linux-kernel - Re: perf related lockdep bug

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Date:	Wed, 11 Nov 2015 05:29:41 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Stephane Eranian <eranian@...il.com>
Subject: Re: perf related lockdep bug

On Thu, Nov 05, 2015 at 06:04:46AM -0800, Paul E. McKenney wrote:
> On Thu, Nov 05, 2015 at 03:46:07AM +0100, Andi Kleen wrote:
> > On Wed, Nov 04, 2015 at 04:55:28PM -0800, Paul E. McKenney wrote:
> > > On Wed, Nov 04, 2015 at 09:58:36PM +0100, Andi Kleen wrote:
> > > > 
> > > > I tested my perf stress workload with the patch applied on 4.3,
> > > > unfortunately got a hang again :-/
> > > 
> > > Any diagnostics, sysrq-T output, or whatever?
> > 
> > The system was dead in the screen saver, no serial console.
> > I restarted it and may have some more information tomorrow.
> > 
> > The previous hangs were usually timeout on smp_call_function,
> > so one CPU disappeared.
> > 
> > I'll try the extra hunk you pointed out.
> 
> Thank you, looking forward to seeing what you get from this.

Just following up -- any new info on this hang?

							Thanx, Paul

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