linux-kernel - Re: [Patch] sunrpc: NULL utsname dereference on NFS umount during namespace cleanup

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Date:	Sat, 31 Jan 2015 00:44:18 +0000
From:	Nix <nix@...eri.org.uk>
To:	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	Bruno Prémont <bonbons@...ux-vserver.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: [Patch] sunrpc: NULL utsname dereference on NFS umount during namespace cleanup

On 30 Jan 2015, Trond Myklebust uttered the following:

> On Sun, 2015-01-25 at 16:55 -0500, Trond Myklebust wrote:
>> On Sun, Jan 25, 2015 at 4:06 PM, Bruno Prémont
>> <bonbons@...ux-vserver.org> wrote:
>> > On a system running home-brown container (mntns, utsns, pidns, netns)
>> > with NFS mount-point bind-mounted into the container I hit the following
>> > trace if nfs filesystem is first umount()ed in init ns and then later
>> > umounted from container when the container exists.

I'm not using containers, but I *am* extensively bind-mounting
NFS filesystems, which probably has the same net effect.

> I was rather hoping that Bruno would fix up his patch and resend, but
> since other reports of the same bug are now surfacing... Please could
> you all check if something like the following patch fixes it.

I have to wait for another of those xprt != 0 warnings, I think. I've
had a couple of clean reboots, but I had the occasional clean reboot
even before this patch.

I'll let it run overnight and give it a reboot in the morning.

-- 
NULL && (void)
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