linux-kernel - Re: [BUG] 2.6.28-git LOCKDEP: Possible recursive rq->lock

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Message-ID: <20090106071018.GC4574@dirshya.in.ibm.com>
Date:	Tue, 6 Jan 2009 12:40:18 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [BUG] 2.6.28-git LOCKDEP: Possible recursive rq->lock

* Ingo Molnar <mingo@...e.hu> [2009-01-05 14:06:38]:

> 
> * Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> wrote:
> 
> > * Peter Zijlstra <a.p.zijlstra@...llo.nl> [2009-01-04 19:08:43]:
> > 
> > > On Sun, 2009-01-04 at 23:14 +0530, Vaidyanathan Srinivasan wrote:
> > > > Hi Ingo,
> > > > 
> > > > Kernbench runs on latest Linux git tree stalled with the following
> > > > lockdep warning.
> > > > 
> > > > Lockdep warning and lockup on Jan 3 Linus git tree
> > > > commit 7d3b56ba37a95f1f370f50258ed3954c304c524b
> > > > 
> > > > kernbench run with two threads stalled.  sched_mc was zero.
> > > > x86_64 system with 8 logical CPUs in dual socket quad core
> > > > configuration.
> > > > 
> > > > I will post more information as I debug this warning/bug.  
> > > 
> > > Its ca109491f612aab5c8152207631c0444f63da97f, I've some ideas on how to
> > > fix this, just haven't gotten around to actually doing anything --
> > > seeing how it was holidays and such..
> > 
> > Hi Peter,
> > 
> > I can definitely test your fix when you have them.  I have an
> > autotest job that hits this bug.
> 
> could you check latest tip/master, it has Peter's and Thomas's hrtimer 
> fixes.

Hi Ingo,

I have started a test run with the today's sched-tip.  I will report
results.

--Vaidy

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