linux-kernel - Re: smp_call_function

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Date:	Thu, 19 Feb 2015 17:16:04 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rafael David Tinoco <inaddy@...ntu.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jens Axboe <axboe@...nel.dk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Gema Gomez <gema.gomez-solano@...onical.com>,
	chris.j.arges@...onical.com
Subject: Re: smp_call_function_single lockups

On Thu, Feb 19, 2015 at 01:42:39PM -0200, Rafael David Tinoco wrote:
> Linus, Peter, Thomas
> 
> Just a quick feedback, We were able to reproduce the lockup with this
> proposed patch (3.19 + patch). Unfortunately we had problems with the
> core file and I have only the stack trace for now but I think we are
> able to reproduce it again and provide more details (sorry for the
> delay... after a reboot it took some days for us to reproduce this
> again).
> 
> It looks like RIP is still smp_call_function_single.

So Linus' patch mostly fixes smp_call_function_single_async() which is
not what you're using.

It would be very good to see traces of other CPUs; if for some reason
the target CPU doesn't get around to running your callback, then we'll
forever wait on it.

loaded_vmcs_clear() uses smp_call_function_single(.wait = 1), that
should work as before.
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