linux-kernel - Re: [Bug #14487] PANIC: early exception 08 rip 246:10 error ffffffff810251b5 cr2 0

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Date:	Mon, 01 Feb 2010 09:57:26 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Dan Carpenter <error27@...il.com>,
	linux1394-devel@...ts.sourceforge.net,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Stefan Richter <stefanr@...6.in-berlin.de>
Subject: Re: [Bug #14487] PANIC: early exception 08 rip 246:10 error	ffffffff810251b5
 cr2 0

On 02/01/10 04:54, Dan Carpenter wrote:
> On Sun, Jan 31, 2010 at 05:39:22PM -0800, Justin P. Mattock wrote:
>> On 01/31/10 16:43, Rafael J. Wysocki wrote:
>>> This message has been generated automatically as a part of a report
>>> of regressions introduced between 2.6.31 and 2.6.32.
>>>
>>> The following bug entry is on the current list of known regressions
>>> introduced between 2.6.31 and 2.6.32.  Please verify if it still should
>>> be listed and let me know (either way).
>>>
>>>
>>> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14487
>>> Subject		: PANIC: early exception 08 rip 246:10 error ffffffff810251b5 cr2 0
>>> Submitter	: Justin P. Mattock<justinmattock@...il.com>
>>> Date		: 2009-10-23 16:45 (101 days old)
>>> References	: http://lkml.org/lkml/2009/10/23/252
>>>
>>>
>>>
>>
>>
>> yeah still hitting this.
>> looking at the issue if I change:
>>
>> @@ 260
>>
>> if ((class == 0xffffffff))
>> 	continue;
>> to
>>
>> if ((class == 0xffffffff || 0xffffffffffffffff))
>> 	continue;
>>
>
> Uh... 0xffffffffffffffff is always true so basically that's the same as deleting the
> if condition.
>
> I've added the linux1394-devel people to the CC list.
>
> Justin has found an issue that when he boots with:  ohci1394_dma=early his computer
> crashes.
>
> He can get it to boot by modifying drivers/ieee1394/init_ohci1394_dma.c:
>
> init_ohci1394_dma_on_all_controllers()
>     254          /* Poor man's PCI discovery, the only thing we can do at early boot */
>     255          for (num = 0; num<  32; num++) {
>     256                  for (slot = 0; slot<  32; slot++) {
>     257                          for (func = 0; func<  8; func++) {
>     258                                  u32 class = read_pci_config(num,slot,func,
>     259                                                          PCI_CLASS_REVISION);
>     260                                  if ((class == 0xffffffff))
>     261                                          continue; /* No device at this func */
>
> 	If he continues here then his system boots.
>
>     262
>     263                                  if (class>>8 != PCI_CLASS_SERIAL_FIREWIRE_OHCI)
>     264                                          continue; /* Not an OHCI-1394 device */
>     265
>     266                                  init_ohci1394_controller(num, slot, func);
>     267                                  break; /* Assume one controller per device */
>
> 	This comment is not terribly clear btw.  The code assumes one controller per slot.
>
>     268                          }
>     269                  }
>     270          }
>
> regards,
> dan carpenter
>
>
>> I'm able to boot, but don't have enough knowledge to know
>> what is really happening(or how to execute this).
>> will continue looking at this
>> (hopefully I get somewhere on this);
>>
>> Justin P. Mattock
>> --
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>

yeah I'll admit it, I don't know what I'm doing
(but am willing to try).

Thanks for the response, I'll try and
give as much info on this as possible.

Justin P. Mattock
--
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