linux-kernel - Re: [3.10.4] NFS locking panic, plus persisting NFS shutdown panic from 3.9.*

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Message-ID: <1375909795.7280.58.camel@leira.trondhjem.org>
Date:	Wed, 7 Aug 2013 21:09:55 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	Nix <nix@...eri.org.uk>
CC:	Jeff Layton <jlayton@...hat.com>,
	Toralf Förster <toralf.foerster@....de>,
	Oleg Nesterov <oleg@...hat.com>,
	NFS list <linux-nfs@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dhowells@...hat.com" <dhowells@...hat.com>
Subject: Re: [3.10.4] NFS locking panic, plus persisting NFS shutdown panic
 from 3.9.*

On Wed, 2013-08-07 at 22:01 +0100, Nix wrote:
> On 7 Aug 2013, Trond Myklebust said:
> 
> > On Wed, 2013-08-07 at 11:18 +0100, Nix wrote:
> >> On 6 Aug 2013, Trond Myklebust verbalised:
> >> > True. How about something like the following instead. Note the change to
> >> > the original patch...
> >> 
> >> Well, with those applied I could reboot without a panic for the first
> >> time since 3.8.x: looking good. I'll give it a reboot or two with a
> >> system that's not hot from booting though.
> >
> > Could you please also try applying only the 1/2 patch, to see if that
> > suffices to quell the shutdown panic?
> 
> It doesn't suffice. I see this severely truncated oops:
> 
> [  115.799092] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
> [  115.800284] IP: [<ffffffff81165ec6>] path_init+0x11c/0x36f
> [  115.801463] PGD 0 
> [  115.802625] Oops: 0000 [#1] PREEMPT SMP 
> [  115.803805] Modules linked in: [last unloaded: microcode] 
> [  115.804995] CPU: 3 PID: 1191 Comm: sleep Not tainted 3.10.5-05317-g3c9f6fa-dirty #2
> [  115.806207] Hardware name: System manufacturer System Product Name/P8H61-MX USB3, BIOS 0506 08/10/2012
> [  115.807453] task: ffff8804189a0000 ti: ffff8803f74d6000 task.ti: ffff8803f74d6000
> 
OK. Then I'll mark them both for stable inclusion in 3.9+.

Thanks for testing!
-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com