linux-kernel - Re: 2.6.26-git0: IDE oops during boot

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Message-ID: <47AFFF30.6070808@linux.vnet.ibm.com>
Date:	Mon, 11 Feb 2008 13:24:24 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Nish Aravamudan <nish.aravamudan@...il.com>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, ananth@...ibm.com
Subject: Re: 2.6.26-git0: IDE oops during boot

Nish Aravamudan wrote:
> On 2/7/08, Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
>> On Thursday 07 February 2008, Kamalesh Babulal wrote:
>>> Bartlomiej Zolnierkiewicz wrote:
>>>> Hi,
>>>>
>>>> On Wednesday 06 February 2008, Pavel Machek wrote:
>>>>> On Wed 2008-02-06 11:53:34, Pavel Machek wrote:
>>>>>> Hi!
>>>>>>
>>>>>> Trying to boot 2.6.25-git0 (few days old), I get
>>>>>>
>>>>>> BUG: unable to handle kernel paging request at ffff..ffb0
>>>>>> IP at init_irq+0x42e
>>>> init_irq? hmm...
>>>>
>>>>>> Call trace:
>>>>>> ide_device_add_all
>>>> this comes from ide-generic
>>>> (Generic IDE host driver)
>>>>
>>>>>> ide_generic_init
>>>>>> kernel_init
>>>>>> child_rip
>>>>>> vgacon_cursor
>>>>>> kernel_init
>>>>>> child_rip
>>>>>>
>>>>>> Excerpt from config:
>>>>>>
>>>>>> CONFIG_IDE=y
>>>>>> CONFIG_BLK_DEV_IDE=y
>>>>> Disabling CONFIG_IDE made my machine boot, as it was using libata
>>>>> anyway.
>>>> Kamalesh/Pavel:
>>>>
>>>> Could you try latest git and see if the OOPS is still there?
>>>>
>>>> [ Yeah, I'm unable to reproduce it. :( ]
>>>>
>>>> Thanks,
>>>> Bart
>>> Hi Bart,
>>>
>>> The panic is reproducible with the 2.6.24-git16 kernel, the call trace is
>>> similar to the previous one
>> Thanks, I again reviewed ide-probe.c changes but nothing seems wrong...
>>
>> Could you please bisect it down to the guilty commit?
> 
> Kamalesh, were you able to bisect this down? I just got hit by the
> same panic on a 4-way x86_64, with 2.6.24-git22.
> 
> Thanks,
> Nish

Hi Nish,

I tried bisecting and the guilty patch seems to be 

36501650ec45b1db308c3b51886044863be2d762 is first bad commit
commit 36501650ec45b1db308c3b51886044863be2d762
Author: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Date:   Fri Feb 1 23:09:31 2008 +0100

    ide: keep pointer to struct device instead of struct pci_dev in ide_hwif_t


the gdb output, also points to the changes made by the guilty patch

(gdb) p ide_device_add_all
$1 = {int (u8 *, const struct ide_port_info *)} 0xffffffff804176ac <ide_device_add_all>
(gdb) p/x 0xffffffff804176ac+0xb60
$2 = 0xffffffff8041820c
(gdb) l *0xffffffff8041820c
0xffffffff8041820c is in ide_device_add_all (drivers/ide/ide-probe.c:1249).
1244                    goto out;
1245            }
1246
1247            sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1248
1249            if (init_irq(hwif) == 0)
1250                    goto done;
1251
1252            old_irq = hwif->irq;
1253            /*
(gdb) 


(gdb) p init_irq
$1 = {int (ide_hwif_t *)} 0xffffffff8041721f <init_irq>
(gdb) p/x 0xffffffff8041721f+0x1a4
$2 = 0xffffffff804173c3
(gdb) l *0xffffffff804173c3
0xffffffff804173c3 is in init_irq (include/asm/pci.h:101).
96      /* Returns the node based on pci bus */
97      static inline int __pcibus_to_node(struct pci_bus *bus)
98      {
99              struct pci_sysdata *sd = bus->sysdata;
100
101             return sd->node;
102     }
103
104     static inline cpumask_t __pcibus_to_cpumask(struct pci_bus *bus)
105     {
(gdb) 


-- 
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.
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