RE: debian hangs after grub
> On Wed, 27 Apr 2011 15:00:40 +0300 <ibob17@yahoo.gr> wrote:
>
> >On 04/26/2011 05:29 PM, Vangelis Katsikaros wrote:
> > Hello
> >
> > I just installed debian 6.0.1.a amd64 with net install, with a clean
> > install (before I had 5).
> >
> > The system goes to grub and when I select the non-recovery mode
> > (2.6.32-5-amd64), I get a cursor that doesn't blink and no action at
> > all. I waited about 5-6 mins (I thought it would be checking for a card
> > or something else) but nothing happened. Ctrl+Alt+Del doesn't work.
> >
> > Now, if I turn off and on the machine and:
> > - go to grub
> > - boot the recovery mode, and then at the root prompt I do a reboot
> > - go to grub
> > - boot the non recovery mode everything works fine and I get X and
> > everything.
> >
> > I wonder how I can find what happens.
> >
> > I have
> > - an lshw (from the debian 5 installation that's not there anymore) for
> > this machine http://pastebin.com/n7J8DWYZ
> > - the dmesg from the recovery mode is http://pastebin.com/UmtkYR5x
> >
> > If you need any more info I can make it available.
> >
> > Vangelis
> >
> > PS the netinstall CD could not install with the simple installer or the
> > graphical one (again it hanged after selecting the install option) , so
> > I did the installation with expert install.
> >
> >
>
> Hi again
>
> I also installed an ubuntu on the same machine, the ubuntu works fine,
> the debian issue still remains. So, I started playing with editing grub
> commands.
>
> In the debian non-recovery mode I removed from the grub command
> linux /vmlinuz... root=... ro quiet
> the "quiet" part
>
> And then booting works fine. Does that make any sense?
>
> Vangelis
>
> PS In order to apply this change permanently I edited the
> /etc/default/grub from
> GRUB_CMDLINE_LINUX_DEFAULT="quiet"
> to
> GRUB_CMDLINE_LINUX_DEFAULT=""
>
> in the ubuntu (since it was the last to be installed)
>
Just a day or so ago I found a strange behaviour around kernel boot parmeters in Debian as well.
A little digression:
I have two computers (1x home server & 1x notebook) both running Debian Squeeze. One day I must have added panic=30 to both grub boot-loader configs and ran the update-grub command after on both. My laptop was restarted many times and booted flawlessly with the new change so I felt comfortable with leaving the 'panic' parameter on the home server as well. When I eventually got around to rebooting the server, it seemed that all of a sudden the home server stopped booting completely and just hung without any real kernel errors/messages being printed to the screen. Not initially thinking about the kernel parameter change made, I ran e2fsck the linux partitions, and even installed the 2.6.38-2 kernel from wheezy booting the system with the recovery entries from the grub boot menu that did not contain the panic option. Lastly I removed the panic=30 kernel parameter all together from the grub configuration and the server started booting again like normal.
Conclusion:
I came to learn about the 'panic' option after reading the kernel-parameters.txt file from the Linux kernel documentation [1]. I see that the quiet option is also a KNL (or kernel start-up parameter. I figured these options should just work and well it seems it does on some installations but not other :S
That's wierd I must admit... perhaps you could added the panic=30 parameter to your boot entry as a test just to see if it hangs in the same place as it did with the quiet parameter.
KNL Is a kernel start-up parameter.
quiet [KNL] Disable most log messages
panic= [KNL] Kernel behaviour on panic: delay <timeout>
seconds before rebooting
Format: <timeout>
[1] - http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=blob_plain;f=Documentation/kernel-parameters.txt;hb=HEAD
-M
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