[SOLVED] Kernel Panic during first boot for fresh system

leopold75 · 12-01-2014, 08:41 AM

Hello there!

Please, can You help with my problem?
I want to learn more how Linux works and made own distro with manual
"LSF - Version 7.6-systemd"

All went OK but for 1st boot I see Kernel Panic after ~ 2-3 sec for booting process.

Only hard reset can help.

Please, assist me how to "catch" kernel error messages for investigation?
And what is next steps?

Thank You!

spiky0011 · 12-01-2014, 11:28 AM

Hi

Abit more info might help, have you built in a VM or anything like that Is it on a usb drive, and what partition lfs is installed on.
post

Code:

fdisk -l

and maybe your "fstab", grub.cfg. That should do for now

leopold75 · 12-02-2014, 06:45 AM

Hello, Spiky0011!

Thank You for reply.

So, below please find my answers:

1) I use native (not VM) OS and partitions. Host system - Ubuntu 14.10 x64
2) In my PC I have 3 HDD. /dev/sda used for Windows OSes, /dev/sdb - for diff Ubunty releases, I trying install LFS to /dev/sdc3 (dev/sdc1 pointed to swap)

fstab:

Quote:

# Begin /etc/fstab
# file system mount-point type options dump fsck order

/dev/sdc3 / ext4 defaults 1 1
/dev/sdc1 swap swap pri=1 0 0

# End /etc/fstab

spiky0011 · 12-02-2014, 10:16 AM

Ok what dose grub.cfg look like, is sdc a usb drive?

leopold75 · 12-02-2014, 03:49 PM

Hello! No, sdc typical HDD (not like USB)

Quote:

/dev/sdc1: UUID="87fbd173-8875-4a20-8ce5-5e5952813af5" TYPE="swap" PARTUUID="975f975f-01"
/dev/sdc2: UUID="0064c6e7-f263-46d3-ad1b-6ff55afd85f7" TYPE="ext4" PARTUUID="975f975f-02"
/dev/sdc3: UUID="5ba0805b-1cab-4330-abe7-dc9e636ee754" TYPE="ext4" PARTUUID="975f975f-03"

Quote:

Disk /dev/sdc: 37.3 GiB, 40020664320 bytes, 78165360 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
Disklabel type: dos
Disk identifier: 0x975f975f

Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 5785599 5783552 2.8G 82 Linux swap / Solaris
/dev/sdc2 5785600 36763647 30978048 14.8G 83 Linux
/dev/sdc3 36763648 78165359 41401712 19.8G 83 Linux

grub.cfg (part)

Quote:

menuentry 'Linux From Scratch (7.6-systemd) (on /dev/sdc3)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-5ba0805b-1cab-4330-abe7-dc9e636ee754' {
insmod part_msdos
insmod ext2
set root='hd2,msdos3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos3 --hint-efi=hd2,msdos3 --hint-baremetal=ahci2,msdos3 5ba0805b-1cab-4330-abe7-dc9e636ee754
else
search --no-floppy --fs-uuid --set=root 5ba0805b-1cab-4330-abe7-dc9e636ee754
fi
linux /boot/vmlinuz-3.16.2-lfs-7.6-systemd root=/dev/sdc3 ro
}
submenu 'Advanced options for Linux From Scratch (7.6-systemd) (on /dev/sdc3)' $menuentry_id_option 'osprober-gnulinux-advanced-5ba0805b-1cab-4330-abe7-dc9e636ee754' {
menuentry 'GNU/Linux, Linux 3.16.2-lfs-7.6-systemd (on /dev/sdc3)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-3.16.2-lfs-7.6-systemd--5ba0805b-1cab-4330-abe7-dc9e636ee754' {
insmod part_msdos
insmod ext2
set root='hd2,msdos3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd2,msdos3 --hint-efi=hd2,msdos3 --hint-baremetal=ahci2,msdos3 5ba0805b-1cab-4330-abe7-dc9e636ee754
else
search --no-floppy --fs-uuid --set=root 5ba0805b-1cab-4330-abe7-dc9e636ee754
fi
linux /boot/vmlinuz-3.16.2-lfs-7.6-systemd root=/dev/sdc3 ro
}
}

I saw message _not syncing: VFS: Unable to mount root fs on unknown-block(0,0)_

spiky0011 · 12-02-2014, 04:38 PM

Only thing I can think of is something in the kernel not configured hard drive type maybe. File system, although ext4 I found is enabled as is dvtmpfs, did you check, I presume your fstab is complete as it is in the book.

