On Wed, Oct 26, 2016 at 05:03:45PM -0600, Jens Axboe wrote:
> On 10/26/2016 04:58 PM, Linus Torvalds wrote:
> > On Wed, Oct 26, 2016 at 3:51 PM, Linus Torvalds
> > <torva...@linux-foundation.org> wrote:
> >>
> >> Dave: it might be a good idea to split that "WARN_ON_ONCE()" in
> >> blk_mq_merge_queue_io() into two
> >
> > I did that myself too, since Dave sees this during boot.
> >
> > But I'm not getting the warning ;(
> >
> > Dave gets it with ext4, and thats' what I have too, so I'm not sure
> > what the required trigger would be.
>
> Actually, I think I see what might trigger it. You are on nvme, iirc,
> and that has a deep queue. Dave, are you testing on a sata drive or
> something similar with a shallower queue depth? If we end up sleeping
> for a request, I think we could trigger data->ctx being different.
yeah, just regular sata. I've been meaning to put an ssd in that box for
a while, but now it sounds like my procrastination may have paid off.
> Dave, can you hit the warnings with this? Totally untested...
Coming up..
Dave
