Kernel Panic! Unable to mount root fs...

DarkNebula · 09-29-2004, 04:10 PM

After installing gentoo and trying to boot it I get... Kernel panic VFS: unable to mount root fs on 3:04. Here are some things that might help.

lilo.conf:

Code:

boot=/dev/hda
prompt
timeout=500
default=gentoo
vga=788

image=/boot/kernel-2.4.26-gentoo-r6
 label=gentoo
 read-only
 root=/dev/hda4

other=/dev/hda2
 label=windows

fstab:

Code:

/dev/hda1  /boot  ext2 noauto,noatime 1 1
/dev/hda4 /  ext3 noatime 0 0
/dev/hda3 none swap sw 0 0
/dev/cdroms/cdrom0 /mnt/cdrom iso9660 noauto,ro 0 0

none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0

fdisk -l

Code:

Disk /dev/ide/host0/bus0/target0/lun0/disc : 80.0 GB


/dev/ide/host0/bus0/target0/lun0/disk/part1 * 1-63 : 31720+ (size) : 83 (ID)
/dev/ide/host0/bus0/target0/lun0/disk/part2 * 25242-155059 : 65428272 : 7
/dev/ide/host0/bus0/target0/lun0/disk/part3    64-1056: 500472 : 82
/dev/ide/host0/bus0/target0/lun0/disk/part4    1057-25241: 12189240 : 83

secesh · 09-29-2004, 09:56 PM

Quote:

unable to mount root fs
...
/dev/hda4 / ext3 noatime 0 0

did you recently re-compile your kernel? Are you sure that since your re-compilation you have ext3 support with your kernel?

dmx9595 · 10-17-2004, 08:08 PM

i got the same problem, gentoo amd64 2004.2 kern 2.6.7 and im using grub and i get unable to mount root fs kernel panic although my partitions and everything seem correct and filesystem support is built in correctly

Bruce Hill · 10-17-2004, 08:15 PM

Quote:

Originally posted by DarkNebula
After installing gentoo and trying to boot it I get... Kernel panic VFS: unable to mount root fs on 3:04. Here are some things that might help.

It's been almost 3 weeks, and you've probably gotten it fixed now,
but I'd like to ask one question. What type of hard drive do you have,
and how is it being detected? You should see that before the kernel
panic message.

mary · 10-17-2004, 08:19 PM

Are you *sure* you:

- didn't make a typo on the drive letter/number?
- have ext3 support compiled into your kernel? (not a module!)

dmx9595 · 10-17-2004, 09:05 PM

yes
infact there are many people have the same problem witht hte 2.6kernels, the known fix it to issue the minor major block number to root= instead of the /dev method its worked for many ppl however not for me cause on my debian sys i issue ls -l /dev/hda10 and its 3, 10 so thats 0310 so i do root=0310 and it _should_ work but when i boot it says cant load 0310 or hda16 but it sohuld be hda16 but hda10 so just a guess i tried 10-6 0304 and then it said cant load 0304 or hda4 so thats werid and thats why this fix isnt working for me, however go get it working for you http://kerneltrap.org/node/view/1955...ts_per_page=35

Komakino · 10-24-2004, 06:30 PM

Quote:

Originally posted by dmx9595
yes
infact there are many people have the same problem witht hte 2.6kernels, the known fix it to issue the minor major block number to root= instead of the /dev method its worked for many ppl however not for me cause on my debian sys i issue ls -l /dev/hda10 and its 3, 10 so thats 0310 so i do root=0310 and it _should_ work but when i boot it says cant load 0310 or hda16 but it sohuld be hda16 but hda10 so just a guess i tried 10-6 0304 and then it said cant load 0304 or hda4 so thats werid and thats why this fix isnt working for me, however go get it working for you http://kerneltrap.org/node/view/1955...ts_per_page=35

No, it says to do it in HEXADECIMAL so 10 becomes 0A, not 10 which is 16 decimal, hence it looks for hda16 when you boot.. The number you want is root=030A

Bruce Hill · 10-24-2004, 06:38 PM

For those last two threads, read the original post.

First, it's not a 2.6.x kernel issue and second, the poster
is using LILO and not GRUB...