linux-kernel - Re: bluetooth memory corruption (was Re: ext3-related crash in 2.6.20-rc1)

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Message-ID: <20061224234357.GA1817@elf.ucw.cz>
Date:	Mon, 25 Dec 2006 00:43:57 +0100
From:	Pavel Machek <pavel@....cz>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>, maxk@...lcomm.com,
	bluez-devel@...ts.sf.net
Subject: Re: bluetooth memory corruption (was Re: ext3-related crash in 2.6.20-rc1)

Hi!

> > > I got this nasty oops while playing with debugger. Not sure if that is
> > > related; it also might be something with bluetooth; I already know it
> > > corrupts memory during suspend, perhaps it corrupts memory in some
> > > error path?
> > 
> > Okay, I spoke too soon. bluetooth & suspend memory corruption was
> > _way_ harder to reproduce than expected. Took me 5-or-so-suspend
> > cycles... so it is probably unrelated to the previous crash.
> 
> can you try to reproduce this with 2.6.20-rc2 as well.

(reproduced in another mail).

        _urb_queue_tail(__pending_q(husb, _urb->type), _urb);
        err = usb_submit_urb(urb, GFP_ATOMIC);
        if (err) {
                BT_ERR("%s tx submit failed urb %p type %d err %d",
                                husb->hdev->name, urb, _urb->type, err);
                _urb_unlink(_urb);

                ~~~~~~~~~~~~~~~~~~
	 	 Do we need to remove urb from pending_q here?

                _urb_queue_tail(__completed_q(husb, _urb->type), _urb);
        } else
                atomic_inc(__pending_tx(husb, _urb->type));

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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