LinuxQuestions.org - [SOLVED] Kernel panic after installing gentoo

- Gentoo (http://www.linuxquestions.org/questions/gentoo-87/)

- - Kernel panic after installing gentoo (http://www.linuxquestions.org/questions/gentoo-87/kernel-panic-after-installing-gentoo-931212/)

Kernel panic after installing gentoo

After installing gentoo using kernel 3.2.1-r2 without genkernel I got the following error message:

Code:

[ 2.352411] Kernel panic - not syncing: VFS: Unable to mount rootfs on unknown-block(2,0)

I guess I forgot to include some kernel modules.
Is there any way I can recompile the kernel without installing gentoo again? Do you know which modules I forgot to include?

fdisk -l /dev/sda

Code:



Disk /dev/sda: 1000.2 GB, 1000204886016 bytes

255 heads, 63 sectors/track, 121601 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x9509763e



   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      102400    7  HPFS/NTFS

Partition 1 does not end on cylinder boundary.

/dev/sda2              13       32651   262160384    7  HPFS/NTFS

Partition 2 does not end on cylinder boundary.

/dev/sda3           32651      112465   641105920    7  HPFS/NTFS

Partition 3 does not end on cylinder boundary.

/dev/sda4          112465      121602    73392128    5  Extended

Partition 4 does not end on cylinder boundary.

/dev/sda5   *      112465      112469       32768   83  Linux

/dev/sda6          112469      115131    21381120   83  Linux

/dev/sda7          115131      115196      524288   82  Linux swap / Solaris

/dev/sda8          115197      115201       32768   83  Linux

/dev/sda9          115201      117863    21381120   83  Linux

/dev/sda10         117863      117928      524288   82  Linux swap / Solaris

/dev/sda11         117928      117932       32768   83  Linux

/dev/sda12         117932      121536    28950528   83  Linux

/dev/sda13         121537      121602      523264   82  Linux swap / Solaris

Gentoo mountpoints:
/dev/sda5 is /boot
/dev/sda6 is /
/dev/sda7 is /swap

My grub.conf :

Code:

# This is a sample grub.conf for use with Genkernel, per the Gentoo handbook

# http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=10#doc_chap2

# If you are not using Genkernel and you need help creating this file, you

# should consult the handbook. Alternatively, consult the grub.conf.sample that

# is included with the Grub documentation.



default 0

timeout 30

splashimage=(hd0,4)/grub/splash.xpm.gz



title Windows 7

rootnoverify (hd0,0)

makeactive

chainloader +1



title Gentoo Linux 3.2.1-r2

root (hd0,4)

kernel /kernel-3.2.1-gentoo-r2 ro root=/dev/sda6 



title Arch Linux

root (hd0,10)

kernel /vmlinuz-linux root=/dev/sda12 ro vga=795

initrd /initramfs-linux.img



title Arch Linux Fallback

root (hd0,10)

kernel /vmlinuz-linux root=/dev/sda12 ro vga=795

initrd /initramfs-linux-fallback.img



title Slackware64 13.37

root (hd0,7)

kernel /vmlinuz-huge-2.6.37.6 root=/dev/sda9

initrd /config-huge-2.6.37.6



title Slackware64 13.37 Failsafe

root (hd0,7)

kernel /vmlinuz-generic-2.6.37.6 root=/dev/sda9

initrd /config-generic-2.6.37.6



#root (hd0,0)

#kernel /boot/kernel-genkernel-x86-2.6.24-gentoo-r5 root=/dev/ram0 real_root=/dev/sda3

#initrd /boot/initramfs-genkernel-x86-2.6.24-gentoo-r5









# vim:ft=conf:

EDIT:

chrooted again using Gentoo CD and recompiled kernel (and copied bzImage to /boot) , but I get same error message. I uploaded kernel config file. Also, startx doesn't work:

Code:

(EE) Failed to load module "vesa"

(EE) Failed to load module "fbdev"

vesa and fbdev are included in USE flags.

----------------------

I will come back after I will install it again.

genkernel uses an initrd. You will need one too unless you build all the required support to mount the root into the kernel (i.e. not as modules).
I've never used genkernel, and tended to use my own config. Means you doing the legwork for your box. Things are significantly easier these days - try "make localyesconfig".

So if I type "make localyesconfig" it will generate an initrd image?

No, it won't - perhaps you didn't read the bit after "unless".
"make --help" will list the options and a brief description. After that, a good search engine is invaluable - gentoo has always had good doco.

I recompiled the kernel and I included all the filesystems (not as modules) excepting the experimental ones. It still gives the same error, but now it loads nouveau before the kernel panic, see the picture I uploaded.

Code:

mount /dev/sda6 /mnt/gentoo

mount /dev/sda5 /mnt/gentoo/boot

mount -t proc none /mnt/gentoo/proc

mount --rbind /dev /mnt/gentoo/dev

chroot /mnt/gentoo /bin/bash

env-update

source /etc/profile

export PS1="(chroot) $PS1"

cd /usr/src/linux-3.2.1-gentoo-r1

make clean

make menuconfig

make localyesconfig

make && make modules_install

cp -L arch/x86_64/boot/bzImage /boot/kernel-3.2.1-gentoo-r1

reboot

/etc/fstab :

Code:



# /etc/fstab: static file system information.

#

# noatime turns off atimes for increased performance (atimes normally aren't 

# needed); notail increases performance of ReiserFS (at the expense of storage 

# efficiency).  It's safe to drop the noatime options if you want and to 

# switch between notail / tail freely.

#

# The root filesystem should have a pass number of either 0 or 1.

# All other filesystems should have a pass number of 0 or greater than 1.

#

# See the manpage fstab(5) for more information.

#



# <fs>                        <mountpoint>        <type>                <opts>                <dump/pass>



# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.

/dev/BOOT                /boot                ext2                noauto,noatime        1 2

/dev/ROOT                /                ext4                defaults,noatime                0 1

/dev/SWAP                none                swap                sw                0 0

/dev/cdrom                /mnt/cdrom        auto                noauto,ro        0 0

/dev/fd0                /mnt/floppy        auto                noauto                0 0



proc                        /proc                proc                defaults        0 0

shm                        /dev/shm        tmpfs                nodev,nosuid,noexec        0 0

Thank you for your answers!

I forgot to include Nvidia SATA driver, now it works.