Stopped working on arm64 with Alpine Linux 3.20.2 when upgrading kernel (linux-lts 6.6.47-r0 to 6.6.58-r0)

[pbreton]

/usr/bin/docker run --privileged --rm tonistiigi/binfmt --install amd64

installing: amd64 qemu-x86_64 already registered
{
"supported": [
"linux/arm64",
"linux/amd64"
],
"emulators": [
"qemu-x86_64"
]
}

Before kernel upgrade:

docker run -it --rm --platform linux/amd64 alpine:latest uname -m

x86_64

After kernel upgrade:

docker run -it --rm --platform linux/amd64 alpine:latest uname -m

exec /bin/uname: exec format error

Dunno if this is particular to Alpine. This is running a Linux VM in VMware Fusion on a MacBook with an M2 chip.

[jansmets]

uninstall, then re-install.
You're binfmt handler is likely using the systemd installed binfmt handler, which is missing the required binfmt flags which you'd like to have for container environments.
eg, cat /proc/sys/fs/binfmt_misc/qemu-aarch64 , flags => POCF