linux-kernel - Re: 2.6.33.3: possible recursive locking detected

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Message-ID: <20100511113350.GW2657@zip.com.au>
Date:	Tue, 11 May 2010 21:33:50 +1000
From:	CaT <cat@....com.au>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Yong Zhang <yong.zhang@...driver.com>, lkml@....com.au,
	mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>, Greg KH <gregkh@...e.de>
Subject: Re: 2.6.33.3: possible recursive locking detected

On Wed, May 05, 2010 at 10:52:50AM +0800, Américo Wang wrote:
> On Wed, May 5, 2010 at 10:32 AM, Yong Zhang <yong.zhang@...driver.com> wrote:
> > On Tue, May 04, 2010 at 11:37:37AM +0300, Avi Kivity wrote:
> >> On 05/04/2010 10:03 AM, CaT wrote:
> >> >I'm currently running 2.6.33.3 in a KVM instance emulating a core2duo
> >> >on 1 cpu with virtio HDs running on top of a core2duo host running 2.6.33.3.
> >> >qemu-kvm version 0.12.3.
> >
> > Can you try commit 6992f5334995af474c2b58d010d08bc597f0f2fe in the latest
> > kernel?
> >
> 
> Hmm, 2.6.33 -stable has commit 846f99749ab68bbc7f75c74fec305de675b1a1bf?
> 
> Actually, these 3 commits fixed it:
> 
> 6992f5334995af474c2b58d010d08bc597f0f2fe sysfs: Use one lockdep class
> per sysfs ttribute.
> a2db6842873c8e5a70652f278d469128cb52db70 sysfs: Only take active
> references on attributes.
> e72ceb8ccac5f770b3e696e09bb673dca7024b20 sysfs: Remove sysfs_get/put_active_two
> 
> However, there are many other patches needed to amend these, so I think
> it's not suitable for -stable to include, perhaps a revert of
> 846f99749ab68bbc7f75c74fec305de675b1a1bf is better.

Slightly at a loss as to what to do, now. It's a virt instance so I can
apply patches at will but, well, clarity is good. :)

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