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Error grub-mkconfig with zfs and UEFI

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jarek.w
n00b
n00b

Joined: 15 Jun 2021
Posts: 10

Posted: Thu Sep 30, 2021 8:17 am Post subject: Error grub-mkconfig with zfs and UEFI

I got an error when I tried to generate new grub.cfg after a kernel upgrade:

Code:

# grub-mkconfig -o /boot/grub/grub.cfg

/usr/sbin/grub-probe: nvlist_lookup_string ("path"): No such file or directory

The problem is in the grub-probe. For example the same message is for:

Code:

# grub-probe --target=fs / -vv

grub-probe: info: cannot open `/boot/grub/device.map': No such file or directory.
grub-probe: nvlist_lookup_string ("path"): No such file or directory

When I changed the path parameter the problem disappeared:

Code:

# grub-probe --target=fs /boot

fat

I think the error comes from grub-core/osdep/unix/getroot.c in the grub2 project - https://git.savannah.gnu.org/git/grub.git

Code:

for (i = 0; i < nvlist_count; i++)
{
if (nvlist_lookup_string (children[i], "path", &device) != 0)
error (1, errno, "nvlist_lookup_string (\"path\")");

The grub-mkconfig works fine after I've changed the script (/usr/sbin/grub-mkconfig) from:

Code:

# Device containing our userland. Typically used for root= parameter.
GRUB_DEVICE="`${grub_probe} --target=device /`"

to:

Code:

# Device containing our userland. Typically used for root= parameter.
GRUB_DEVICE="`${grub_probe} --target=device /boot`"

But In my opinion it is an ugly workaround. Do I have a bad configuration or is this a bug in GRUB project?
I have zfs for the root partition and FAT32 for the boot partition. My configuration is:

Code:

# fdisk -l

Disk /dev/nvme0n1: 238.47 GiB, 256060514304 bytes, 500118192 sectors
Disk model: SAMSUNG MZALQ256HAJD-000L2
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 1F2F6212-531B-47C0-B49E-2895C5B62A65

Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 3147775 3145728 1.5G EFI System
/dev/nvme0n1p3 3147776 45090815 41943040 20G Linux filesystem
/dev/nvme0n1p4 45090816 53479423 8388608 4G Linux filesystem
/dev/nvme0n1p5 53479424 500116143 446636720 213G Linux filesystem

Disk /dev/sda: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000DM010-2EP1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: C93C0962-62B8-184A-A7E7-381565D0FB0A

Device Start End Sectors Size Type
/dev/sda1 2048 1953507327 1953505280 931.5G Solaris /usr & Apple ZFS
/dev/sda9 1953507328 1953523711 16384 8M Solaris reserved 1

Code:

# cat /etc/fstab

# <fs> <mountpoint> <type> <opts> <dump/pass>

/dev/cdrom /mnt/cdrom auto noauto,ro,user 0 0
/dev/nvme0n1p1 /boot vfat noauto,noatime 1 2
/dev/nvme0n1p3 none swap sw 0 0

Code:

# zpool status

pool: home_pool
state: ONLINE
config:

NAME STATE READ WRITE CKSUM
home_pool ONLINE 0 0 0
ata-ST1000DM010-2EP102_ZN1GQRSE ONLINE 0 0 0
logs
nvme-SAMSUNG_MZALQ256HAJD-000L2_S4ULNF0N449926-part4 ONLINE 0 0 0

errors: No known data errors

pool: rpool
state: ONLINE
scan: scrub repaired 0B in 00:00:22 with 0 errors on Mon Jul 5 09:00:23 2021
config:

NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
nvme-SAMSUNG_MZALQ256HAJD-000L2_S4ULNF0N449926-part5 ONLINE 0 0 0

errors: No known data errors

Code:

# zfs list

NAME USED AVAIL REFER MOUNTPOINT
home_pool 154G 745G 96K /home_pool
home_pool/HOME 154G 745G 96K none
home_pool/HOME/home 154G 745G 154G /home
rpool 21.9G 183G 96K /
rpool/ROOT 21.9G 183G 96K none
rpool/ROOT/rootfs 13.3G 183G 13.3G /
rpool/ROOT/var 8.54G 183G 8.54G /var

I modified the /etc/default/grub by adding a line

Code:

GRUB_CMDLINE_LINUX="root=ZFS=rpool/ROOT/rootfs"

The full file:

Code:

# cat /etc/default/grub

# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
#
# To populate all changes in this file you need to regenerate your
# grub configuration file afterwards:
# 'grub-mkconfig -o /boot/grub/grub.cfg'
#
# See the grub info page for documentation on possible variables and
# their associated values.

