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Date: 24 Nov 2011 16:47:10 -0500
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From: "George Spelvin" <linux@horizon.com>
To: linux@horizon.com, viro@ZenIV.linux.org.uk
Subject: Re: 3.1-rc10 oops in nameidata_to_filp
Cc: jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
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Thanks for the pointer.  I'll write some debug code.

> Said that, I'm not buying the theory of open assigning to ->f_mapping and
> screwing it up; all such assignments end up with ->i_mapping of *some*
> inode, as far as I can see from cursory grep over the tree.  Just in case:
> do you have CONFIG_FS_POSIX_ACL set?

No, I always turn that off.  (And TMPFS_POSIX_ACL, too.)