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Old 09-03-2012, 01:05 AM   #1
k84834
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kernel panic not syncing vfs unable to mount root fs on unknown block(0,0)


Hi
I am trying LFS7.1
I build LFS system on Vm machine(my host system is VM). I build LFS on a 10G partition that mounted on /mn/lfs
I use my host grub to booting LFS. and add lfs as menuentry to host grub.cfg
my host system specific came below:
Code:
root@32-bit:/home/ubuntu-32bit# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000dbaf5

Device Boot Start End Blocks Id System
/dev/sda1 2048 39063551 19530752 83 Linux
/dev/sda2 39065598 41940991 1437697 5 Extended
/dev/sda5 39065600 41940991 1437696 82 Linux swap / Solaris

Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders, total 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x5e672529

Device Boot Start End Blocks Id System
/dev/sdb1 * 63 20971519 10485728+ 83 Linux



root@32-bit:/home/ubuntu-32bit# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda1 ext3 19G 4.0G 14G 23% /
udev devtmpfs 1000M 4.0K 1000M 1% /dev
tmpfs tmpfs 403M 708K 402M 1% /run
none tmpfs 5.0M 0 5.0M 0% /run/lock
none tmpfs 1007M 0 1007M 0% /run/shm
/dev/sdb1 ext3 9.9G 2.0G 7.4G 22% /mnt/lfs
shm tmpfs 1007M 0 1007M 0% /run/shm
root@32-bit:/home/ubuntu-32bit#
boot error is attached to the post.
Attached Images
File Type: png pic6.png (23.0 KB, 12 views)

Last edited by k84834; 09-03-2012 at 01:08 AM.
 
Old 09-04-2012, 10:37 AM   #2
Didier Spaier
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Distribution: Slackware{,64}-{14.1,current} on a Lenovo Thinkpad T61 6457-4XG
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Maybe your grub config is wrong about the root partition (supposed to be sdb1)?

Or /dev/sdb1 is a removable device (typically an USB hard disk) and then:
- either it needs some time to synchronize => add: append "rootdelay=30" to your grub config
- or the kernel numbered it differently this time. Then in /etc/fstab name it by UUID=xxx, not by /dev/sdbn. To know the value xxx for this drive, use the blkid command
 
  


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