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List:       linux-nfs
Subject:    Re: nfs4 hang
From:       Trond Myklebust <trond.myklebust () fys ! uio ! no>
Date:       2010-05-27 17:55:01
Message-ID: 1274982901.20557.1.camel () heimdal ! trondhjem ! org
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On Thu, 2010-05-27 at 13:08 -0400, J. Bruce Fields wrote:
> On Mon, May 24, 2010 at 01:17:01PM -0400, Christopher Hawkins wrote:
> > Thanks Bruce, it does appear that idmapd is somehow related to this
> > issue. However, I'm stumped because it does exist on the client, along
> > with all the libraries it requires (according to ldd, anyway).
> 
> And /etc/passwd, and whatever other files it might decide it needs to
> open to do its work?
> 
> > Is
> > there an easy way to disable idmapd while still running nfs4 to
> > determine if it is causing the hang?
> 
> Not that I know of.

Why would you need to? 'Magic sysrq-trigger t' will show you if the
idmapper is deadlocked inside the NFS filesystem (as will the equivalent
'echo t >/proc/sysrq-trigger').

  Trond

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