|
| From: | Vladimir 'phcoder' Serbinenko |
| Subject: | Re: address@hidden: Bug#866603: grub-common: enabling metadata_csum_seed feature on ext4 renders system unbootable] |
| Date: | Fri, 30 Jun 2017 12:43:02 +0000 |
Hi,
Could we possibly just ignore this feature for GRUB? For better or
worse we don't implement metadata checksumming, and we're only doing
read-only access, so I think it would be reasonably safe to ignore
metadata_csum_seed since we wouldn't do anything with it anyway.
Thanks,
--
Colin Watson [address@hidden]
---------- Forwarded message ----------
From: "Thorsten Tüllmann" <address@hidden>
To: Debian Bug Tracking System <address@hidden>
Cc:
Bcc:
Date: Fri, 30 Jun 2017 14:00:27 +0200
Subject: Bug#866603: grub-common: enabling metadata_csum_seed feature on ext4 renders system unbootable
Package: grub-common
Version: 2.02-1
Severity: important
Dear Maintainer,
enabling metadata_csum_seed allows to change the UUID of a mounted ext4 filesystem, which
is useful for cloned virtual machines. Unfortunately, grub does not recognize this feature.
If this is enabled on the root filesystem, the system is rendered unbootable.
address@hidden:~# grub-probe --target=fs --device /dev/sda1
ext2
address@hidden:~# tune2fs -O metadata_csum_seed /dev/sda1
tune2fs 1.43.4 (31-Jan-2017)
address@hidden:~# grub-probe --target=fs --device /dev/sda1
grub-probe: error: unknown filesystem.
address@hidden:~# file -Ls /dev/sda1
/dev/sda1: Linux rev 1.0 ext4 filesystem data, UUID=e692d65c-6677-4123-8bef-5daa7edb1a52 (needs journal recovery) (extents) (64bit) (large files) (huge files)
Thorsten
-- Package-specific info:
*********************** BEGIN /proc/mounts
/dev/sda1 / ext4 rw,relatime,errors=remount-ro,data="" 0 0
*********************** END /proc/mounts
*********************** BEGIN /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if loadfont unicode ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ] ; then
set timeout=30
else
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
set gfxpayload="${1}"
}
set linux_gfx_mode=
export linux_gfx_mode
menuentry 'Debian GNU/Linux' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-/dev/sda1' {
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_msdos
echo 'Loading Linux 4.9.0-3-amd64 ...'
linux /boot/vmlinuz-4.9.0-3-amd64 root=/dev/sda1 ro quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.9.0-3-amd64
}
submenu 'Advanced options for Debian GNU/Linux' $menuentry_id_option 'gnulinux-advanced-/dev/sda1' {
menuentry 'Debian GNU/Linux, with Linux 4.9.0-3-amd64' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.9.0-3-amd64-advanced-/dev/sda1' {
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_msdos
echo 'Loading Linux 4.9.0-3-amd64 ...'
linux /boot/vmlinuz-4.9.0-3-amd64 root=/dev/sda1 ro quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.9.0-3-amd64
}
menuentry 'Debian GNU/Linux, with Linux 4.9.0-3-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.9.0-3-amd64-recovery-/dev/sda1' {
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_msdos
echo 'Loading Linux 4.9.0-3-amd64 ...'
linux /boot/vmlinuz-4.9.0-3-amd64 root=/dev/sda1 ro single
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-4.9.0-3-amd64
}
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
*********************** END /boot/grub/grub.cfg
*********************** BEGIN /proc/mdstat
cat: /proc/mdstat: No such file or directory
*********************** END /proc/mdstat
*********************** BEGIN /dev/disk/by-id
total 0
lrwxrwxrwx 1 root root 9 Jun 30 13:37 ata-VMware_Virtual_IDE_CDROM_Drive_10000000000000000001 -> ../../sr0
*********************** END /dev/disk/by-id
*********************** BEGIN /dev/disk/by-uuid
total 0
lrwxrwxrwx 1 root root 10 Jun 30 13:39 e692d65c-6677-4123-8bef-5daa7edb1a52 -> ../../sda1
*********************** END /dev/disk/by-uuid
-- System Information:
Debian Release: 9.0
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-3-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages grub-common depends on:
ii gettext-base 0.19.8.1-2
ii libc6 2.24-11+deb9u1
ii libdevmapper1.02.1 2:1.02.137-2
ii libfreetype6 2.6.3-3.2
ii libfuse2 2.9.7-1
ii liblzma5 5.2.2-1.2+b1
Versions of packages grub-common recommends:
ii os-prober 1.75
Versions of packages grub-common suggests:
ii console-setup 1.164
pn desktop-base <none>
pn grub-emu <none>
pn multiboot-doc <none>
pn xorriso <none>
-- no debconf information
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