > it reproduced so far. > > > > Could you try this and see if it works? What happens is that unlike > > e.g. generic_file_read_iter/generic_file_write_iter, NFS O_DIRECT handling > > does not make sure that iov_iter had been advanced by the amount > > actually transferred - it is left advanced by the amount *requested*. > > Crap. So I never ran it long enough it seems. I can still hit that trace. > I re-added one of your earlier debug patches, and got this..
Could you send me the diff against something from mainline (identified by sha1, ideally)?