GRUB_DISTRIBUTOR="Gentoo"

# Default menu entry
#GRUB_DEFAULT=0

# Boot the default entry this many seconds after the menu is displayed
#GRUB_TIMEOUT=5
#GRUB_TIMEOUT_STYLE=menu

# Append parameters to the linux kernel command line
GRUB_CMDLINE_LINUX="root=ZFS=rpool/ROOT/rootfs"

#
# Examples:
#
# Boot with network interface renaming disabled
# GRUB_CMDLINE_LINUX="net.ifnames=0"
#
# Boot with systemd instead of sysvinit (openrc)
# GRUB_CMDLINE_LINUX="init=/usr/lib/systemd/systemd"

# Append parameters to the linux kernel command line for non-recovery entries
#GRUB_CMDLINE_LINUX_DEFAULT=""

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal.
# Note that you can use only modes which your graphic card supports via VBE.
# You can see them in real GRUB with the command `vbeinfo'.
#GRUB_GFXMODE=640x480

# Set to 'text' to force the Linux kernel to boot in normal text
# mode, 'keep' to preserve the graphics mode set using
# 'GRUB_GFXMODE', 'WIDTHxHEIGHT'['xDEPTH'] to set a particular
# graphics mode, or a sequence of these separated by commas or
# semicolons to try several modes in sequence.
#GRUB_GFXPAYLOAD_LINUX=

# Path to theme spec txt file.
# The starfield is by default provided with use truetype.
# NOTE: when enabling custom theme, ensure you have required font/etc.
#GRUB_THEME="/boot/grub/themes/starfield/theme.txt"

# Background image used on graphical terminal.
# Can be in various bitmap formats.
#GRUB_BACKGROUND="/boot/grub/mybackground.png"

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to kernel
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY=true

# Uncomment to disable generation of the submenu and put all choices on
# the top-level menu.
# Besides the visual affect of no sub menu, this makes navigation of the
# menu easier for a user who can't see the screen.
#GRUB_DISABLE_SUBMENU=y

# Uncomment to play a tone when the main menu is displayed.
# This is useful, for example, to allow users who can't see the screen
# to know when they can make a choice on the menu.
#GRUB_INIT_TUNE="60 800 1"

alamahant
Advocate

Joined: 23 Mar 2019
Posts: 3879

Posted: Thu Sep 30, 2021 9:23 am Post subject:

Hi
zfs looses symlinks.
Could all this be caused by a broken symlink some place?
was your rpool created with

Code:

-O dnodesize=auto -O normalization=formD -O relatime=on -O xattr=sa

?
I found if you use this you will not have a problem with broken symlinks.
Just a thought..........
_________________

jarek.w
n00b
n00b

Joined: 15 Jun 2021
Posts: 10

Posted: Thu Sep 30, 2021 10:20 am Post subject:

Hi, thank you for your response.
The only difference in the attributes is a value of the relatime. For rpool the values are:

Code:

$ zfs get all rpool | grep "dnodesize\|normalization\|atime\|xattr"

rpool atime off local
rpool xattr sa local
rpool normalization formD -
rpool dnodesize auto local
rpool relatime off default

but for the root file system volume the relatime is on:

Code:

$ zfs get all rpool/ROOT/rootfs | grep "dnodesize\|normalization\|atime\|xattr"

rpool/ROOT/rootfs atime off inherited from rpool
rpool/ROOT/rootfs xattr sa inherited from rpool
rpool/ROOT/rootfs normalization formD -
rpool/ROOT/rootfs dnodesize auto inherited from rpool
rpool/ROOT/rootfs relatime on temporary

I tried to find any broken symlinks with

Code:

find / -xtype l -print

but I found only in the proc fs like :

Code:

/proc/2/task/2/exe
/proc/2/exe
...

in /run like:

Code:

/run/udev/watch/65
...

and two more in the home_pool:
/home/user/.thunderbird/xxxxx.default-release/lock
/home/user/.mozilla/firefox/xxxxx.default-esr/lock

Should I change the value of the relatime for the rpool?

alamahant
Advocate

Joined: 23 Mar 2019
Posts: 3879

Posted: Thu Sep 30, 2021 3:47 pm Post subject:

