Re: Manual driver binding and unbinding broken for SCSI

[Jan Kara <jack@suse.cz>]

On Sun 19-02-17 18:19:58, Omar Sandoval wrote:
> On Fri, Feb 17, 2017 at 04:43:56PM -0800, James Bottomley wrote:
> > This seems to be related to a 0day test we got on the block tree,
> > details here:
> > 
> > http://marc.info/?t=148624068800001
> > 
> > I root caused the above to something not being released when it should
> > be, so it looks like you have the same problem.  It seems to be a
> > recent commit in the block tree, so could you bisect it since you have
> > a nice reproducer?
> 
> These appear to actually be two separate issues.
> 
> The unbind followed by bind crash only happens with scsi-mq. It reproes
> since at least 4.0.
> 
> The unbind followed by a new device coming up crash happens both with
> and without scsi-mq. The earliest version I was able to check for that
> was 4.6, which did reproduce.
> 
> I'll see if I can get some more info on these two issues separately.

Actually, the second issue is only a warning right? And if I understand the
issue correctly, it should be fixed by either Dan's patches in linux-block
or my patch 4 in the series which matches your test results. So that is
dealt with. I have no idea about the first issue though.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR