Public bug reported:
When I try to revert to a previous state from the grub menu, the boot
fails. The system drops me to a repair modus.
zfs-mount-generator fails with the message:
couldn't ensure boot: Mounted clone bootFS dataset created by initramfs doesn't
have a valid _suffix (at least .*_<onechar>): \"rpool/ROOT/ubuntu_\"".
After a reboot I have an extra clone called "rpool/ROOT/ubuntu_", indeed
without a suffix.
After a little investigation I found the problem in
/usr/share/initramfs-tools/scripts/zfs at the end in function
uid()
{
dd if=/dev/urandom of=/dev/stdout bs=1 count=100 2>/dev/null | tr -dc
'a-z0-9' | cut -c-6
}, the dd command fails during boot with the message "process 'dd' started with
executable stack.
After this an empty uid is returned which explains the dataset without a proper
suffix.
Replacing the function with:
uid()
{
grep -a -m10 -E "\*" /dev/urandom 2>/dev/null | tr -dc 'a-z0-9' | cut -c-6
}
fixes the problem.
Ubuntu version is:
Description: Ubuntu Groovy Gorilla (development branch)
Release: 20.10
zfs-initramfs version is:
0.8.4-1ubuntu11
With regards,
Usarin Heininga
ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: zfs-initramfs 0.8.4-1ubuntu11
ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
Uname: Linux 5.8.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Fri Sep 4 20:23:44 2020
InstallationDate: Installed on 2020-09-02 (2 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200831)
ProcEnviron:
LANGUAGE=
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=nl_NL.UTF-8
SHELL=/bin/bash
SourcePackage: zfs-linux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug groovy
** Patch added: "zfs_patch"
https://bugs.launchpad.net/bugs/1894329/+attachment/5407720/+files/zfs_patch
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https://bugs.launchpad.net/bugs/1894329
Title:
ZFS revert from grub menu not working.
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