linux-kernel - Re: Regression in v3.4-rc0 " BUG: soft lockup - CPU#0 stuck for 29s! [migration/0:6]..[<ffffffff810d3b8b>] stop_machine_cpu

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Message-ID: <1332345420.18960.495.camel@twins>
Date:	Wed, 21 Mar 2012 16:57:00 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	gregkh@...uxfoundation.org, rjw@...k.pl
Subject: Re: Regression in v3.4-rc0 " BUG: soft lockup - CPU#0 stuck for
 29s! [migration/0:6]..[<ffffffff810d3b8b>] stop_machine_cpu_stop+0x7b/0xf"

On Wed, 2012-03-21 at 11:26 -0400, Konrad Rzeszutek Wilk wrote:
> On Tue, Mar 20, 2012 at 07:53:22PM -0400, Konrad Rzeszutek Wilk wrote:
> > Seeing this in v3.4-rc0 tree and didn't see that with v3.3:
> 
> Hey Peter,
> 
> Git bisection points this to the fault of
> 5fbd036b552f633abb394a319f7c62a5c86a9cd7 " sched: Cleanup cpu_active madness"
> 
> thoughts? (also attaching the .config) 

Argh.. so when is this? boot? No that's somewhat unexpected. I have one
report of funnies during a hotplug bash that I'm looking into, but I
haven't actually been able to reproduce that report myself either.


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