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Re: 2.6.24-rc2 XFS nfsd hang / smbd too

To: Christian Kujau <lists@xxxxxxxxxxxxxxx>
Subject: Re: 2.6.24-rc2 XFS nfsd hang / smbd too
From: Chris Wedgwood <cw@xxxxxxxx>
Date: Thu, 15 Nov 2007 16:34:10 -0800
Cc: LKML <linux-kernel@xxxxxxxxxxxxxxx>, "J. Bruce Fields" <bfields@xxxxxxxxxxxx>, Benny Halevy <bhalevy@xxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <alpine.DEB.0.99999.0711150840340.12443@xxxxxxxxxxxxxxxxxx>
References: <20071114070400.GA25708@xxxxxxxxxxxxxxxxxx> <473AA72C.6020308@xxxxxxxxxxx> <20071114125907.GB4010@xxxxxxxxxxxx> <alpine.DEB.0.99999.0711142317010.12443@xxxxxxxxxxxxxxxxxx> <alpine.DEB.0.99999.0711150840340.12443@xxxxxxxxxxxxxxxxxx>
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On Thu, Nov 15, 2007 at 08:51:36AM +0100, Christian Kujau wrote:

> [<c040914c>] mutex_lock_nested+0xcc/0x2c0
> [<c016dc64>] do_lookup+0xa4/0x190
> [<c016f6f9>] __link_path_walk+0x749/0xd10
> [<c016fd04>] link_path_walk+0x44/0xc0
> [<c016fd98>] path_walk+0x18/0x20
> [<c016ff98>] do_path_lookup+0x78/0x1c0
> [<c0170998>] __user_walk_fd+0x38/0x60
> [<c0169bd1>] vfs_stat_fd+0x21/0x50
> [<c0169ca1>] vfs_stat+0x11/0x20
> [<c0169cc4>] sys_stat64+0x14/0x30
> [<c01028d6>] sysenter_past_esp+0x5f/0xa5

nfsd already wedged up and holds a lock, this is expected.

I'm not sure what you're doing here, but a viable work-around for now
might be to use nfsv2 mounts, something like

  mount -o vers=2 ...

or to keep v3 and disable readdirplus doing something like:

  mount -o vers=3,nordirplus ...

The later I didn't test but was suggested on #linuxfs.

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