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

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Message-ID: <20100512194622.GA31418@suse.de>
Date:	Wed, 12 May 2010 12:46:22 -0700
From:	Greg KH <gregkh@...e.de>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	CaT <cat@....com.au>, 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 Wed, May 12, 2010 at 12:34:20PM +0800, Américo Wang wrote:
> On Tue, May 11, 2010 at 08:03:20AM -0700, Greg KH wrote:
> >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.
> >
> 
> How about reverting that patch for 2.6.33 stable tree?

No, as that patch is not reverted in Linus's tree, right?  Just turn off
lockdep if this is bothering you.

thanks,

greg k-h
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