linux-kernel - Re: localed stuck in recent 3.18 git in copy_net

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Date:	Fri, 24 Oct 2014 20:09:31 +0300
From:	Yanko Kaneti <yaneti@...lera.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Cong Wang <cwang@...pensource.com>,
	Kevin Fenzi <kevin@...ye.com>, netdev <netdev@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	jay.vosburgh@...onical.com, mroos@...ux.ee
Subject: Re: localed stuck in recent 3.18 git in copy_net_ns?

On Fri-10/24/14-2014 09:54, Paul E. McKenney wrote:
> On Fri, Oct 24, 2014 at 07:29:43PM +0300, Yanko Kaneti wrote:
> > On Fri-10/24/14-2014 08:40, Paul E. McKenney wrote:
> > > On Fri, Oct 24, 2014 at 12:08:57PM +0300, Yanko Kaneti wrote:
> > > > On Thu-10/23/14-2014 15:04, Paul E. McKenney wrote:
> > > > > On Fri, Oct 24, 2014 at 12:45:40AM +0300, Yanko Kaneti wrote:
> > > > > > 
> > > > > > On Thu, 2014-10-23 at 13:05 -0700, Paul E. McKenney wrote:
> > > > > > > On Thu, Oct 23, 2014 at 10:51:59PM +0300, Yanko Kaneti wrote:
> 
> [ . . . ]
> 
> > > > Ok, unless I've messsed up something major, bisecting points to:
> > > > 
> > > > 35ce7f29a44a rcu: Create rcuo kthreads only for onlined CPUs
> > > > 
> > > > Makes any sense ?
> > > 
> > > Good question.  ;-)
> > > 
> > > Are any of your online CPUs missing rcuo kthreads?  There should be
> > > kthreads named rcuos/0, rcuos/1, rcuos/2, and so on for each online CPU.
> > 
> > Its a Phenom II X6. With 3.17 and linux-tip with 35ce7f29a44a reverted, the rcuos are 8
> > and the modprobe ppp_generic testcase reliably works, libvirt also manages
> > to setup its bridge.
> > 
> > Just with linux-tip , the rcuos are 6 but the failure is as reliable as
> > before.

 
> Thank you, very interesting.  Which 6 of the rcuos are present?

Well, the rcuos are 0 to 5. Which sounds right for a 6 core CPU like this   
Phenom II.

 
> > Awating instructions: :)
> 
> Well, I thought I understood the problem until you found that only 6 of
> the expected 8 rcuos are present with linux-tip without the revert.  ;-)
> 
> I am putting together a patch for the part of the problem that I think
> I understand, of course, but it would help a lot to know which two of
> the rcuos are missing.  ;-)
>

Ready to test

--Yanko
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