Date: Sat, 14 Jan 2006 14:01:22 +0000
From: Al Viro <viro@ftp.linux.org.uk>
To: Andrew Morton <akpm@osdl.org>
Cc: "P. Christeas" <p_christ@hol.gr>, hch@lst.de, linux-kernel@vger.kernel.org,
       raven@themaw.net
Subject: Re: Regression in Autofs, 2.6.15-git
Message-ID: <20060114140122.GK27946@ftp.linux.org.uk>
References: <200601140217.56724.p_christ@hol.gr> <200601141350.31033.p_christ@hol.gr> <20060114035456.3f50b0d8.akpm@osdl.org> <200601141456.55530.p_christ@hol.gr> <20060114051737.6e49dffe.akpm@osdl.org>
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On Sat, Jan 14, 2006 at 05:17:37AM -0800, Andrew Morton wrote:
> You oopsed accessing 0x00000030, and offsetof(super_block, s_flags) is
> 0x30.  So autofs4 has passed in a dentry which has a NULL
> dentry->d_inode->i_sb and the new code didn't expect that.
 
It's not just new code...  inode->i_sb should _never_ be NULL, period.
We set it immediately after memory had been allocated by alloc_inode()
and never modify afterwards, let alone reset to NULL.
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