Re: "FATAL: kernel too old" when running mmdebootstrap'd riscv64 chroot

[Karsten Merker <merker@debian.org>]

On Tue, Oct 23, 2018 at 02:57:35AM +0100, Luke Kenneth Casson Leighton wrote:

> karsten kindly just posted about mmdebootstrap on lowrisc-dev, i
> thought i'd give it a shot.  below is what occurred.  i am using 4.13
> on my laptop because efforts to use post-spectre linux kernels
> actually resulted in "CPU has locked up" messages (which i've never
> seen before).  also i have so many editor sessions open, across so
> many projects, that considering rebooting is a major loss of time and
> context.
> 
> is there any other way to resolve this?
> 
> l.
> 
> root@fizzy:/home/lkcl/src/libreriscv# mmdebstrap
> --architectures=riscv64 --include="debian-ports-archive-keyring" sid
> debian-riscv64-chroot/ "deb http://deb.debian.org/debian-ports/ sid
> main" "deb http://deb.debian.org/debian-ports/ unreleased main"
> I: riscv64 cannot be executed, falling back to qemu-user
> I: automatically chosen mode: root
> I: running apt-get update...
> done
> I: downloading packages with apt...
> done
> I: extracting archives...
> done
> I: installing packages...
> done
> FATAL: kernel too old
> env --unset=APT_CONFIG /usr/sbin/chroot
> /home/lkcl/src/libreriscv/debian-riscv64-chroot dpkg --install
> --force-depends failed at /usr/bin/mmdebstrap line 480.
> root@fizzy:/home/lkcl/src/libreriscv# vi /usr/^C
> root@fizzy:/home/lkcl/src/libreriscv# grep -ri "FATAL: kernel too"
> debian-riscv64-chroot/
> Binary file debian-riscv64-chroot/usr/bin/qemu-riscv64-static matches
> Binary file debian-riscv64-chroot/usr/sbin/ldconfig matches
> Binary file debian-riscv64-chroot/usr/lib/riscv64-linux-gnu/ld-2.27.so matches

There is effectively no way to run Debian riscv64 binaries on a
kernel below 4.15, because 4.15 is the first mainline kernel
version that defines the riscv64 UAPI.  Both glibc and qemu-user
depend on this, so for using the qemu user-mode emulation (which
mmdebstrap does for executing the maintainer scripts in the
packages it installs), the host kernel must be at least version
4.15 as well.

Regards,
Karsten
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