From: Trond Myklebust <trond.myklebust@fys.uio.no>
To: Leif Nixon <nixon@nsc.liu.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Cache invalidation bug in NFS v3 - trivially reproducible
Date: Tue, 11 Oct 2005 10:47:57 -0400 [thread overview]
Message-ID: <1129042077.11164.9.camel@lade.trondhjem.org> (raw)
In-Reply-To: <m33bn8bet4.fsf@nammatj.nsc.liu.se>
ty den 11.10.2005 Klokka 11:09 (+0200) skreiv Leif Nixon:
> Hi,
>
> We have come across a bug where a NFS v3 client fails to invalidate
> its data cache for a file even though it realizes that the file
> attributes have changed. We have been able to recreate the bug on a
> range of kernel versions and different underlying file systems.
>
> Here's a minimal way to reproduce the error (there seems to be some
> timing issues involved, but this has worked at least 90% of the time):
>
> NFS client n1 NFS client n2
>
> $ echo 1 > f
> $ cat f
> 1
> $ touch .
> $ echo 2 > f
> $ touch f
> $ cat f
> 1
>
> Now client n2 is stuck in a state where it uses its old cached data
> forever (or at least for several hours):
Yep. I can see a problem whereby the cache is "losing" consistency
information when you do this sort of thing. I'm working on a fix.
Cheers,
Trond
next prev parent reply other threads:[~2005-10-11 14:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-11 9:09 Leif Nixon
2005-10-11 9:22 ` Jakob Oestergaard
2005-10-11 14:47 ` Trond Myklebust [this message]
2005-10-12 4:31 ` Willy Tarreau
2005-10-13 22:34 ` Trond Myklebust
2005-10-14 13:34 ` Leif Nixon
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