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

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Date:	Tue, 11 May 2010 08:03:20 -0700
From:	Greg KH <gregkh@...e.de>
To:	CaT <cat@....com.au>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	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>
Subject: Re: 2.6.33.3: possible recursive locking detected

On Tue, May 11, 2010 at 09:33:50PM +1000, CaT wrote:
> 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. :)

Just ignore the lockdep warnings as they are bogus, or turn them off, or
use .34-rc7, as they are resolved there.

thanks,

greg k-h
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