linux-kernel - Re: Odd NFS related SIGBUS (& possible fix)

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Message-ID: <20101001171810.GC30570@fieldses.org>
Date:	Fri, 1 Oct 2010 13:18:10 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Nick Piggin <npiggin@...nel.dk>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: Odd NFS related SIGBUS (& possible fix)

On Fri, Oct 01, 2010 at 03:57:47PM +1000, Benjamin Herrenschmidt wrote:
> (Reminder: On 2.6.32.16, where we initially experienced the problem, I
> found out that we get a -lot- of invalidations coming due to server
> mtime being more recent than the local mtime, which is very very odd
> considering that the local machine is the only one to ever modify the
> files)

Possibly also related?:

	https://bugzilla.redhat.com/show_bug.cgi?id=636590

We see what seem to be cache invalidations when all we're doing is
something like

	open
	write
	close
	open
	read

from a single thread on a single client.  This happens over a variety of
protocol and server versions.

--b.
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