Re: initrd, reboot makes kernel panic

[debian-user@niklas.hoglund.pp.se]

Ignore my last mail.



Ironic, 2 days troubleshooting and 2h after mailing this list and the 
problem solves. ;)


FYI, according to Documentation/initrd.txt you should(?) have a pivot_root 
and a chroot in your /linuxrc (initrd-image). This is not so, works better 
without them. The kernel already knows where to mount '/' (pivot_root not 
needed) and it knows which 'init' to load (chroot not needed). Mounts root 
and starts init automatically.

//N

On Thu, 18 Aug 2005 debian-user@niklas.hoglund.pp.se wrote:

> From: debian-user@niklas.hoglund.pp.se
> Subject: initrd, reboot makes kernel panic
> Cc: debian-user@lists.debian.org
>
> Hi!
>
>
> Some background...
> I've got an IDE-raid card (Promise SX6000) which is causing some problems 
> when I reboot my linux. As the kernel does not support this card (and promise 
> only support 2.4 kernel modules) I've got an 2.4.31 kernel and an initrd 
> loading the promise module (pti_st.o). And this works fine. It boots up, 
> mounts the ide-raid as '/' and works pretty good.
>
>
>
> The problem is when I reboot my system, init jumps into runlevel 6 and starts 
> executing all the /etc/rc6.d things. When it gets to the last it prints:
>
> Kernel panic: VFS: Unable to mount root fs on 08:02
>
>
> Very strange that it tries to _mount_ something when it should reboot...
> I've looked in /etc/rc6.d and I dont see anyting there about mounting.
>
>
> I've been testing different things in /linuxrc-script but cant figure this 
> one out, really strange. If I instead if 'init' run 'sh' in /linuxrc I get 
> the 'sh' prompt and from there I can do 'reboot' without any complaints - so 
> it should be something with 'init' ...
>
>
> Any ideas greatfully accepted (including troubleshooting ideas) =)
>
>
> My linuxrc script is basically:
> PATH=.:/bin:/sbin
> export PATH
> insmod -k /modules/pti_st.o
> mount -o ro /dev/sda2 /mnt/root       # ro/rw makes no diff
> umount /proc 2> /dev/null || error "unmounting proc filesystem failed"
> cd /mnt/root
> pivot_root . initrd || error "changing to new root failed"
> #exec /usr/sbin/chroot . /sbin/init 2    # does not work, compl. /dev/initctl
> #exec /usr/sbin/chroot . /sbin/init -i
> #exec /usr/sbin/chroot . /bin/sh -c '/bin/umount /initrd; exec /sbin/init -i' 
> <dev/console >dev/console 2>&1
> exec /usr/sbin/chroot . /bin/sh <dev/console >dev/console 2>&1
> #umount /initrd
>
>
>
> //Niklas