linux-kernel - Re: 2.6.23.1: mdadm/raid5 hung/d-state

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Date:	Thu, 08 Nov 2007 12:45:42 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Jeff Lessem <Jeff@...sem.org>
CC:	Dan Williams <dan.j.williams@...el.com>,
	BERTRAND Joël <joel.bertrand@...tella.fr>,
	Justin Piszcz <jpiszcz@...idpixels.com>,
	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: 2.6.23.1: mdadm/raid5 hung/d-state

Jeff Lessem wrote:
> Dan Williams wrote:
> > The following patch, also attached, cleans up cases where the code 
> looks
> > at sh->ops.pending when it should be looking at the consistent
> > stack-based snapshot of the operations flags.
>
> I tried this patch (against a stock 2.6.23), and it did not work for
> me.  Not only did I/O to the effected RAID5 & XFS partition stop, but
> also I/O to all other disks.  I was not able to capture any debugging
> information, but I should be able to do that tomorrow when I can hook
> a serial console to the machine.

That can't be good! This is worrisome because Joel is giddy with joy 
because it fixes his iSCSI problems. I was going to try it with nbd, but 
perhaps I'll wait a week or so and see if others have more information. 
Applying patches before a holiday weekend is a good way to avoid time 
off. :-(
>
> I'm not sure if my problem is identical to these others, as mine only
> seems to manifest with RAID5+XFS.  The RAID rebuilds with no problem,
> and I've not had any problems with RAID5+ext3.

Hopefully it's not the raid which is the issue.

-- 
bill davidsen <davidsen@....com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979

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