linux-kernel - Re: [Bluez-devel] Oops involving RFCOMM and sysfs

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Date:	Mon, 07 Jan 2008 17:07:38 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Dave Young <hidave.darkstar@...il.com>
CC:	Gabor Gombas <gombasg@...aki.hu>, linux-kernel@...r.kernel.org,
	bluez-devel@...ts.sf.net
Subject: Re: [Bluez-devel] Oops involving RFCOMM and sysfs

Dave Young wrote:
> 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);
>  }

Tried to reproduce the problem here but I can't persuade my laptop to
talk to my cell. :-( Gabor, can you please report what Dave Young asked?

Thanks.

-- 
tejun
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