On Fri, 2014-06-13 at 12:15 -0700, Venkatesh Srinivas wrote:
> On Fri, Jun 13, 2014 at 12:09 PM, James Bottomley
> <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > On Fri, 2014-06-13 at 11:52 -0700, Christoph Hellwig wrote:
> >> On Fri, Jun 13, 2014 at 10:58:22AM -0700, Venkatesh Srinivas wrote:
> >> > CC-ing stable as 3.14 and 3.15 are affected; a conservative fix is to
> >> > enable no_async_abort until the problem is better-understood.
> >>
> >> No patch attached. Nevermind this is not a consdervative fix, but a
> >> band aid. The proper fix is to figure out what's actually going on
> >> here.
> >>
> >> >From your trace above it very much looks like a double completion of
> >> some sort.
> >>
> >> I've looked at the virtio-scsi code a bit, and one odd thing it does
> >> that comes in handy here is that it doesn't really use a traditional
> >> tag, but rather the address of the scsi command.
> >
> > What kernel version? This is the exact signature of the original USB
> > REQUEST_SENSE problem.
>
> Mix of kernels, all 3.14-based. Debian 3.14-0.bpo, Gentoo's 3.14,
> upstream from git as of a few days ago.
>
> Distribution 3.13 and earlier kernels (Debian's 3.2.0-4, Debian
> 3.13-0.bpo.1, Gentoo 3.13.6) do not hit this issue with the same
> workload.
OK, I've no idea what's in distro kernels, so you're looking for this
fix:
commit d555a2abf3481f81303d835046a5ec2c4fb3ca8e
Author: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Date: Fri Mar 28 10:50:17 2014 -0700
[SCSI] Fix spurious request sense in error handling
It went into v3.15-rc3. It looks like it wasn't backported to stable.
James
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