linux-kernel - Re: nfs3 problem with -rc{2,3} : blame

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Message-ID: <20120619165520.GA11015@milliways>
Date:	Tue, 19 Jun 2012 17:55:20 +0100
From:	Ken Moffat <zarniwhoop@...world.com>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: nfs3 problem with -rc{2,3} : blame

On Tue, Jun 19, 2012 at 04:23:23PM +0000, Myklebust, Trond wrote:
> On Tue, 2012-06-19 at 12:20 -0400, Trond Myklebust wrote:
> > 
> > However you are saying that the problem is there when you compile a
> > kernel with this commit as the head, and it goes away when you compile a
> > kernel with commit 3e9e0ca3f19e911ce13c2e6c9858fcb41a37496c as the head?
> > 
 Provided I apply 4f97615d as well, so that it compiles, yes.

> > I'm confused as to how a bug in that patch could depend on
> > CONFIG_NFS_V4, but I'll see what I can find.

 Thanks
> 
> By the way, I thought your test-case was doing firefox downloads. Do
> those really use O_DIRECT?
> 
 I originally saw the problem doing that, but it was on the second
download.  Or perhaps third or fourth - I tend not to remember
successful downloads when I've got a lot of packages to check for new
versions.  Using my backup script seemed a more reliable way to
trigger a problem (but, only if there is something substantial to
back up, such as a new vmlinuz).

 Thinking about this, it is almost certain that between the first
download and the one that failed (several hours later) my backup
script did run, from fcron, so I now think the rsync problem is what
leads to issues when other programs later try to update the same nfs
directory.

ĸen
-- 
das eine Mal als Tragödie, das andere Mal als Farce
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