The other parts look ok to me

Teufel · 12-02-2014, 06:29 PM

Quote:

Originally Posted by leopold75

I saw message _not syncing: VFS: Unable to mount root fs on unknown-block(0,0)_

Mostly this error occurs due to missed SATA controller driver, or driver was built as loadable module. Driver should be built in kernel. Check out your kernel config.
Another possible reason - DEVTMPFS not enabled or enabled as module. Should be built in as well.
If you do not know which driver you have to enable for your sata controller, there is a good site with instructions:
http://kmuto.jp/debian/hcl/

leopold75 · 12-03-2014, 03:53 AM

Thank You for advise.
No luck, I just copied config file from host system, had it configured it with "menuconfig" as mentioned in Manual.
vmlinuz-3.16.2-lfs-7.6-systemd increased up to 1M, and alot of new modules were inslalled.
The same message occured _not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

So, better way I guess - remove all disks from PC, and try prepare LFS from null with 1 HDD and separated /boot on clear SATA.
Also I'll retry the same under x86 arch.

Thank You for help!

spiky0011 · 12-03-2014, 04:37 AM

do you have boot on a seperate drive?

leopold75 · 12-03-2014, 05:07 AM

Quote:

do you have boot on a seperate drive?

No, whole LSF dir structure located on /dev/sdc3
Main GRUB boot loader installed on /dev/sda (I made grub-install /dev/sda --force --recheck)

I already unplugged /dev/sda and /dev/sdb , booted from CD and installed GRUB to /dev/sdc , fixed /etc/fstab

No luck. The same. I guess issue in old HDD (he plugged via IDE cable)

Anyway goint to install from zero on fresh PC with 14.04.1 x86 and then x86_64

Will report later.

Teufel · 12-03-2014, 05:27 AM

Using Ubuntu's kernel config may mis-orient you. Because Ubuntu uses initrd, and some of modules there, not built in kernel, so using Ubuntu config is not a way to go.
What is your mobo model?

Though there is another way to configure kernel:

Quote:

make localmodconfig

this command searches for your devices and creates config depending on it. Keep in mind: all the devices you planned to use should be attached: usb stick, usb hdd, camera, hid devices.
Using this config will lead to a bit bloated kernel, but it should be loadable and might be taken as a good start point. You can compare this config to your current one, especially for "Device drivers" section to get idea whats wrong with your config

If your drive is IDE, it will require PATA drivers as well.

leopold75 · 12-03-2014, 05:39 AM

Quote:

what is your mobo model?

asus p5kc

Teufel · 12-03-2014, 06:41 AM

Your mobo operates with JMB363 PATA and SATA controllers. BTW as one of mine mobos.
Do you have enabled JMicron PATA/SATA support? it is a PATA_JMICRON option.
Run make menuconfig and press "/" key to get into search mode. Type "jmicron" to search and press Enter. It will show do you have jmicron support enabled. Options should be set to [y], not [m].

Or it can be checked this way:

Code:

# cat .config | grep JMICRON
CONFIG_PATA_JMICRON=y

P.S.
it would be nice to check these options as well:

Code:

# cat .config |grep DEVTMP
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y

leopold75 · 12-03-2014, 06:49 AM

Ah so! You are right! I have jmicron support enabled via BIOS and use /dev/sdc within.
I thought jmicron will be populated with devices...Ok, thank You very much! Will try asap.

leopold75 · 12-03-2014, 01:22 PM

YES!!! I am able to boot!!!!

Issue was really in JMICRON kernel settings

By default this option marked as "not set"

Once I fixed up to CONFIG_PATA_JMICRON=y system had soared!

Teufel, VIELEN DANK!

Btw, "make localmodconfig" not working in chroot, issue with some .pl file.
I dig more. Also internet not available, but this is ganz andere Geschichte.

Issue solved, thank You very much for help.