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Guy Boisvert 07-01-2010 09:25 PM

Superblock Problem
 
Hi all,

After rebooting my CentOS 5.5 server, i have the following message:

==================================
Red Hat nash version 5.1.19.6 starting
EXT3-fs: unable to read superblock
mount: error mounting /dev/root on /sysroot as ext3: invalid argument
setuproot: moving /root failed: No such file or directory
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
switchroot: mount failed: no such file or directory
Kernel panic - not syncing: Attempted to kill init!


I booted the server (rescue mode) with CentOS 5.4 x64 i have used to
initially install it. It recognizes all the RAID1 partitions i have.

cat /mnt/sysimage/proc/mdstat
============================
md3 : active raid1 sdb2[1] sda2[0]
2048192 blocks [2/2] [UU]

md1 : active raid1 sdb3[1] sda3[0]
486134848 blocks [2/2] [UU]

md0 : active raid1 sdb1[0] sda1[1]
200704 blocks [2/2] [UU]

unused devices: <none>


cat /mnt/sysimage/boot/grub/menu.lst
===================================
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/md1
# initrd /initrd-version.img
#boot=/dev/md0
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-164.10.1.el5xen)
root (hd0,0)
kernel /xen.gz-2.6.18-164.10.1.el5
module /vmlinuz-2.6.18-164.10.1.el5xen ro root=/dev/md1 rhgb quiet
module /initrd-2.6.18-164.10.1.el5xen.img
title CentOS (2.6.18-164.10.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-164.10.1.el5 ro root=/dev/md1 rhgb quiet
initrd /initrd-2.6.18-164.10.1.el5.img
title CentOS (2.6.18-164.6.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-164.6.1.el5 ro root=/dev/md1 rhgb quiet
initrd /initrd-2.6.18-164.6.1.el5.img
title CentOS (2.6.18-164.6.1.el5xen)
root (hd0,0)
kernel /xen.gz-2.6.18-164.6.1.el5
module /vmlinuz-2.6.18-164.6.1.el5xen ro root=/dev/md1 rhgb quiet
module /initrd-2.6.18-164.6.1.el5xen.img
title CentOS (2.6.18-164.el5xen)
root (hd0,0)
kernel /xen.gz-2.6.18-164.el5
module /vmlinuz-2.6.18-164.el5xen ro root=/dev/md1 rhgb quiet
module /initrd-2.6.18-164.el5xen.img
title CentOS-base (2.6.18-164.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/md1 rhgb quiet
initrd /initrd-2.6.18-164.el5.img



./getinfo.sh disk
==============
== BEGIN uname -rmi ==
2.6.18-164.el5 x86_64 x86_64
== END uname -rmi ==

== BEGIN rpm -q centos-release ==
centos-release-5-5.el5.centos
== END rpm -q centos-release ==

== BEGIN getenforce ==
Permissive
== END getenforce ==

== BEGIN cat /etc/fstab ==
/dev/md1 / ext3 defaults,acl 1 1
/dev/md0 /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/md3 swap swap defaults 0 0
== END cat /etc/fstab ==

== BEGIN df -h ==
Filesystem Size Used Avail Use% Mounted on
/dev/md1 450G 72G 355G 17% /
/dev/md0 190M 45M 136M 25% /boot
== END df -h ==

== BEGIN fdisk -l ==
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md1 doesn't contain a valid partition table
Disk /dev/md3 doesn't contain a valid partition table

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 fd Linux raid
autodetect
/dev/sda2 26 280 2048287+ fd Linux raid
autodetect
/dev/sda3 281 60801 486134932+ fd Linux raid
autodetect

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 25 200781 fd Linux raid
autodetect
/dev/sdb2 26 280 2048287+ fd Linux raid
autodetect
/dev/sdb3 281 60801 486134932+ fd Linux raid
autodetect

Disk /dev/md0: 205 MB, 205520896 bytes
2 heads, 4 sectors/track, 50176 cylinders
Units = cylinders of 8 * 512 = 4096 bytes


Disk /dev/md1: 497.8 GB, 497802084352 bytes
2 heads, 4 sectors/track, 121533712 cylinders
Units = cylinders of 8 * 512 = 4096 bytes


Disk /dev/md3: 2097 MB, 2097348608 bytes
2 heads, 4 sectors/track, 512048 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

== END fdisk -l ==

== BEGIN blkid ==
/dev/md3: TYPE="swap"
/dev/md0: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3"
/dev/md1: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3"
/dev/sdb3: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3"
/dev/sdb2: TYPE="swap"
/dev/sdb1: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3"
/dev/sda3: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3"
/dev/sda2: TYPE="swap"
/dev/sda1: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3"
== END blkid ==


Tried to boot from different kernels, same result. I searched Google
and read something about superblock being "repeted" to many places on
the filesystem but didn't tried anything because of bad explanations and
fear of srewing up the partition.

I already backed up the important stuff to another server. I'd like to
know if it's possible to fix that problem quickly, if not i'll
re-install it. But i'd like to know the fix anyway so if it appends
again, would know what to do!

Thanks!

Guy Boisvert
IngTegration inc.


