From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+willy=40w.ods.org-S965046AbWFHXsD@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S965046AbWFHXsD (ORCPT <rfc822;willy@w.ods.org>);
	Thu, 8 Jun 2006 19:48:03 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965047AbWFHXsC
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Thu, 8 Jun 2006 19:48:02 -0400
Received: from smtp.osdl.org ([65.172.181.4]:29326 "EHLO smtp.osdl.org")
	by vger.kernel.org with ESMTP id S965046AbWFHXsA (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 8 Jun 2006 19:48:00 -0400
Date: Thu, 8 Jun 2006 16:50:40 -0700
From: Andrew Morton <akpm@osdl.org>
To: Philipp Baumann <pumuckl@i12.com>
Cc: linux-kernel@vger.kernel.org, Tejun Heo <htejun@gmail.com>,
       Jeff Garzik <jeff@garzik.org>
Subject: Re: [2.6.17-rc6-mm1] Oops during sata_promise init
Message-Id: <20060608165040.29e54147.akpm@osdl.org>
In-Reply-To: <4488A927.2070809@i12.com>
References: <4488A927.2070809@i12.com>
X-Mailer: Sylpheed version 1.0.0 (GTK+ 1.2.10; i386-vine-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
X-Mailing-List: linux-kernel@vger.kernel.org

Philipp Baumann <pumuckl@i12.com> wrote:
>
> Hi,
> 
> testing the latest mm kernel, i still get an Oops as follows:
> 
> 
> BUG: unable to handle kernel NULL pointer dereference at virtual address 
> 00000008
> printing eip:
> c0256773
> *pde  =  00000000
> Oops: 0002 xxxx
> 4K_STACKS PREEMPT
> last sysfs file:
> Modules linked in:
> CPU:    0
> EIP:    0060:[<c0256773>]    Not tainted VLI
> EFLAGS:    00010202 (2.6.17-rc6-mm1 #1)
> EIP is at pdc_sata_scr_write+0x10/0x14
> eax: 00000008  ebx: dfeb429c  ecx: 00000300  edx: 0000002
> esi: dfeb429c  edi: 00000300  ebp: 00000002  esp: dffc3e44
> ds: 007b  es: 007b  ss: 0068
> Process idle (pid: 1, threadinfo=dffc3000 task=dffc2ab0)
> Stack:  c02cb980 c024c84b dfeb429c dfeb0c78 fffb82ca dfeb429c c024e4b5 
> c0244541
>     c02e60a6 c3000000 c01ea753 c0256281 dfeb429c dfeb0c78 00000002 c024e5bc
>     dfeb0834 c0250cee dfeac408 e1493800 00000053 c02e6ef3 e0802300 c0802338
> Call Trace:
> [<c024c84b>] sata_scr_write_flush+0x24/0x37
> [<c024e4b5>] __sata_phy_reset+0x2e/0x12d
> [<c0244541>] scsi_add_host+0xc0/0x192
> [<c01ea753>] __delay+0x6/0x7
> [<c0256281>] pdc_reset_port+0x1f/0x34
> [<c024e5bc>] sata_phy_reset+0x8/0x18
> [<c0250cee>] ata_device_add+0x580/0x6b1
> [<c0256c41>] pdc_ata_init_one+0x2a9/0x3c8
> [<c01f5732>] pci_device_probe+0x40/0x5b
> [<c023f70b>] driver_probe_device+0x3b/0xaa
> [<c023f830>] __driver_attach+0x5a/0x5c
> [<c023f1c4>] bus_for_each_dev+0x3a/0x58
> [<c023f67a>] driver_attach+0x16/0x1a
> [<c023f7d6>] --driver_attach+0x0/0x5c
> [<c023ee9c>] bus_add_driver+0x6f/0x11f
> [<c01f5889>] __pci_register_driver+0x34/0x4f
> [<c010028c>] init+0x6c/0x225
> [<c02bd34e>] __kprobes_text_start+0x6/0x14
> [<c0100220>] init+0x0/0x225
> [<c0100220>] init+0x0/0x225
> [<c0101005>] kernel_thread_helper+0x5/0xb
> Code: 02 77 0a 8d 04 12 01 c0 03 41 60 8b 00 c3 8b 80 78 1f 00 00 8b 40 
> 08 8b 40 40 c3 53 89 c3 83 fa 02 77 0a 8d
> 04 12 01 c0 03 43 60 <89> 08 5b c3 55 57 56 53 83 ec 10 89 c6 9c 5d fa 
> b8 00 f0 ff ff
> EIP: [<c0256773>] pdc_sata_scr_write+0x10/0x14 SS:ESP 0068:dffc3e44

Thanks.  ap->ioaddr.scr_addr is zero in pdc_sata_scr_write().