Bug#977647: 5.10.1 Debian kernel does not boot on amd64 with btrfs rootfs

[Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>]

Package: linux-image-5.10.0-trunk-amd64-unsigned
Version: 5.10.1-1~exp1
Severity: grave
Justification: renders package unusable

Dear Debian kernel maintainers,

Debian kernel 5.10.1 in experimental does not boot on my x86_64 notebook
with btrfs rootfs.
As I am suspecting btrfs as
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977645

This strengthen my suspicion about 5.10.1 btrfs...

Photo of booting console is found at
https://photos.app.goo.gl/zyCg4ZH8zDgwoiBr8

We observe that systemd accessed some files in btrfs rootfs,
so the situation seems somewhat better than
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977645

Best regards, Ryutaroh Matsumoto