linux-kernel - Re: kdevtmpfs oops since yesterdays vfs merge

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Message-ID: <20110724235154.GO24703@ZenIV.linux.org.uk>
Date:	Mon, 25 Jul 2011 00:51:54 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: kdevtmpfs oops since yesterdays vfs merge

On Sun, Jul 24, 2011 at 07:40:29PM -0400, Dave Jones wrote:
> On Mon, Jul 25, 2011 at 12:28:12AM +0100, Al Viro wrote:
>  > On Sun, Jul 24, 2011 at 07:17:01PM -0400, Dave Jones wrote:
>  > > I see an oops in handle_create when I try to boot current tree..
>  > > 
>  > > full trace:
>  > > https://s3.amazonaws.com/twitpic/photos/large/355006460.jpg?AWSAccessKeyId=AKIAJF3XCCKACR3QDMOA&Expires=1311550232&Signature=IIO%2Bya1uEDJzSXTD0DXh2%2BdZpoU%3D
>  > 
>  > Where in handle_create() is that?  At least dump objdump -d of your
>  > devtmpfs.o someplace readable...
> 
> http://codemonkey.org.uk/devtmpfs.s

Smells like req->dev somehow managing to be NULL at that point, but that
doesn't make any sense - we get to devtmpfs_create_node() only from one
place, it sets req.dev to the argument it got from callers and that caller
would have oopsed itself before getting to that call with dev == NULL...

Could you stick a BUG_ON(!dev) in the beginning of handle_create() to see
if that's what somehow manages to happen?
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