--
Guy Boisvert, ing.
IngTegration inc.
http://www.ingtegration.com

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07-01-2010 09:32 PM

Superblock Problem
 
Guy Boisvert wrote:
> Hi all,
>
> After rebooting my CentOS 5.5 server, i have the following message:
>
> ==================================
> Red Hat nash version 5.1.19.6 starting
> EXT3-fs: unable to read superblock
> mount: error mounting /dev/root on /sysroot as ext3: invalid argument
> setuproot: moving /root failed: No such file or directory
> setuproot: error mounting /proc: No such file or directory
> setuproot: error mounting /sys: No such file or directory
> switchroot: mount failed: no such file or directory
> Kernel panic - not syncing: Attempted to kill init!
>
>
> I booted the server (rescue mode) with CentOS 5.4 x64 i have used to
> initially install it. It recognizes all the RAID1 partitions i have.
>
> cat /mnt/sysimage/proc/mdstat
> ============================
> md3 : active raid1 sdb2[1] sda2[0]
> 2048192 blocks [2/2] [UU]
>
> md1 : active raid1 sdb3[1] sda3[0]
> 486134848 blocks [2/2] [UU]
>
> md0 : active raid1 sdb1[0] sda1[1]
> 200704 blocks [2/2] [UU]
>
> unused devices: <none>
>
>
> cat /mnt/sysimage/boot/grub/menu.lst
> ===================================
> # grub.conf generated by anaconda
> #
> # Note that you do not have to rerun grub after making changes to this
> file
> # NOTICE: You have a /boot partition. This means that
> # all kernel and initrd paths are relative to /boot/, eg.
> # root (hd0,0)
> # kernel /vmlinuz-version ro root=/dev/md1
> # initrd /initrd-version.img
> #boot=/dev/md0
> default=0
> timeout=5
> splashimage=(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title CentOS (2.6.18-164.10.1.el5xen)
> root (hd0,0)
> kernel /xen.gz-2.6.18-164.10.1.el5
> module /vmlinuz-2.6.18-164.10.1.el5xen ro root=/dev/md1 rhgb
> quiet
> module /initrd-2.6.18-164.10.1.el5xen.img
> title CentOS (2.6.18-164.10.1.el5)
> root (hd0,0)
> kernel /vmlinuz-2.6.18-164.10.1.el5 ro root=/dev/md1 rhgb quiet
> initrd /initrd-2.6.18-164.10.1.el5.img
<snip>
First, have you tried booting with the second one, or do you require xen?

Second, I find it odd, since the kernel I have with 5.5 is
2.6.18-194.3.1.el5 (well, the initial install gave me 2.6.18-194.el5, but
this was the first upgrade).

Finally, it's almost as though grub were not correctly installed - have
you checked /boot/grub/device.map?

mark


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Morten Torstensen 07-02-2010 11:18 AM

Superblock Problem
 
On 01.07.2010 23:32, m.roth@5-cent.us wrote:
>> mount: error mounting /dev/root on /sysroot as ext3: invalid argument
>> setuproot: moving /root failed: No such file or directory
>> setuproot: error mounting /proc: No such file or directory
>> setuproot: error mounting /sys: No such file or directory
>> switchroot: mount failed: no such file or directory
>> Kernel panic - not syncing: Attempted to kill init!
> Second, I find it odd, since the kernel I have with 5.5 is
> 2.6.18-194.3.1.el5 (well, the initial install gave me 2.6.18-194.el5, but
> this was the first upgrade).

I see the same on a CentOS 5.5 system here, but I only see it with the
2.6.18-194.3.1.el5 kernel. The older -164 kernels work fine.

The system was updated to 5.5 from 5.4. LVM, filesystems and grub should
be ok, as -164 boots ok. Only -194 has the problem.

--
//Morten
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Guy Boisvert 07-02-2010 01:35 PM

Superblock Problem
 
Le 2010-07-01 17:32, m.roth@5-cent.us a écrit :
>> cat /mnt/sysimage/boot/grub/menu.lst
>> ===================================
>> #boot=/dev/md0
>> default=0
>> timeout=5
>> splashimage=(hd0,0)/grub/splash.xpm.gz
>> hiddenmenu
>> title CentOS (2.6.18-164.10.1.el5xen)
>> root (hd0,0)
>> kernel /xen.gz-2.6.18-164.10.1.el5
>> module /vmlinuz-2.6.18-164.10.1.el5xen ro root=/dev/md1 rhgb
>> quiet
>> module /initrd-2.6.18-164.10.1.el5xen.img
>> title CentOS (2.6.18-164.10.1.el5)
>> root (hd0,0)
>> kernel /vmlinuz-2.6.18-164.10.1.el5 ro root=/dev/md1 rhgb quiet
>> initrd /initrd-2.6.18-164.10.1.el5.img
> <snip>
> First, have you tried booting with the second one, or do you require xen?
>
> Second, I find it odd, since the kernel I have with 5.5 is
> 2.6.18-194.3.1.el5 (well, the initial install gave me 2.6.18-194.el5, but
> this was the first upgrade).
>
> Finally, it's almost as though grub were not correctly installed - have
> you checked /boot/grub/device.map?
>
> mark

Hi Mark,

Yes i tried to boot with the other kernels, same result. I'll check
device.map soon (i'm offsite now).

Thanks.

Guy Boisvert
IngTegration inc.

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