On Tue, 28 Feb 2017 09:06:13 -0800
James Bottomley <j...@linux.vnet.ibm.com> wrote:
> On Tue, 2017-02-28 at 08:32 -0700, Jens Axboe wrote:
> > On 02/28/2017 07:08 AM, Christoph Hellwig wrote:
> > > On Mon, Feb 27, 2017 at 05:19:31PM -0800, Stephen Hemminger wrote:
> > > > Fixes: ee5242360424 ("scsi: zero per-cmd driver data before each
> > > > I/O")
> > > >
> > > > but that is already in linux-next.
> > > >
> > > > Noticed another place where memset(of the data was being done not
> > > > the extra bits.
> > > > Tried this, but didn't fix it either...
> > >
> > > Are you using blk-mq or the legacy request code?
> >
> > Stephen doesn't have MQ set in the config he posted, I'm assuming he
> > didn't boot with scsi_mod.use_blk_mq=true. In a previous email, I
> > asked if turning on MQ makes a difference.
>
> OK, since we're not making much progress, Stephen, could you insert
> some debugging into the storvsc driver? The trace clearly shows we're
> getting zeros back in the buffer when we should have data from the
> initial scan. Firstly, does the vmbus think it's transferring any data
> for the INQUIRY and READ_CAPACITY commands (looks like
> storvsc_command_completion() data_transfer_length)? If it does,
> there's probably an issue initialising the sg list. If it doesn't,
> we're probably sending bogus commands.
>
> James
I tried booting with scsi_mod.use_blk_mq=true and that did nothing.
Rebuilding now with
CONFIG_SCSI_MQ_DEFAULT=y
Sure, can instrument. after that test.
