linux-kernel - Re: nfsd hang and kernel bug in 2.6.35-rc3

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Message-ID: <20100616220824.4e886552@boulder.homenet>
Date:	Wed, 16 Jun 2010 22:08:24 +0100
From:	Chris Vine <chris@...ne.freeserve.co.uk>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: nfsd hang and kernel bug in 2.6.35-rc3

On Wed, 16 Jun 2010 12:35:32 -0400
Jeff Layton <jlayton@...hat.com> wrote:
[snip]
> No, I don't think we ever saw any oopses from this, but I think I can
> see what happened here:
> 
> rpc.nfsd was unable to hand any socket fd's off to the kernel due to
> being unable to start lockd. Regardless though, it tried to start
> threads anyway, and called into nfsd_init_socks. It then started a udp
> socket, and tried to call lockd_up again. That failed, and it
> returned error. Now sv_permsocks is non-empty but the socket there
> doesn't hold a lockd reference.
> 
> The right fix is probably to tear down the socket when lockd_up fails
> in nfsd_init_socks.
> 
> I suspect that Chris may be using an older version of rpc.nfsd though
> that might behave a little differently than the one I was using, and
> that might account for why he hit this and we didn't.
> 
> Chris, what version of nfs-utils do you have installed on this box?
[snip]

It's the stock nfs-utils-1.2.2 which comes with slackware 13.1, which
seems to be the latest (stable) release.

Chris


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