linux-kernel - Re: perf related lockdep bug

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Message-ID: <20151105024607.GD3533@two.firstfloor.org>
Date:	Thu, 5 Nov 2015 03:46:07 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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 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.

-Andi
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