linux-kernel - Re: rcu, sched: WARNING: CPU: 30 PID: 23771 at kernel/rcu/tree_plugin.h:337 rcu_read_unlock

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Date:	Fri, 23 Jan 2015 18:05:25 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"davej@...emonkey.org.uk >> Dave Jones" <davej@...emonkey.org.uk>
Subject: Re: rcu, sched: WARNING: CPU: 30 PID: 23771 at kernel/rcu/tree_plugin.h:337
 rcu_read_unlock_special+0x369/0x550()

On 01/23/2015 05:54 PM, Paul E. McKenney wrote:
> On Fri, Jan 23, 2015 at 04:51:52PM -0500, Sasha Levin wrote:
>> > On 01/23/2015 04:36 AM, Paul E. McKenney wrote:
>>> > > diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
>>> > > index 8669de884445..ec99dc16aa38 100644
>>> > > --- a/kernel/rcu/tree_plugin.h
>>> > > +++ b/kernel/rcu/tree_plugin.h
>>> > > @@ -322,6 +322,7 @@ void rcu_read_unlock_special(struct task_struct *t)
>>> > >  	special = t->rcu_read_unlock_special;
>>> > >  	if (special.b.need_qs) {
>>> > >  		rcu_preempt_qs();
>>> > > +		t->rcu_read_unlock_special.need_qs = false;
>> > 
>> > It didn't compile, I've used:
>> > 
>> > 		t->rcu_read_unlock_special.b.need_qs = false;
> Apologies, I should have marked it "untested".  Good show on finding
> the correct fix.
> 
> But does your fixed version help?  ;-)

I haven't seen it happening it again, but you won't get a "yes" out of me
until tomorrow evening :)


Thanks,
Sasha
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