linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141202203044.GA26482@redhat.com>
Date:	Tue, 2 Dec 2014 15:30:44 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"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 01, 2014 at 12:36:34PM -0800, Linus Torvalds wrote:
 > 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..

That combination doesn't seem possible. TREE_PREEMPT_RCU is the only
possible choice if PREEMPT=y

	Dave
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