Re: [Bug #14487] PANIC: early exception 08 rip 246:10 error ffffffff810251b5cr2 0

[Justin P. Mattock]

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@xxxxxxxxx>
> > > 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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