Re: frequent lockups in 3.18rc4

From: Dave Jones
Date: Tue Dec 02 2014 - 15:31:03 EST

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@xxxxxxxxx> 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

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