Question: MPTCP kernel installation in VBox VM

Hello,

I'm trying to install MPTCP v0.96 (linux kernel 5.4.230.mptcp) using the available deb packages (from https://github.com/multipath-tcp/mptcp/releases), into a VirtualBox (v7.0.12) VM running 64-bit Ubuntu 22.04 (kernel 6.2.0-37-generic).

But kernel boot load fails with: initramfs unpacking failed invalid magic at start of compressed archive, and Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

I have searched each and every post in the internet but could not find a solution to this:

have tried with different disk controllers -- https://forums.virtualbox.org/viewtopic.php?t=49533
updated initramfs and then grub according to https://askubuntu.com/questions/41930/kernel-panic-not-syncing-vfs-unable-to-mount-root-fs-on-unknown-block0-0
some manual actions mounting my root partition according to https://www.geekswarrior.com/2019/07/solved-how-to-fix-kernel-panic-on-linux.html
for the "initramfs unpacking" initial log, just found out that initramfs compression scheme is different in newer kernels (CONFIG_RD_ZSTD=y option is missing from 5.4.230.mptcp, while it is present in my running 6.2.0-37). But I'm not sure if this should be an issue since GZIP compression is supported in 5.4.230.mptcp config.

I am not familiar with the linux kernel specifics, but I'd first like to understand if there is some known compatibility/dependency issue between my running kernel (6.2.0-37), and the MPTCP one (5.4.230.mptcp) I'm trying to boot from.

In case there is no such incompatibility and it should be expected to work, then it would probably be a virtualbox specific issue (?)

Just for the record, I've tried building myself 5.4.243, with the exact same issue during boot.

Maybe I miss something vital in the whole procedure. Any hints from your past experience are highly appreciated.

Thanks in advance for your time and help.

Regards, Dimitris

multipath-tcp / mptcp

Question: MPTCP kernel installation in VBox VM #519