linux-kernel - Re: smp_call_function

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Date:	Wed, 1 Apr 2015 11:10:48 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	Ingo Molnar <mingo@...nel.org>
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: smp_call_function_single lockups

On Wed, Apr 01, 2015 at 02:43:36PM +0200, Ingo Molnar wrote:

<snip> 
> Have you already tested whether the hang goes away if you remove 
> irq-affinity fiddling daemons from the system? Do you have irqbalance 
> installed or similar mechanisms?
> 
> Thanks,
> 
> 	Ingo
>

Even with irqbalance removed from the L0/L1 machines the hang still occurs.
Using the debug patch as described here:
https://lkml.org/lkml/2015/4/1/338

This results in no 'apic: vector* or 'ack_APIC*' messages being displayed.

--chris
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