Messages in this thread |  | | Date | Mon, 7 Apr 2008 18:51:08 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: [PATCH] scsi: fix sense_slab/bio swapping livelock |
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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 <James.Bottomley@HansenPartnership.com> > > 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: > > > > master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6.git > > > > 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.
Hugh
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