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: <1332347432.18960.497.camel@twins>
Date:	Wed, 21 Mar 2012 17:30:32 +0100
From:	Peter Zijlstra <peterz@...radead.org>
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 16:57 +0100, Peter Zijlstra wrote:
> 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.

is arch/x86/xen/smp.c:cpu_bringup() missing a call to
notify_cpu_starting() before doing set_cpu_online()?

Also, shouldn't that also take the ipi_call_lock() around setting the
cpu online?
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