linux-kernel - Re: 3.5.0-rc3 (approximately) oops on cifs mount

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Date:	Tue, 3 Jul 2012 15:22:03 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Steve French <smfrench@...il.com>, linux-kernel@...r.kernel.org,
	linux-cifs@...r.kernel.org
Subject: Re: 3.5.0-rc3 (approximately) oops on cifs mount

On Tue, 3 Jul 2012 11:59:02 -0700
Andy Lutomirski <luto@...capital.net> wrote:

> On Mon, Jul 2, 2012 at 5:28 PM, Andy Lutomirski <luto@...capital.net> wrote:
> > On Mon, Jul 2, 2012 at 5:21 PM, Steve French <smfrench@...il.com> wrote:
> >> Any recreation information?
> >
> > I think it was a result of trying to mount with an incorrect password,
> > which surprises me a bit.  I'll try to reproduce in a little bit.
> 
> Correction: it was not a wrong password -- I mounted with the correct
> password.  So far, I can't reproduce it.
> 
> --Andy
> 

It crashed here:

    BUG_ON(cpu >= nr_cpu_ids && cpu != WORK_CPU_UNBOUND);

Very odd. Seems almost like this must be some sort of memory
corruption. The work is initialized just a little bit before it gets
queued. The only thing I can figure is that something raced in and
clobbered the work struct beforehand.

One thing you could do -- maybe disassemble get_work_gcwq() and post
the results here? Maybe from that we can see what the "cpu" value
actually was by figuring out the register that holds it?

-- 
Jeff Layton <jlayton@...hat.com>
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