linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Mon, 1 Dec 2014 12:36:34 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dâniel Fraga <fragabr@...il.com>,
	Dave Jones <davej@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Mon, Dec 1, 2014 at 12:28 PM, Dâniel Fraga <fragabr@...il.com> wrote:
>
>         Hi Paul. Please, I'd like the patch, because without
> preemption, I'm unable to trigger this bug.

Ok, that's already interesting information. And yes, it would probably
be interesting to see if CONFIG_PREEMPT=y but !CONFIG_TREE_PREEMPT_RCU
then solves it too, to narrow it down to one but not the other..

DaveJ - what about your situation? The standard Fedora kernels use
CONFIG_PREEMPT_VOLUNTARY, do you have CONFIG_PREEMPT and
CONFIG_TREE_PREEMPT_RCU enabled? I think you and Sasha both saw some
RCU oddities too, no?

                    Linus
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