I'm having the same problem with Ubuntu 20.4 after update my kernel.
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https://bugs.launchpad.net/bugs/1635115
Title:
grub fails zfs root filesystem detection due to failed checksum
Status in grub2 package in Ubuntu:
Confirmed
Status in zfs-linux package in Ubuntu:
Won't Fix
Bug description:
root@q-1-d.sv1:~# lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
root@q-1-d.sv1:~# apt-cache policy grub2-common
grub2-common:
Installed: 2.02~beta2-36ubuntu3.2
Candidate: 2.02~beta2-36ubuntu3.2
Version table:
*** 2.02~beta2-36ubuntu3.2 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
100 /var/lib/dpkg/status
2.02~beta2-36ubuntu3 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
I followed https://github.com/zfsonlinux/zfs/wiki/Ubuntu-16.04-Root-on-ZFS to
make a ZFS native root disk system.
Installation went fine, systems works like a champ... but then, after
a while, it's time to apt-get update ; apt-get upgrade to update my
kernel. That apt-get install fails because grub can't detect it's
root file system:
root@q-2-d.sv1:~# grub-probe /
grub-probe: error: unknown filesystem.
Strange, this use to work. Add in a -vv and I see:
grub-core/kern/fs.c:56: Detecting zfs...
grub-core/osdep/hostdisk.c:415: opening the device `/dev/sda1' in
open_device()
grub-core/fs/zfs/zfs.c:1192: label ok 0
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:1007: check 2 passed
grub-core/fs/zfs/zfs.c:1018: check 3 passed
grub-core/fs/zfs/zfs.c:1025: check 4 passed
grub-core/fs/zfs/zfs.c:1035: check 6 passed
grub-core/fs/zfs/zfs.c:1043: check 7 passed
grub-core/fs/zfs/zfs.c:1054: check 8 passed
grub-core/fs/zfs/zfs.c:1064: check 9 passed
grub-core/fs/zfs/zfs.c:1086: check 11 passed
grub-core/fs/zfs/zfs.c:1112: check 10 passed
grub-core/fs/zfs/zfs.c:1128: str=com.delphix:hole_birth
grub-core/fs/zfs/zfs.c:1128: str=com.delphix:embedded_data
grub-core/fs/zfs/zfs.c:1137: check 12 passed (feature flags)
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 2048/2048
grub-core/fs/zfs/zfs.c:1898: endian = -1
grub-core/fs/zfs/zfs.c:595: dva=8, b00258
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:442: checksum fletcher4 verification failed
grub-core/fs/zfs/zfs.c:447: actual checksum 00000059d95adad1 00006322fba304b3
00430f321ad7f439 21e873b51c15e3bc
grub-core/fs/zfs/zfs.c:452: expected checksum 000000035ca143fb
0000062fc3a48ff8 0005b49e0d96b07e 03841abf1fed586a
grub-core/fs/zfs/zfs.c:1919: incorrect checksum
grub-core/kern/fs.c:78: zfs detection failed.
Now here's the fun part. Rebooting the system will fix the checksum
issue for a short amount of time. Here is what it looks like
immediately after a reboot:
root@q-1-d.sv1:~# grub-probe /
zfs
grub-core/kern/fs.c:56: Detecting zfs...
