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Subject: Re: 2.6.9-rc2-mm3
From: Paul Fulghum <paulkf@microgate.com>
To: James Morris <jmorris@redhat.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel <linux-kernel@vger.kernel.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
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On Fri, 2004-09-24 at 11:16, James Morris wrote:
> On Fri, 24 Sep 2004, James Morris wrote:
> 
> > I'm getting what looks like a deadlock during boot with this kernel, 
> > .config, bootlog and sysrq output attached.  Looks like it may be related 
> > to the serial/tty code?
> 
> Backing these out lets me boot again:
> 
> +tty-driver-take-4-try-2.patch
> +tty-locking-build-fix.patch
...
>  [<c026b3a4>] tty_termios_baud_rate+0x11/0x67
>  [<c027f485>] uart_get_baud_rate+0x53/0xd4
>  [<c0283af1>] serial8250_set_termios+0x8d/0x348
>  [<c027f580>] uart_change_speed+0x4a/0x64
>  [<c0280664>] uart_set_termios+0x4f/0x162
>  [<c026e94f>] change_termios+0x1b3/0x21a
>  [<c026ea40>] set_termios+0x8a/0xf9
>  [<c026ad15>] tty_ioctl+0x152/0x44f
>  [<c0169687>] sys_ioctl+0x231/0x282
>  [<c0105d09>] sysenter_past_esp+0x52/0x71

I am seeing this deadlock also.

tty_termios_lock is acquired in change_termios(), tty_ioctl.c

change_termios() calls the driver set_termios callback
which in turn calls tty_termios_baud_rate(), tty_io.c
which tries to acquire the lock again.

-- 
Paul Fulghum
paulkf@microgate.com

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