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

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Message-ID: <18227.33346.994456.270194@fisica.ufpr.br>
Date:	Thu, 8 Nov 2007 19:40:18 -0200
From:	carlos@...ica.ufpr.br (Carlos Carvalho)
To:	Jeff Lessem <Jeff@...sem.org>, root@...l.ufpr.br
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 (Jeff@...sem.org) wrote on 6 November 2007 22:00:
 >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.
 >
 >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.

Us too! We're stuck trying to build a disk server with several disks
in a raid5 array, and the rsync from the old machine stops writing to
the new filesystem. It only happens under heavy IO. We can make it
lock without rsync, using 8 simultaneous dd's to the array. All IO
stops, including the resync after a newly created raid or after an
unclean reboot.

We could not trigger the problem with ext3 or reiser3; it only happens
with xfs.
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