On 2020-03-17 11:13, Turritopsis Dohrnii Teo En Ming via blfs-support
wrote:
Subject: Teo En Ming's Linux From Scratch (LFS) 20200302-systemd
Bootable Live CD/DVD Kernel Panic
Good day from Singapore to all Linux users,
Recently, on 12 March 2020, I have successfully created my own custom
Linux distribution which I affectionately call it Teo En Ming Linux.
My custom Linux distribution is based on the most basic Linux From
Scratch (LFS) 20200302-systemd book and Linux kernel 5.5.7. I am able
to boot it successfully on
my Toshiba 1 TB 3.5 inch SATA internal harddisk /dev/sdb2.
After the initial success, I wanted to make a bootable Live CD/DVD of
my Linux From Scratch system. I followed Jimmy Anderson's guide (which
was written more
than 7 years ago on 20 Jan 2013) and modified his guide in trying to
make it work with LFS 20200302-systemd book.
You may refer to the following guides on how I created a bootable Live
CD/DVD of my Linux From Scratch system.
Blog post #1: "How to create a Bootable Live CD/DVD from your Linux
From Scratch (LFS) build"
Link:
https://tdtemcerts.blogspot.com/2020/03/how-to-create-bootable-live-cddvd-from.html
Blog post #2: "Patching Linux Kernel 5.5.7 to Add Support for AUFS
Filesystem"
Link:
https://tdtemcerts.blogspot.com/2020/03/patching-linux-kernel-557-to-add.html
When I booted up my bootable Live CD/DVD, I got a kernel panic.
Looking at the following screenshot, it seems that my 64-bit Live CD
booted in 32-bit mode.
Screenshot:
https://1.bp.blogspot.com/-P_EcnlhuDIQ/XnDso3sjNZI/AAAAAAAAAqw/qa5EZoHQQa8WxJxnqp43b9quHGIclXSJwCNcBGAsYHQ/s1600/booted%2Bvia%2Bstartup%2B32.png
Notice the "trampoline_32bit" and "booted via startup_32()" lines on
the above screenshot.
The following screenshot illustrates the kernel panic.
Screenshot:
https://1.bp.blogspot.com/-uSNEk19fG7s/XnDtZf-80_I/AAAAAAAAAq4/Q-GAHKnWe_ISvmoqW6iFjncdZEkgwD90wCNcBGAsYHQ/s1600/kernel%2Bpanic.png
My guess is that my 64-bit Live CD booted up in 32-bit mode, and when
it tried to execute /sbin/init (symlink to systemd binary) after
mounting the squashfs root file system, which is 64-bit, it resulted
in a kernel panic. What I am trying to say is that the 64-bit Linux
kernel on the Live CD boots up in 32-bit mode (my guess), and then
tried to execute purely 64-bit binaries, which results in a kernel
panic.
Please advise me on how I can resolve this issue and produce a working
Live CD of my LFS system without kernel panic.
Thank you very much.
Check for the following in the config of the current kernel in the boot
image:
CONFIG_64BIT=y
CONFIG_X86_64=y
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