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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <5677.1414174811@famine>
Date:	Fri, 24 Oct 2014 11:20:11 -0700
From:	Jay Vosburgh <jay.vosburgh@...onical.com>
To:	paulmck@...ux.vnet.ibm.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?

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.

	-J

---
	-Jay Vosburgh, jay.vosburgh@...onical.com
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/