linux-kernel - Re: [PATCH 0/3] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"

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Date:	Tue, 16 Dec 2008 12:55:03 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	linux-nfs@...r.kernel.org, Max Kellermann <mk@...all.com>,
	linux-kernel@...r.kernel.org, gcosta@...hat.com,
	Grant Coady <grant_lkml@...o.com.au>,
	Tom Tucker <tom@...ngridcomputing.com>
Subject: Re: [PATCH 0/3] NFS regression in 2.6.26?, "task blocked for more
	than 120 seconds"

On Sun, Dec 14, 2008 at 06:24:05PM +0000, Ian Campbell wrote:
> On Sat, 2008-12-06 at 12:16 +0000, Ian Campbell wrote:
> > On Mon, 2008-12-01 at 22:09 +0000, Ian Campbell wrote:
> > > On Sun, 2008-11-30 at 19:17 -0500, Trond Myklebust wrote: 
> > > > Can you see if the following 3 patches help? They're against 2.6.28-rc6,
> > > > but afaics the problems are pretty much the same on 2.6.26.
> > > 
> > > Thanks.
> > > 
> > > The server was actually running 2.6.25.7 but the matching sources have
> > > since been removed the backports.org so I've reproduce with 2.6.26 and
> > > now I'll add the patches.
> > 
> > Just a small progress report. Anecdotally I thought that unpatched
> > 2.6.26.7 was worse than 2.6.25.7, mostly because it hung twice in the ~1
> > day I was running it where previously it was less frequent than once per
> > day.
> > 
> > With the patched server the client ran OK for 2.5 days then mysteriously
> > hung, the logs show none of the normal symptoms and my wife reset it
> > before I got home so I've no real clue what happened but I'm inclined to
> > think it was unrelated for now. I'll get back to you in a week or so if
> > the problem hasn't reoccurred.
> 
> $ uptime 
>  18:15:29 up 9 days, 22 min,  1 user,  load average: 0.74, 0.64, 0.46
> 
> This is on the problematic client, so it looks like the server side fix
> has sorted it. Thanks very much Trond.

Thanks for the testing!  So this was with the following three patches
applied on the server on top of 2.6.26?

	[PATCH 1/3] SUNRPC: Ensure the server closes sockets in a timely fashion
	[PATCH 2/3] SUNRPC: We only need to call svc_delete_xprt() once...
	[PATCH 3/3] SUNRPC: svc_xprt_enqueue should not refuse to enqueue 'XPT_DEAD' transports

I'll try to take a look at these before I leave for the holidays,
assuming the versions Trond posted on Nov. 30 are the latest.

--b.
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