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Date: Fri, 4 Jan 2008 09:05:42 +0800
From: Dave Young <hidave.darkstar@gmail.com>
To: Gabor Gombas <gombasg@sztaki.hu>
Message-ID: <20080104010542.GA2860@darkstar.te-china.tietoenator.com>
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	<a8e1da0712290007o168a730cw923055ad2c265d84@mail.gmail.com>
	<20080102151642.GA7273@boogie.lpds.sztaki.hu>
	<20080103131620.GA16307@boogie.lpds.sztaki.hu>
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Cc: linux-kernel@vger.kernel.org, bluez-devel@lists.sf.net
Subject: Re: [Bluez-devel] Oops involving RFCOMM and sysfs
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On Thu, Jan 03, 2008 at 02:16:21PM +0100, Gabor Gombas wrote:
> On Wed, Jan 02, 2008 at 04:16:42PM +0100, Gabor Gombas wrote:
> 
> > So the patch referenced above does not help. But I've found a very easy
> > way to trigger the bug:
> > 
> > - do a "cat /dev/zero > /dev/rfcomm0"
> > - switch the phone off
> > - switch the phone on, and the kernel oopses
> 
> FYI I also remember having oopses with 2.6.22.<something> but I do not
> have those logs anymore. Also I now booted 2.6.20.7 and it did not oops.

Could you try the patch (on 2.6.24-rc6) following and check the debug messages? 

diff -upr linux/net/bluetooth/rfcomm/tty.c linux.new/net/bluetooth/rfcomm/tty.c
--- linux/net/bluetooth/rfcomm/tty.c	2008-01-04 08:58:48.000000000 +0800
+++ linux.new/net/bluetooth/rfcomm/tty.c	2008-01-04 09:01:01.000000000 +0800
@@ -313,6 +313,7 @@ static void rfcomm_dev_del(struct rfcomm
 {
 	BT_DBG("dev %p", dev);
 
+	dump_stack();
 	set_bit(RFCOMM_TTY_RELEASED, &dev->flags);
 	rfcomm_dev_put(dev);
 }

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