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Old 12-31-2008, 02:25 AM   #1
RattleSn@ke
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Question [SOLVED] RHEL4 Strange kernel panic on boot. Kernel Update no solution


Hi,

I have the following strange thing with a RHEL4 installation.
Since last week, the system did a reboot and now something is really fucked up. During boot we get the following messages (don't care about 'strange' typo's, my colleague typed it 'blind' from the screen)

Code:
scanning logical volumes
reading all physical volumes this may take a while
hda: packet command error:status=0x51 { Drivev Ready SeekComplete Error}
hda packet command error: error=0x54
ide failed opcode was 100
FOund volume group "Volgroup00" using metadata type lvm2
Activating logical volumes 
2 logical volumes in volume group VolGroup00" is now active
creating root device
Mounting root filesystem
kjournald starting. Commit interval 5secndes
EXT3-fs: mounted filesystem with ordered data mode
switchting to new root
Kernel panic -not syncing: Attempted to kill init!
In above: hda = cdrom
HDD is sda.

The strange thing is that we never see a 'could not mount blabla' or similar messages. First we thought it was a failing kernel update by plesk, but even after manually updating the kernel with RHN RPM's, still the same message. Booting with rescue mode and then chroot the system works. After that we even can start things like plesk and so on.

We double checked things with another RHEL4 install, and at least two things were odd:
1: the working machine has /dev/dm-0 and /dev/dm-1, the broken one doesn't
2: some files on /dev didn't have group root, but 252

We tried to recreate the /dev/dm-X nodes with [vgmknodes -v], output:
Code:
file descriptor 20 left open
file descriptor 21 left open
finding all logical volumes
fixing up missing size 148.88 gb for PV /dev/sda2
A fdisk /dev/sda shows: /dev/sda2 XX XXX XXXXX Linux LVM (I removed the numbers because this line is from another machine, but rest was identical)

We have a copy of the boot partition so if one need more info please let me know.

grub.conf:
Code:
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux ES (2.6.9-78.0.8.ELsmp)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-78.0.8.ELsmp ro root=/dev/VolGroup00/LogVol00
        initrd /initrd-2.6.9-78.0.8.ELsmp.img
last part of init extracted from initrd-2.6.9-78.0.8.ELsmp.img:
Code:
echo Making device-mapper control node
mkdmnod
echo Scanning logical volumes
lvm vgscan --ignorelockingfailure
echo Activating logical volumes
lvm vgchange -ay --ignorelockingfailure VolGroup00
echo Creating root device
mkrootdev /dev/root
umount /sys
echo Mounting root filesystem
mount -o defaults --ro -t ext3 /dev/root /sysroot
mount -t tmpfs --bind /dev /sysroot/dev
echo Switching to new root
switchroot /sysroot
umount /initrd/dev
I hope someone can give me some insight in this issue, because my ideas are depleted. Ow BTW !!:: Almost at the same time we have another machine (CentOS) in another Datacenter with the identical issue!! That's just to strange in my eyes...

And for those who are reading this today: Already have a happy newyear!

Thanks!
Onno.

Last edited by RattleSn@ke; 02-07-2009 at 03:12 AM. Reason: Problem solved.
 
Old 01-02-2009, 01:25 PM   #2
RattleSn@ke
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Registered: Oct 2007
Location: Netherlands, ZH
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Hi,

In addition to my question I discovered the following:
I installed a VM with RHEL4 to check some things out, and I discovered that the next message right after "switchting to new root" is "SELinux disabled on runtime". At least that is on a working machine. So I would say (please disagree with me if I'm wrong) that SELinux is causing the kernel to panic right?!

Hope someone can reply on this with useful info.

Thanks!
Onno.
 
Old 01-02-2009, 04:34 PM   #3
Predatorian
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Location: currently, where ever the army takes me
Distribution: Debian Lenny/Ubuntu or Arch Linux
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I am also getting the same problems with PUD linux, and antix linux on my virtualbox vm's. when i tried installing pud on my laptop, i got the kernel panic error, so i reverted back to ubuntu and did a virtual machine to see what was wrong with pud, if it didnt like my hardware or whatnot. im at a loss here too. so if anyone has any hints or answers, shoot, i'll take them.
 
Old 02-07-2009, 03:24 AM   #4
RattleSn@ke
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Registered: Oct 2007
Location: Netherlands, ZH
Posts: 32

Original Poster
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Hi,

This problem is solved. I found out by myself that the problem was caused by a faulty /sbin/init

Normally the init exec is around 40KB or more, but on all these systems it was just around 15KB (!) We really don't know what happend, we think "someone" screwed it up. After doing a reinstall of SysVinit RPM, everything started to work again.

To complete this post I'll include the commands used to force the reinstall of the SysVinit Package.

# rpm -qa |grep -i sysvinit
SysVinit-2.85-34.4

# rpm -e --nodeps SysVinit-2.85-34.4

# yum install sysvinit

That did the trick.

At least thanks for replies.
Onno.
 
  


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