linux-kernel - Re: 2.6.24-rc7 to 2.6.24-rc8 possible regression

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Message-ID: <Pine.LNX.4.64.0801221453420.15585@alien.or.mcafeemobile.com>
Date:	Tue, 22 Jan 2008 14:54:25 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Denys Fedoryshchenko <denys@...p.net.lb>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: 2.6.24-rc7 to 2.6.24-rc8 possible regression

On Tue, 22 Jan 2008, Stefan Richter wrote:

> (adding Cc: Davide and akpm)
> 
> On 22 Jan, Peter Zijlstra wrote:
> > 
> > On Tue, 2008-01-22 at 17:23 +0100, Stefan Richter wrote:
> >> Denys Fedoryshchenko wrote:
> >> > No, i am using vanilla kernel. It is one of production machines, and as i 
> >> > know screen is not using epoll.
> >> 
> >> OK, but the trace shows that it is the epoll recursion again.
> >> 
> >> > I will try to apply on all my production machines this patch. Sorry if it is 
> >> > related.
> >> 
> >> Well, let's hope that the lockdep annotation or whatever other fix gets
> >> into mainline sooner than later.  Which reminds me to test my setup
> >> again which appeared to be able to reproduce the __wake_up recursion on
> >> my command...
> > 
> > Would be appreciated, I have been waiting on testing feedback because
> > I'm not fully certain here.
> > 
> > Curious though that this gets reported frequently the last few weeks,
> > afaics this problem is way old.
> 
> Here is a report against Fedora's 2.6.23-0.222.rc9.git4.fc8, filed in
> October:  https://bugzilla.redhat.com/show_bug.cgi?id=323411
> 
> I did several tests with a pristine 2.6.24-rc8 now.  The lockdep warning
> below is 100% reliably triggered by grabbing video from a DV camcorder
> with dvgrab v3 via firewire-core's character device file ABI.
> 
> Also, this warning is 100% reliably suppressed by your annotation patch.
> I will reply to this message with this patch for kind consideration by
> those concerned. :-)

Patch? Where is it?



- Davide


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