Package: grub-pc-bin Version: 2.02~beta3-5 Severity: normal Dear Maintainer,
grub can not load the latest linux-image on Debian Stretch, that is currently package name linux-image-4.9.0-3-amd64, version 4.9.30-2+deb9u2, when this image is inside a compressed squashfs-image. The problem was already present with the previous linux-image, which can be found here: http://snapshot.debian.org/archive/debian/20170609T034604Z/pool/main/l/linux/linux-image-4.9.0-3-amd64_4.9.30-1_amd64.deb To reproduce, create a squashfs-image with only the vmlinuz-image inside it: sudo apt-get install squashfs-tools mkdir -p squashfs_testdir cp -p /boot/vmlinuz-4.9.0-3-amd64 squashfs_testdir/ rm -f squashfs_testimage.img mksquashfs squashfs_testdir squashfs_testimage.img Then copy this test-image to some place where it can be easily accessed by grub, in my case it is in "(lvm/puavo-images)/squashfs_testimage.img". Boot grub and trigger the command prompt mode with "c", then type: grub> loopback loop (lvm/puavo-images)/squashfs_testimage.img grub> crc (loop)/vmlinuz-4.9.0-3-amd64 error: unsupported gzip format grub> linux (loop)/vmlinuz-4.9.0-3-amd64 error: unsupported gzip format If the image is compressed with algorithm other than "gzip", the error message might contain "incorrect compressed chunk". This problem occurs because the "vmlinuz-4.9.0-3-amd64" file ends up into squashfs-image with zero-sized blocks, which the current grub implementation does not know how to handle when the image is compressed. Apparently this is an optimization with sparse files. This problem has been fixed in the grub-version that is in currently in testing, version 2.02-2. I believe the relevant commit is this: https://git.launchpad.net/grub/commit/?id=951306c5094d2bfb46d5baedfde84a2015c4a3fa However, because this issue occurs with the latest default kernel in Stretch, I feel the issue is serious enough to warrant a bug report. Juha -- System Information: Debian Release: 9.1 APT prefers stable APT policy: (990, 'stable'), (500, 'oldstable-updates'), (500, 'oldoldstable-updates'), (500, 'oldoldstable'), (500, 'oldstable'), (30, 'xenial-updates'), (30, 'xenial-security'), (30, 'xenial'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores) Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8), LANGUAGE=fi (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages grub-pc-bin depends on: ii grub-common 2.02~beta3-5 ii libc6 2.24-11+deb9u1 ii libdevmapper1.02.1 2:1.02.137-2 grub-pc-bin recommends no packages. Versions of packages grub-pc-bin suggests: ii desktop-base 9.0.2 -- no debconf information
