Re: 2.6.26-git0: IDE oops during boot

[Bartlomiej Zolnierkiewicz]

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@xxxxxxxxx> 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@xxxxxxxxx>
> >> 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@xxxxxxxxxxxxxx>
> > 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@xxxxxxx>
> >     Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> > 
> > 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?

> 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,
Bart
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