grub-core/osdep/hostdisk.c:415: opening the device `/dev/sda1' in
open_device()
grub-core/fs/zfs/zfs.c:1192: label ok 0
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:1007: check 2 passed
grub-core/fs/zfs/zfs.c:1018: check 3 passed
grub-core/fs/zfs/zfs.c:1025: check 4 passed
grub-core/fs/zfs/zfs.c:1035: check 6 passed
grub-core/fs/zfs/zfs.c:1043: check 7 passed
grub-core/fs/zfs/zfs.c:1054: check 8 passed
grub-core/fs/zfs/zfs.c:1064: check 9 passed
grub-core/fs/zfs/zfs.c:1086: check 11 passed
grub-core/fs/zfs/zfs.c:1112: check 10 passed
grub-core/fs/zfs/zfs.c:1128: str=com.delphix:hole_birth
grub-core/fs/zfs/zfs.c:1128: str=com.delphix:embedded_data
grub-core/fs/zfs/zfs.c:1137: check 12 passed (feature flags)
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 2048/2048
grub-core/fs/zfs/zfs.c:1898: endian = -1
grub-core/fs/zfs/zfs.c:595: dva=8, c001c0
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:2678: endian = -1, blkid=0
grub-core/fs/zfs/zfs.c:2020: endian = -1
grub-core/fs/zfs/zfs.c:2051: endian = -1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = -1
grub-core/fs/zfs/zfs.c:595: dva=8, c001b8
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, c001a0
grub-core/fs/zfs/zfs.c:2682: alive
grub-core/fs/zfs/zfs.c:2493: looking for 'features_for_read'
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 200
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:2503: zap read
grub-core/fs/zfs/zfs.c:2516: fat zap
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, bb0c48
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:2276: fzap: length 18
grub-core/fs/zfs/zfs.c:2520: returned 0
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 512/512
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 70
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:2109: zap: name = org.illumos:lz4_compress, value = 1,
cd = 0
grub-core/fs/zfs/zfs.c:2109: zap: name = com.delphix:hole_birth, value = 1,
cd = 0
grub-core/fs/zfs/zfs.c:2109: zap: name = com.delphix:extensible_dataset,
value = 0, cd = 0
grub-core/fs/zfs/zfs.c:2109: zap: name = com.delphix:embedded_data, value =
1, cd = 0
grub-core/fs/zfs/zfs.c:2109: zap: name = org.open-zfs:large_blocks, value =
0, cd = 0
grub-core/fs/zfs/zfs.c:2109: zap: name = , value = 0, cd = 0
grub-core/fs/zfs/zfs.c:2109: zap: name = , value = 0, cd = 0
grub-core/fs/zfs/zfs.c:3250: alive
grub-core/fs/zfs/zfs.c:3062: endian = 1
grub-core/fs/zfs/zfs.c:2678: endian = 1, blkid=0
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2051: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, c001b8
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, c001a0
grub-core/fs/zfs/zfs.c:2682: alive
grub-core/fs/zfs/zfs.c:3069: alive
grub-core/fs/zfs/zfs.c:2493: looking for 'root_dataset'
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 200
grub-core/fs/zfs/zfs.c:2503: zap read
grub-core/fs/zfs/zfs.c:2516: fat zap
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, bb0c48
grub-core/fs/zfs/zfs.c:2276: fzap: length 13
grub-core/fs/zfs/zfs.c:2520: returned 0
grub-core/fs/zfs/zfs.c:3075: alive
grub-core/fs/zfs/zfs.c:3081: alive
grub-core/fs/zfs/zfs.c:3259: alive
grub-core/fs/zfs/zfs.c:3263: endian = 0
grub-core/fs/zfs/zfs.c:3272: endian = 1
grub-core/fs/zfs/zfs.c:3127: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 2048/2048
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 60
grub-core/fs/zfs/zfs.c:3352: endian = 1
grub-core/fs/zfs/zfs.c:3127: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 2048/2048
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 60
grub-core/fs/zfs/zfs.c:2678: endian = 1, blkid=0
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2051: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 50
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2051: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 48
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2051: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 40
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2051: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 38
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/sda1'
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2051: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 30
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2051: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 28
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 16384/4096
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 20
grub-core/fs/zfs/zfs.c:2682: alive
grub-core/fs/zfs/zfs.c:2493: looking for 'ROOT'
grub-core/fs/zfs/zfs.c:2020: endian = 1
grub-core/fs/zfs/zfs.c:2046: endian = 1
grub-core/fs/zfs/zfs.c:1875: zio_read: E 0: size 512/512
grub-core/fs/zfs/zfs.c:1898: endian = 1
grub-core/fs/zfs/zfs.c:595: dva=8, 0
grub-core/fs/zfs/zfs.c:2503: zap read
grub-core/fs/zfs/zfs.c:2507: micro zap
grub-core/fs/zfs/zfs.c:2510: returned 0
zfs
grub-core/kern/disk.c:295: Closing `hostdisk//dev/sda'.
I see this issue across many servers that's I've done this to.
Any help would be appreciated.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: grub2-common 2.02~beta2-36ubuntu3.2
ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
Uname: Linux 4.4.0-43-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Thu Oct 20 04:36:35 2016
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)
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