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

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Message-ID: <20141024183323.GX4977@linux.vnet.ibm.com>
Date:	Fri, 24 Oct 2014 11:33:23 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Jay Vosburgh <jay.vosburgh@...onical.com>
Cc:	Yanko Kaneti <yaneti@...lera.com>,
	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>
Subject: Re: localed stuck in recent 3.18 git in copy_net_ns?

On Fri, Oct 24, 2014 at 11:20:11AM -0700, Jay Vosburgh wrote:
> Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> >On Thu, Oct 23, 2014 at 09:48:34PM -0700, Jay Vosburgh wrote:
> >> Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> [...]
> >> >Either way, my patch assumed that 39953dfd4007 (rcu: Avoid misordering in
> >> >__call_rcu_nocb_enqueue()) would work and that 1772947bd012 (rcu: Handle
> >> >NOCB callbacks from irq-disabled idle code) would fail.  Is that the case?
> >> >If not, could you please bisect the commits between 11ed7f934cb8 (rcu:
> >> >Make nocb leader kthreads process pending callbacks after spawning)
> >> >and c847f14217d5 (rcu: Avoid misordering in nocb_leader_wait())?
> >> 
> >> 	Just a note to add that I am also reliably inducing what appears
> >> to be this issue on a current -net tree, when configuring openvswitch
> >> via script.  I am available to test patches or bisect tomorrow (Friday)
> >> US time if needed.
> >
> >Thank you, Jay!  Could you please check to see if reverting this commit
> >fixes things for you?
> >
> >35ce7f29a44a rcu: Create rcuo kthreads only for onlined CPUs
> >
> >Reverting is not a long-term fix, as this commit is itself a bug fix,
> >but would be good to check to see if you are seeing the same thing that
> >Yanko is.  ;-)
> 
> 	Just to confirm what Yanko found, reverting this commit makes
> the problem go away for me.

Thank you!

I take it that the patches that don't help Yanko also don't help you?

							Thanx, Paul

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