linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141202223534.GA25340@linux.vnet.ibm.com>
Date:	Tue, 2 Dec 2014 14:35:34 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dâniel Fraga <fragabr@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Tue, Dec 02, 2014 at 08:18:46PM -0200, Dâniel Fraga wrote:
> On Tue, 2 Dec 2014 14:10:31 -0800
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > Thank you!!!
> 
> 	;)
> 
> > Was this as difficult to trigger as the version with the Kconfig hack
> > that used CONFIG_PREEMPT=y and CONFIG_TREE_PREEMPT_RCU=n?
> 
> 	Yes. I had to try many times until I got the call trace.
> 
> 	I'll try the bisect as Linus suggested, but if you have any
> other suggestions, just ask ;). Thanks Paul.

Sounds good to me -- getting a single commit somewhere between
3.16 and 3.17 is going to be a lot better than reasoning indirectly
from some set of RCU read-side critical sections.  ;-)

							Thanx, Paul

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