[gentoo-user] kernel panic - lilo can't find boot

[gentoo-user] kernel panic - lilo can't find boot

[Walter Dnes]

  I'm trying to revive an older Lenovo.  It has worked in the past.
Here is the kernel panic error (3 lines)...

VFS: Cannot open device "801" or unknown-block (8,1): error -6
Please append a correct "root=" boot option: here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root on unknown-block (8,1)

  I've pulled in a working configuration from an old backup, so it
should work.  I'm also listing "fdisk -l", "ll /boot", and
/etc/lilo.conf  (the machine is too old for UEFI).  Any ideas?

===========================================================================

Disk /dev/sda: 74.53 GiB, 80026361856 bytes, 156301488 sectors
Disk model: WDC WD800BEVS-08
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x16cab3f2

Device     Boot     Start       End   Sectors  Size Id Type
/dev/sda1  *         2048 134219775 134217728   64G 83 Linux
/dev/sda2       134219776 156301487  22081712 10.5G 82 Linux swap / Solaris

===========================================================================

drwxr-xr-x  2 root root    4096 Jul 24 06:34 .
drwxr-xr-x 21 root root    4096 Apr 25 03:16 ..
-rw-r--r--  1 root root       0 Apr 12 18:57 .keep
-rw-------  1 root root  165376 Jul 24 06:34 .map
-rw-r--r--  1 root root 3806788 Jul 24 06:30 System.map.experimental
-rw-r--r--  1 root root 3806788 Jul 24 06:31 System.map.production
-rw-r--r--  1 root root     512 Jul 24 05:38 boot.0800
-rw-r--r--  1 root root  106972 Jul 24 06:30 config.experimental
-rw-r--r--  1 root root  106972 Jul 24 06:31 config.production
-rw-r--r--  1 root root 7596800 Jul 24 06:30 kernel.experimental
-rw-r--r--  1 root root 7596800 Jul 24 06:31 kernel.production

===========================================================================

# Faster, but won't work on all systems:
#compact
# Should work for most systems, and do not have the sector limit:
lba32
# If lba32 do not work, use linear:
#linear

# MBR to install LILO to:
boot = /dev/sda
map = /boot/.map

install = /boot/boot-menu.b   # Note that for lilo-22.5.5 or later you
                              # do not need boot-{text,menu,bmp}.b in
                              # /boot, as they are linked into the lilo
                              # binary.

menu-scheme=Wb
prompt
# If you always want to see the prompt with a 15 second timeout:
timeout=150
delay = 50
#
# End LILO global section
#

#
# Linux bootable partition config begins
#
image = /boot/kernel.production
        root = /dev/sda1
        label = Production
        read-only # read-only for checking
        append = "noexec=on net.ifnames=0 intel_pstate=disable ipv6.disable=1"

image = /boot/kernel.experimental
        root = /dev/sda1
        label = Experimental
        read-only # read-only for checking
        append = "noexec=on net.ifnames=0 intel_pstate=disable ipv6.disable=1"

#
# Linux bootable partition config ends
#

===========================================================================

-- 
Walter Dnes <waltdnes@waltdnes.org>
I don't run "desktop environments"; I run useful applications

Re: [gentoo-user] kernel panic - lilo can't find boot

[Wols Lists]

On 24/07/2022 12:01, Walter Dnes wrote:
>    I'm trying to revive an older Lenovo.  It has worked in the past.
> Here is the kernel panic error (3 lines)...
> 
> VFS: Cannot open device "801" or unknown-block (8,1): error -6
> Please append a correct "root=" boot option: here are the available partitions:
> Kernel panic - not syncing: VFS: Unable to mount root on unknown-block (8,1)
> 
>    I've pulled in a working configuration from an old backup, so it
> should work.  I'm also listing "fdisk -l", "ll /boot", and
> /etc/lilo.conf  (the machine is too old for UEFI).  Any ideas?
> 
Dunno about modern lilo, and I get the impression from what you're 
saying that the kernel may have loaded but be crashing looking for root?

But my memories of lilo was it was very important you had to re-run it 
every time you changed kernel, because it didn't know where the kernel 
was by path, it coded the actual lba reference into the boot code.

