linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141201191431.GA17385@linux.vnet.ibm.com>
Date:	Mon, 1 Dec 2014 11:14:31 -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 Sun, Nov 30, 2014 at 11:02:43PM -0200, Dâniel Fraga wrote:
> On Sun, 30 Nov 2014 16:21:19 -0800
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > Maybe you'll have to turn off RCU_CPU_STALL_VERBOSE first.
> > 
> > Although I think you should be able to just edit the .config file,
> > delete the like that says
> > 
> >     CONFIG_TREE_PREEMPT_RCU=y
> > 
> > and then just do a "make oldconfig", and then verify that
> > TREE_PREEMPT_RCU hasn't been re-enabled by some dependency. But it
> > shouldn't have, and that "make oldconfig" should get rid of anything
> > that depends on TREE_PREEMPT_RCU.
> 	
> 	Ok, I did exactly that, but CONFIG_TREE_PREEMPT_RCU is
> re-enabled. I talked with Pranith Kumar and he suggested I could just
> disable preemption (No Forced Preemption (Server)) and that's the only
> way to disable CONFIG_TREE_PREEMPT_RCU.

If it would help to have !CONFIG_TREE_PREEMPT_RCU with CONFIG_PREEMPT=y,
please let me know and I will create a patch that forces this.
(Not mainline material, but if it helps with debug...)

							Thanx, Paul

> 	Now I'll try to make the system freeze, then I'll send
> you the Call trace.
> 
> 	Thanks.
> 
> -- 
> Linux 3.17.0: Shuffling Zombie Juror
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