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

Dave Young
2008-01-04T01:02:19Z

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);
}