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

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Message-ID: <54BFC979.8040107@oracle.com>
Date:	Wed, 21 Jan 2015 10:44:57 -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 01/20/2015 09:57 PM, Paul E. McKenney wrote:
>>> So RCU believes that an RCU read-side critical section that ended within
>>> > > an interrupt handler (in this case, an hrtimer) somehow got preempted.
>>> > > Which is not supposed to happen.
>>> > > 
>>> > > Do you have CONFIG_PROVE_RCU enabled?  If not, could you please enable it
>>> > > and retry?
>> > 
>> > I did have CONFIG_PROVE_RCU, and didn't see anything else besides what I pasted here.
> OK, fair enough.  I do have a stack of RCU CPU stall-warning changes on
> their way in, please see v3.19-rc1..630181c4a915 in -rcu, which is at:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> 
> These handle the problems that Dave Jones, yourself, and a few others
> located this past December.  Could you please give them a spin?

They seem to be a part of -next already, so this testing already includes them.

I seem to be getting them about once a day, anything I can add to debug it?


Thanks,
Sasha
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