So that might mean, if the kernel has been upgraded, an old boot config 
might not work.

I know older SUSE install media had "boot system on disk" as one of 
their options - might that work if you can boot from CD-Rom or USB?

Cheers,
Wol

Re: [gentoo-user] kernel panic - lilo can't find boot

[Neil Bothwick]

[-- Attachment #1: Type: text/plain, Size: 696 bytes --]

On Sun, 24 Jul 2022 07:01:21 -0400, Walter Dnes wrote:

>   I'm trying to revive an older Lenovo.  It has worked in the past.
> Here is the kernel panic error (3 lines)...
> 
> VFS: Cannot open device "801" or unknown-block (8,1): error -6
> Please append a correct "root=" boot option: here are the available
> partitions: Kernel panic - not syncing: VFS: Unable to mount root on
> unknown-block (8,1)

It looks like your boot partition is not found, which points to a disk
driver issue. Check the BIOS of the computer to make sure it is using
SATA for the controller, or whatever your kernel is set up to use.


-- 
Neil Bothwick

The thrill of victory, the agony of delete.

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

Re: [gentoo-user] kernel panic - lilo can't find boot

[Walter Dnes]

On Sun, Jul 24, 2022 at 02:31:47PM +0100, Neil Bothwick wrote

> It looks like your boot partition is not found, which points to a disk
> driver issue. Check the BIOS of the computer to make sure it is using
> SATA for the controller, or whatever your kernel is set up to use.

  To quote Elvis... "Thank you, thank you, thank you very very much".  I
went into the BIOS, toggled from "SATA" to "AHCI", and it booted up just
fine.  I'm now running update world on the laptop.

-- 
Walter Dnes <waltdnes@waltdnes.org>
I don't run "desktop environments"; I run useful applications

Re: [gentoo-user] kernel panic - lilo can't find boot

[karl]

Walter Dnes:
> VFS: Cannot open device "801" or unknown-block (8,1): error -6
> Please append a correct "root=" boot option: here are the available partitions:
> Kernel panic - not syncing: VFS: Unable to mount root on unknown-block (8,1)
...
>   I've pulled in a working configuration from an old backup, so it
> should work.
...
> Disk model: WDC WD800BEVS-08
...
> image = /boot/kernel.production
>         root = /dev/sda1
>         label = Production
>         read-only # read-only for checking
>         append = "noexec=on net.ifnames=0 intel_pstate=disable ipv6.disable=1"
...

The kernel is missing the driver for your disk device.

801 is /dev/sda1:
# ls -l /dev/sda1
brw-rw---- 1 root disk 8, 1 Aug  4  2013 /dev/sda1

WD800BEVS-08 is a 5400rpm 2.5inch sata disk.
Go into the bios and set up sata to be AHCI.

You have no initrd/initramfs so:
 "SCSI disk support"
 "Serial ATA and Parallel ATA drivers (libata)"
 "AHCI SATA support"
and possilbe also
 "Platform AHCI SATA support"
driver must be compiled in in the kernel.

 You can check that by doing something like:
# grep BLK_DEV_SD= /boot/config.production
CONFIG_BLK_DEV_SD=y
# grep CONFIG_SATA_AHCI /boot/config.production
CONFIG_SATA_AHCI=y
CONFIG_SATA_AHCI_PLATFORM=y

You must also compile in the filesystem used for /
(perhaps it is ext4).

# grep CONFIG_EXT4_FS= /boot/config.production
CONFIG_EXT4_FS=y

Every time you change the kernel you have to rerun lilo.

Regards,
/Karl Hammar

Re: [gentoo-user] kernel panic - lilo can't find boot

[Walter Dnes]

On Sun, Jul 24, 2022 at 05:15:48PM +0200, karl@aspodata.se wrote

> WD800BEVS-08 is a 5400rpm 2.5inch sata disk.
> Go into the bios and set up sata to be AHCI.

  Thanks for the additional details.  At Neil Bothwick's suggestion I've
already toggled the BIOS from SATA to AHCI, and the system now boots up
fine.  I'm currently running an update world on it.

-- 
Walter Dnes <waltdnes@waltdnes.org>
I don't run "desktop environments"; I run useful applications