linux-kernel - Re: [debug PATCHes] Re: smp_call_function

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Message-ID: <20150401145541.GA17686@gmail.com>
Date:	Wed, 1 Apr 2015 16:55:41 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Chris J Arges <chris.j.arges@...onical.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rafael David Tinoco <inaddy@...ntu.com>,
	Peter Anvin <hpa@...or.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Gema Gomez <gema.gomez-solano@...onical.com>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [debug PATCHes] Re: smp_call_function_single lockups


* Chris J Arges <chris.j.arges@...onical.com> wrote:

> > diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
> > index 6cedd7914581..79d6de6fdf0a 100644
> > --- a/arch/x86/kernel/apic/vector.c
> > +++ b/arch/x86/kernel/apic/vector.c
> > @@ -144,6 +144,8 @@ __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
> >  			cfg->move_in_progress =
> >  			   cpumask_intersects(cfg->old_domain, cpu_online_mask);
> >  			cpumask_and(cfg->domain, cfg->domain, tmp_mask);
> > +			if (cfg->move_in_progress)
> > +				dump_stack();
> >  			break;
> >  		}
> >  
> > 
> 
> Should I add the dump_stack() to the 'new-domain move' area line 
> ~184 since that's the path I seem to be triggering?

Yeah, please do, that's what I wanted to mark.

My guess is that it will show a stack dump to within set_affinity().

Thanks,

	Ingo
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