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Message-ID: <47B40DF2.10009@linux.vnet.ibm.com>
Date: Thu, 14 Feb 2008 15:16:26 +0530
From: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
CC: Nish Aravamudan <nish.aravamudan@...il.com>,
Pavel Machek <pavel@....cz>,
kernel list <linux-kernel@...r.kernel.org>,
linux-ide@...r.kernel.org, ananth@...ibm.com,
Andi Kleen <andi@...stfloor.org>
Subject: Re: 2.6.26-git0: IDE oops during boot
Bartlomiej Zolnierkiewicz wrote:
> Hi,
>
> On Tuesday 12 February 2008, Kamalesh Babulal wrote:
>> Bartlomiej Zolnierkiewicz wrote:
>>> Hi,
>>>
>>> On Monday 11 February 2008, Kamalesh Babulal wrote:
>>>> 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 for the detailed analysis and sorry for the bug.
>>>
>>> I think that this may has been just fixed by Andi's recent hwif_to_node()
>>> fix (patch below, it is in Linus' tree already), could please verify this?
>>>
>>> commit 1f07e988290fc45932f5028c9e2a862c37a57336
>>> Author: Andi Kleen <andi@...stfloor.org>
>>> Date: Mon Feb 11 01:35:20 2008 +0100
>>>
>>> Prevent IDE boot ops on NUMA system
>>>
>>> Without this patch a Opteron test system here oopses at boot with
>>> current git.
>>>
>>> Calling to_pci_dev() on a NULL pointer gives a negative value so the
>>> following NULL pointer check never triggers and then an illegal address
>>> is referenced. Check the unadjusted original device pointer for NULL
>>> instead.
>>>
>>> Signed-off-by: Andi Kleen <ak@...e.de>
>>> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
>>>
>>> diff --git a/include/linux/ide.h b/include/linux/ide.h
>>> index 23fad89..a3b69c1 100644
>>> --- a/include/linux/ide.h
>>> +++ b/include/linux/ide.h
>>> @@ -1295,7 +1295,7 @@ static inline void ide_dump_identify(u8 *id)
>>> static inline int hwif_to_node(ide_hwif_t *hwif)
>>> {
>>> struct pci_dev *dev = to_pci_dev(hwif->dev);
>>> - return dev ? pcibus_to_node(dev->bus) : -1;
>>> + return hwif->dev ? pcibus_to_node(dev->bus) : -1;
>>> }
>>>
>>> static inline ide_drive_t *ide_get_paired_drive(ide_drive_t *drive)
>> Hi Bart,
>> Thanks !! the patch solves the kernel panic but when after applying the patch,kernel is not
>> able to mount the filesystem and panics, am i not sure what is likely causing the panic.
>
> Is
>
> - the commit 36501650ec45b1db308c3b51886044863be2d762 with Andi's fix applied
>
> or
>
> - the commit f6fb786d6dcdd7d730e4fba620b071796f487e1b
> (the one before commit 36501650ec45b1db308c3b51886044863be2d762)
>
> working for you?
No, the commit before the commit 36501650ec45b1db308c3b51886044863be2d762 did not either work, i
get the same kernel panic.
>
>> Creating root device.
>> Mounting root filesystem.
>> mount: could not find filesystem
>> Kernel panic - not syncing: Attempted to kill init!
>
> Is IDE actually used for the boot device?
>
> [ Please send a dmesg output from the working system. ]
>
--
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.
View attachment "dmesg_feb_14" of type "text/plain" (19298 bytes)
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