Not likely being the cause.
Maybe re-emerge and reinstall grub making sure it is built with USE="libzfs"
But before you do that just try

Code:

ZPOOL_VDEV_NAME_PATH=1 grub-mkconfig -o /boot/grub/grub.cfg

if it works no need to reemerge grub just add

Code:

export ZPOOL_VDEV_NAME_PATH=YES

in /etc/profile
plz see
https://openzfs.github.io/openzfs-docs/Getting%20Started/Arch%20Linux/Root%20on%20ZFS/5-bootloader.html#apply-workarounds
_________________

jarek.w
n00b
n00b

Joined: 15 Jun 2021
Posts: 10

Posted: Fri Oct 01, 2021 5:40 am Post subject:

Unfortunately setting the variable ZPOOL_VDEV_NAME_PATH doesn't work:

Code:

# ZPOOL_VDEV_NAME_PATH=1 grub-mkconfig -o /boot/grub/grub.cfg

/usr/sbin/grub-probe: nvlist_lookup_string ("path"): No such file or directory

# ZPOOL_VDEV_NAME_PATH=YES grub-mkconfig -o /boot/grub/grub.cfg

/usr/sbin/grub-probe: nvlist_lookup_string ("path"): No such file or directory

It seems that GRUB is built with USE="libzfs":

Code:

$ equery u grub
[ Legend : U - final flag setting for installation]
[ : I - package is installed with flag ]
[ Colors : set, unset ]
* Found these USE flags for sys-boot/grub-2.06-r1:
U I
- - device-mapper : Enable support for device-mapper from sys-fs/lvm2
- - doc : Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of
globally
- - efiemu : Build and install the efiemu runtimes
+ + fonts : Build and install fonts for the gfxterm module
- - grub_platforms_coreboot : Coreboot platform support
- - grub_platforms_efi-32 : EFI 32 bit platform support (Old MACs)
+ + grub_platforms_efi-64 : EFI 64 bit platform support
- - grub_platforms_emu : Emulation platform support
- - grub_platforms_ieee1275 : IEEE1275 platform support
- - grub_platforms_loongson : MIPS loongson platform support
- - grub_platforms_multiboot : Multiboot platform support
- - grub_platforms_pc : PC platform support
- - grub_platforms_qemu : QEMU platform support
- - grub_platforms_qemu-mips : QEMU MIPS platform support
- - grub_platforms_uboot : U-Boot platform support
- - grub_platforms_xen : XEN (pvgrub2) platform support
- - grub_platforms_xen-32 : Build 32-bit XEN (pvgrub2) platform support on amd64
- - grub_platforms_xen-pvh : XEN (pvhgrub2) platform support
+ + libzfs : Enable support for sys-fs/zfs
- - mount : Build and install the grub-mount utility
+ + nls : Add Native Language Support (using gettext - GNU locale utilities)
- - sdl : Add support for Simple Direct Layer (media library)
+ + themes : Build and install GRUB themes (starfield)
- - truetype : Build and install grub-mkfont conversion utility

I will try to upgrade the system and recompile GRUB.

alamahant
Advocate

Joined: 23 Mar 2019
Posts: 3879

Posted: Fri Oct 01, 2021 9:44 am Post subject:

Can you plz try

Code:

zpool set bootfs=rpool/ROOT/rootfs rpool

_________________

jarek.w
n00b
n00b

Joined: 15 Jun 2021
Posts: 10

Posted: Fri Oct 01, 2021 10:54 am Post subject:

Thank you very much for your help. I've already done the folowing things:

upgraded the system,
rebuilt grub,
set bootfs property and ZPOOL_VDEV_NAME_PATH env

but the grub-mkconfig still cannot generate the grub.cfg. Still it shows the same error.
Thanks for the link

alamahant wrote:

plz see
https://openzfs.github.io/openzfs-docs/Getting%20Started/Arch%20Linux/Root%20on%20ZFS/5-bootloader.html#apply-workarounds

I have a similar problem with setting the root property in kernel cmdline. That is why I added a following line in /etc/default/grub.

Code:

GRUB_CMDLINE_LINUX="root=ZFS=rpool/ROOT/rootfs"

My kernel cmdline is:

Code:

linux /vmlinuz-5.10.61-gentoo root=UUID=C5CE-86ED ro root=ZFS=rpool/ROOT/rootfs

So I think it is connected.

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