Am Freitag, dem 18.04.2025 um 19:10 +0300 schrieb Martin-Éric Racine: > The Debian changelog suggests what caused this: > > Someone enabled compiling GRUB with FUSE3 to enhance QEMU support. > The problem with FUSE3 is that it only has very basic support for > btrfs, lacking among other things support for subvolumes. This is a > serious issue considering how widely spread btrfs has become and how > debian-installer uses subvolumes by default whenever someone selects > brtfs as the filesystem type. Rendering hosts unbootable is a big > no-no. I would really hope the release team to step in on this one. > > Martin-Éric >
Hi Martin-Éric, FUSE support in GRUB 2 is only used for the grub-mount binary. And not at all in the actual booting code loaded from EFI/BIOS. You could though test the fs drivers of it with grub-mount: grub-mount /dev/sda2 /mnt (replace sda2 with your / partition) sha1sum /mnt/@rootfs/boot/initrd.img-6.12.20-amd64 sha1sum /@rootfs/boot/initrd.img-6.12.20-amd64 both commands should output the same hash sum. And yes, this is safe with a mounted fs because the GRUB fs code is 100% complete read-only. Felix
