Current kexec status?

Current kexec status?

[Ralf Hildebrandt]

I want to experiment with kexec and my 2.6.13-rc3 kernel. I'm able to
--load the kernel, but on --exec in /etc/init.d/reboot (I replaced the
reboot command in there), the machine freezes.

I'm using kexec-tools-1.101, are there any more patches needed?

-- 
Ralf Hildebrandt (i.A. des IT-Zentrums)         Ralf.Hildebrandt@charite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin    Fax.  +49 (0)30-450 570-962
IT-Zentrum Standort CBF                 send no mail to spamtrap@charite.de

Re: Current kexec status?

[Vivek Goyal]

On Wed, Jul 13, 2005 at 12:48:49PM +0200, Ralf Hildebrandt wrote:
> I want to experiment with kexec and my 2.6.13-rc3 kernel. I'm able to
> --load the kernel, but on --exec in /etc/init.d/reboot (I replaced the
> reboot command in there), the machine freezes.

Can you give more details like
- Which distro release you are running.
- Exactly what changes did you do to /etc/init.d/reboot and what steps
did you follow to load the kernel (command line options).
- What do you see on screen? Did the new kernel start booting at all.
- Would be nice if I can get serial console output.

> 
> I'm using kexec-tools-1.101, are there any more patches needed?
> 

For normal kexec, no. You don't need any more patches.

Thanks
Vivek

Re: Current kexec status?

[Ralf Hildebrandt]

* Vivek Goyal <vgoyal@in.ibm.com>:

> Can you give more details like
> - Which distro release you are running.

Debian unstable; since it has no kexec-tools, I built those from source.

> - Exactly what changes did you do to /etc/init.d/reboot and what steps
> did you follow to load the kernel (command line options).

/etc/init.d/reboot:
===================

echo -n "Rebooting... "
#reboot -d -f -i
/usr/local/sbin/kexec -f --exec --debug

Loading the Kernel in /etc/init.d/umountfs, before umount'ing /boot:
====================================================================

echo -n "Loading kernel for kexec()..."
/usr/local/sbin/kexec --load /vmlinuz
echo "done."

> - What do you see on screen? Did the new kernel start booting at all.

Nope, no booting. I get one line of output which I don't remember;
I'll have to retry.

> - Would be nice if I can get serial console output.

Sorry, no serial port here.

-- 
Ralf Hildebrandt (i.A. des IT-Zentrums)         Ralf.Hildebrandt@charite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin    Fax.  +49 (0)30-450 570-962
IT-Zentrum Standort CBF                 send no mail to spamtrap@charite.de

Re: Current kexec status?

[Ralf Hildebrandt]

* Ralf Hildebrandt <Ralf.Hildebrandt@charite.de>:

> Nope, no booting. I get one line of output which I don't remember;
> I'll have to retry.

Retried:
"Starting new kernel" -- and that's it!

-- 
Ralf Hildebrandt (i.A. des IT-Zentrums)         Ralf.Hildebrandt@charite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin    Fax.  +49 (0)30-450 570-962
IT-Zentrum Standort CBF                 send no mail to spamtrap@charite.de

Re: Current kexec status?

[Vivek Goyal]

On Wed, Jul 13, 2005 at 02:32:39PM +0200, Ralf Hildebrandt wrote:
> * Vivek Goyal <vgoyal@in.ibm.com>:
> 
> > Can you give more details like
> > - Which distro release you are running.
> 
> Debian unstable; since it has no kexec-tools, I built those from source.
> 
> > - Exactly what changes did you do to /etc/init.d/reboot and what steps
> > did you follow to load the kernel (command line options).
> 
> /etc/init.d/reboot:
> ===================
> 
> echo -n "Rebooting... "
> #reboot -d -f -i
> /usr/local/sbin/kexec -f --exec --debug
> 
> Loading the Kernel in /etc/init.d/umountfs, before umount'ing /boot:
> ====================================================================
> 
> echo -n "Loading kernel for kexec()..."
> /usr/local/sbin/kexec --load /vmlinuz
> echo "done."
> 

Please copy all the mails related to kexec and kdump problems to
fastboot mailing list also (fastboot@lists.osdl.org).

Instead of modifying reboot scripts, first can you try following simple 
steps from shell.

1. Load the kernel.
#kexec -l <kernel-image> --append=<boot time options>

2. Drop to run level 3 
# init 3

3. Exec into second kernel
# kexec -e


Thanks
Vivek