On 2022/8/22 15:58, Greg KH wrote:
On Mon, Aug 22, 2022 at 03:49:51PM +0800, Qu Wenruo wrote:
On 2022/8/22 15:33, Greg KH wrote:
On Mon, Aug 22, 2022 at 03:24:53PM +0800, Qu Wenruo wrote:
On 2022/8/22 14:25, Greg KH wrote:
On Mon, Aug 22, 2022 at 09:15:59AM +0800, Qu Wenruo wrote:
Hi,
When backporting some btrfs specific patches to all LTS kernels, I found
v4.14.290 kernel unable to boot as a KVM guest with edk2-ovmf
(edk2-ovmf: 202205, qemu 7.0.0, libvirt 1:8.6.0).
While all other LTS/stable branches (4.19.x, 5.4.x, 5.10.x, 5.15.x,
5.18.x, 5.19.x) can boot without a hipccup.
I tried the following configs, but none of them can even provide an
early output:
- CONFIG_X86_VERBOSE_BOOTUP
- CONFIG_EARLY_PRINTK
- CONFIG_EARLY_PRINTK_EFI
Is this a known bug or something new?
Has this ever worked properly on this very old kernel tree? If so, can
you use 'git bisect' to find the offending commit?
Unfortunately the initial v4.14 from upstream can not even be compiled.
Really? Try using an older version of gcc and you should be fine. It
did build properly back in 2017 when it was released :)
Yeah, I'm pretty sure my toolchain is too new for v4.14.0. But my distro
only provides the latest and mostly upstream packages.
It may be a even worse disaster to find a way to rollback to older
toolchains using my distro...
Also my hardware may not be well suited for older kernels either.
(Zen 3 CPU used here)
In fact, I even find it hard just to locate a v4.14.x tag that can compile.
After some bisection between v4.14.x tags, only v4.14.268 and newer tags
can even be compiled using latest toolchain.
(But still tons of warning, and tons of objdump warnings against
insn_get_length()).
I'm not sure what's the normal practice for backports to such old branch.
Do you stable guys keep dedicated VMs loaded with older distro just for
these old branches?
I don't, that's why those kernels can be built with newer versions of
gcc.
Your distro should have a version of gcc-10 or gcc-9 that can be
installed, right?
This may sounds like a meme, but I'm really using Archlinux for my VM
and host, and it doesn't provide older GCC at all.
Or maybe use the gcc versions on kernel.org that only
work for kernel builds?
If so, any recommendation on those kinda retro distro?
Try installing an old version of Debian, or better yet, use a distro
that provides old versions of gcc :)
I guess that's the only way to go.
Thanks for all the advice,
Qu
good luck!
greg k-h
