linux-kernel - Re: Hang in md-raid1 with 3.7-rcX

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Message-ID: <20121129072646.0bcb3a2a@notabene.brown>
Date:	Thu, 29 Nov 2012 07:26:46 +1100
From:	NeilBrown <neilb@...e.de>
To:	Tvrtko Ursulin <tvrtko.ursulin@...lan.co.uk>
Cc:	Torsten Kaiser <just.for.lkml@...glemail.com>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Hang in md-raid1 with 3.7-rcX

On Wed, 28 Nov 2012 14:51:59 +0000 Tvrtko Ursulin
<tvrtko.ursulin@...lan.co.uk> wrote:

> On Tuesday 27 November 2012 12:05:28 NeilBrown wrote:
> > On Sat, 24 Nov 2012 10:18:44 +0100 Torsten Kaiser
> > 
> > <just.for.lkml@...glemail.com> wrote:
> > > After my system got stuck with 3.7.0-rc2 as reported in
> > > http://marc.info/?l=linux-kernel&m=135142236520624 LOCKDEP seem to
> > > blame XFS, because it found 2 possible deadlocks. But after these
> > > locking issues where fixed, my system got stuck again with 3.7.0-rc6
> > > as reported in http://marc.info/?l=linux-kernel&m=135344072325490
> > > Dave Chinner thinks its an issue within md, that it gets stuck and
> > > that will then prevent any further xfs activity, and that I should
> > > report it to the raid mailing list.
> > > 
> > > The issue seems to be that multiple processes (kswapd0, xfsaild/md4
> > > and flush-9:4) get stuck in md_super_wait() like this:
> > > [<ffffffff816b1224>] schedule+0x24/0x60
> > > [<ffffffff814f9dad>] md_super_wait+0x4d/0x80
> > > [<ffffffff8105ca30>] ? __init_waitqueue_head+0x60/0x60
> > > [<ffffffff81500753>] bitmap_unplug+0x173/0x180
> > > [<ffffffff810b6acf>] ? write_cache_pages+0x12f/0x420
> > > [<ffffffff810b6700>] ? set_page_dirty_lock+0x60/0x60
> > > [<ffffffff814e8eb8>] raid1_unplug+0x98/0x110
> > > [<ffffffff81278a6d>] blk_flush_plug_list+0xad/0x240
> > > [<ffffffff81278c13>] blk_finish_plug+0x13/0x50
> > > 
> > > The full hung-tasks stack traces and the output from SysRq+W can be
> > > found at http://marc.info/?l=linux-kernel&m=135344072325490 or in the
> > > LKML thread 'Hang in XFS reclaim on 3.7.0-rc3'.
> > 
> > Yes, it does look like an md bug....
> > Can you test to see if this fixes it?
> 
> Hi,
> 
> Would this bug be present in 3.6 as well? Because I am hitting something which 
> looks pretty much like this with 3.6.x. In which case it should go to -stable, 
> however I am not able to test on the affected machine at the moment.
> 
> Regards,
> 
> Tvrtko

Yes it is in 3.6, and it will go to -stable.

Thanks,
NeilBrown

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