linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141202171704.GA27174@linux.vnet.ibm.com>
Date:	Tue, 2 Dec 2014 09:17:04 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dâniel Fraga <fragabr@...il.com>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	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 02:58:38PM -0200, Dâniel Fraga wrote:
> On Tue, 2 Dec 2014 16:40:37 +0800
> Lai Jiangshan <laijs@...fujitsu.com> wrote:
> 
> > It is needed at lest for testing.
> > 
> > CONFIG_TREE_PREEMPT_RCU=y with CONFIG_PREEMPT=n is needed for testing too.
> > 
> > Please enable them (or enable them under CONFIG_RCU_TRACE=y)
> 
> 	Lai, sorry but I didn't understand. Do you mean both of them
> enabled? Because how can CONFIG_TREE_PREEMPT_RCU be enabled without
> CONFIG_PREEMPT ?

Hmmm...  I did misread that in my reply.  A similar Kconfig edit will
enable that, but I am even less happy about the thought of pushing that
to mainline!  ;-)

							Thanx, Paul

> 	If you mean both enabled, I already reported a call trace with
> both enabled:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=85941
> 
> 	Please see my previous answer to Linus and Paul too.
> 
> 	Regarding CONFIG_RCU_TRACE, do you mean
> "CONFIG_TREE_RCU_TRACE"? I couldn't find CONFIG_RCU_TRACE.
> 
> 	Thanks.
> 
> -- 
> Linux 3.17.0-dirty: Shuffling Zombie Juror
> http://www.youtube.com/DanielFragaBR
> http://exchangewar.info
> Bitcoin: 12H6661yoLDUZaYPdah6urZS5WiXwTAUgL
> 

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