Bug#544155: [grub-pc] grub update renders system unbootable (unaligned pointer 0x700ba)

[Martin Steigerwald]

Am Samstag 29 August 2009 schrieben Sie:

> Am Samstag, den 29.08.2009, 11:14 +0200 schrieb Martin Steigerwald:
> > Package: grub-pc
> > Version: 1.96+20090317-1
> > Severity: grave
> >
> > --- Please enter the report below this line. ---
> > Note: This bug report is for 1.96+20090826-3, I downgraded to the
> > squeeze version to make system bootable again.
>
> If you report a bug bug for a different version then the one on
> currently running on your system, you should change the Version: pseudo
> header so that the BTS knows this too.

Ok, will do next time.

> > I just let aptitude update grub-pc to 1.96+20090826-3. I do not know
> > the earlier version, but I guess it was one version before, cause if
> > I still had the squeeze one it wouldn't have updated to the unstable
> > automatically.
> >
> > On booting up today I got:
> >
> > [Linux-bzImage, setup=0x2c00, size=0x25a070]
> > vga=792 is deprecated. Use set gfxpayload=1024x768x24,1024x768 before
> > linux command instead.
> > unaligned pointer 0x700ba
> > Aborted. Press any key to exit.Operating system not found
> >
> > I also tried with another kernel with the same result.
>
> With what kernel?

vmlinuz-2.6.29.6-tp42-toi-3.0.1-01085-gf325e4a

> > Then I booted into grml, overwrote the swap partition and recreated
> > it via mkswap in order to make sure the TuxOnIce snapshot is
> > invalidated to avoid data loss in next boot.
> >
> > Then I chrooted to my debian system after bind mounting /dev, /proc,
> > /sys to it, downgraded grub-pc to 1.96+20090317-1 from squeeze and
> > ran grub- install.
> >
> > I thought about running grub-install for the grub-pc from unstable,
> > but I read the current sid version might be broken anyway[1], thus I
> > thought I'd better downgrade to the squeeze one in order to get a
> > working system quickly again. I could try updating to the sid one
> > again, without running grub-install manually and then I run it
> > manually and see whether it fixes the issue. So you could know
> > whether its grub itself or a missing grub- install.
>
> If grub-install doestn't get run then /boot/grub still has the old grub
> and so nothing actually changed, except if grub-mkconfig generates a
> different grub.cfg.

So since something changed it means that grub-install has been run?

> > Anyway the expected result is: After an update of grub-pc package the
> > system boots up manually. Thus if a new version is incompatible to
> > the old stage 1 the upgrade process has to force a grub-install IMHO
> > or at least strongly recommend it. I don't remember seeing anything
> > about this in debconf questions. And if a new version of grub-pc
> > doesn't work on my ThinkPad T42 it shouldn´t enter testing ;)
>
> We have already a debconf prompt for running grub-install.
> If I reverse the if of the postinst correctly, then it gets shown
> if /boot/grub/stage2 or /boot/grub/menu.lst doestn't exist
> or /boot/grub/core.img exists.
> So at least if grub-install from grub2 were run once.
> Debconf prompts are by design only shown once, if you then want to see
> it again you'd need to run `dpkg-reconfigure grub-pc'.

I don't exactly get this. So I can try dpkg-reconfigure grub-pc, say it 
should run grub-install everytime grub-pc is updated and be done with it?

> > This is on an IBM ThinkPad T42.
> >
> > [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=540125#75
>
> I should have mentioned that I meant the 1.96+20090825-1 and 1.96
> +20090826-1 at that time currently in sid and not the 1.96+20090826-3.

So I should try the unstable one again?

What would be your directions?

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
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