linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <547df3e5.725e8c0a.6716.2828@mx.google.com>
Date:	Tue, 2 Dec 2014 15:16:17 -0200
From:	Dâniel Fraga <fragabr@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 Tue, 2 Dec 2014 09:08:53 -0800
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> So just to verify:
> 
> Without CONFIG_PREEMPT, things work well for you?

	Yes.

> But with CONFIG_PREEMPT, you are able to create the rcu_sched stalls
> both with and without CONFIG_TREE_PREEMPT_RCU?
> 
> Correct?

	Yes, correct. And without CONFIG_TREE_PREEMPT_RCU it's
much harder to trigger the bug.

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