linux-kernel - Re: [crash] NULL pointer dereference at IP: [<ffffffff812e9ccb>] uart

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Message-ID: <20091012140646.17bce0df@lxorguk.ukuu.org.uk>
Date:	Mon, 12 Oct 2009 14:06:46 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [crash] NULL pointer dereference at IP: [<ffffffff812e9ccb>]
 uart_close+0x2a/0x1e4

> BUG: unable to handle kernel NULL pointer dereference at 0000000000000240
> IP: [<ffffffff812ea215>] uart_close+0x24/0x1e5

Very odd indeed. Can you dump the value of

	state (ie tty->driver_data)

	and if state is non NULL

	state->uart_port

in the crash case

and if state->uart_port is NULL then there is some head scratching
required 
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