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SubjectRe: [PATCH] scsi: fix sense_slab/bio swapping livelock
On Mon, 7 Apr 2008, Hugh Dickins wrote:
> On Sun, 6 Apr 2008, James Bottomley wrote:
> >
> > This was sort of accidentally fixed in scsi-misc by commit
> >
> > commit c5f73260b289cb974928eac05f2d84e58ddfc020
> > Author: James Bottomley <>
> > Date: Thu Mar 13 11:16:33 2008 -0500
> >
> > [SCSI] consolidate command allocation in a single place
> Thanks, yes, that looks a good substitute to me.
> > Could you check that:
> >
> >
> >
> > and see if it alleviates the problem? ... if so, we can work out which
> > pieces to backport.
> Precisely that patch seems appropriate to 2.6.25-rc8-git, so I'm now
> running the test with just that applied to 2.6.25-rc8 (plus cfq rcu
> fix). Not quite what you asked, but...
> Strictly speaking, it'd take a couple of days to be reasonably sure
> that the livelock is gone (it appeared to reproduce quicker once I
> moved to -rc8 plus cfq rcu fix; but I'm not entirely convinced that
> wasn't just coincidence). But if nothing bad appears overnight,
> let's assume your patch is the one to push: I'll report tomorrow.

Right, as expected, that seems to run fine: I've seen no problem with
it in 17 hours - beyond, of course, all the page allocation failures
which will plague such tests until something else is changed.

Somewhat irrelevant since Linus put my patch into 2.6.25-rc8-git
(probably worth it for the various issues noted in the comment);
but reassuring for 2.6.26.

I'll stop that test now and put it to work on something else.


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