linux-kernel - Re: [BUG]: fsnotify oops on 3.5.2

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Message-ID: <20120827205706.GA18063@ymail.com>
Date:	Mon, 27 Aug 2012 15:57:08 -0500
From:	Andrew Watts <akwatts@...il.com>
To:	Guo Chao <yan@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	rostedt@...dmis.org
Subject: Re: [BUG]: fsnotify oops on 3.5.2

On Mon, Aug 27, 2012 at 01:32:01PM +0800, Guo Chao wrote:
> Problematic instruction seems to be this one:
> 
>    85 73 74             	test   %esi,0x74(%ebx)

Guo:

Thank you very much for the very detailed response on the meaning of the
oops - it was very educational for me. I did have one question, however.
How were you able to identify the relevant section in the source code?

> But have no idea how 'struct path' contained a NULL 
> 'struct vfsmount *' ... ...
> 

As Steven points out, this could be a bug in the overlayfs code. After
getting a 2nd oops last night, I rebuilt 3.5.2 w/o overlafs in order to
test that theory. Though I am unable to reproduce at will, 2 oopses in
60 hours suggests I should not have to wait too long for a verdict.

I will follow-up in a couple of days one way or the other.

~ Andy
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