Hi,
Both of our physical hardware based appliances failed the automatic upgrade to version 11.9 both with same errror message, I rebooted the appliances, but still the same issue
it looks like some type of mount issue
System update failed with following message:
+++ dirname /var/urbackup/firmware_update_10/apply.sh
++ cd /var/urbackup/firmware_update_10
++ pwd
- DIR=/var/urbackup/firmware_update_10
++ cat /var/urbackup/firmware_update_10/firmware_version - CURRENT_VERSION=11.9
++ cat /firmware_type - FIRMWARE_TYPE=amd64
 - mkdir -p /media/fs
 - test -e /media/fs/sys_root_current
 - test -e /root_device
++ cat /root_device - ROOT_DEV=/dev/disk/by-uuid/e5c687e3-8188-426c-9f46-d4d1173ade34
 - mount /dev/disk/by-uuid/e5c687e3-8188-426c-9f46-d4d1173ade34 /media/fs -o defaults,noatime,compress-force=lzo
 - mount
 - grep /media/fs
 - grep zstd
 - mount -o remount,compress-force=zstd /media/fs
 - mount
 - grep /media/fs
 - grep zstd:15
 - mount -o remount,compress-force=zstd:15 /media/fs
 - exists ‘/boot/*.new’
 - [[ -e /boot/*.new ]]
 - [[ amd64 != \r\p\i\4 ]]
++ wc -l
++ ls /boot/vmlinuz-5.10.103 /boot/vmlinuz-5.10.128 - NUM_OLD_KE RNELS=2
 - KERNEL_NUM=0
++ sort --version-sort
++ ls /boot/vmlinuz-5.10.103 /boot/vmlinuz-5.10.128 - for i in 
ls /boot/vmlinuz-* | sort --version-sort - KERNEL_NUM=1
 - ‘[’ 1 -ge 2 ‘]’
 - VER=5.10.103
 - rm /boot/System.map-5.10.103
 - true
 - rm /boot/System.map-5.10.103.xz
 - true
 - rm /boot/config-5.10.103
 - true
 - rm /boot/config-5.10.103.xz
 - rm /boot/initrd.img-5.10.103
 - rm /boot/vmlinuz-5.10.103
 - for i in 
ls /boot/vmlinuz-* | sort --version-sort - KERNEL_NUM=2
 - ‘[’ 2 -ge 2 ‘]’
 - break
 - BOOT_FILES=‘zImage zImageXU4 kernel8.img cmdline.txt vmlinuz-5.10.172 config-5.10.172.xz initrd.img-5.10.172 grublegacy.cfg grub/grub.cfg fixup.dat fixup_cd.dat fixup_db.dat fixup_x.dat fixup4.dat fixup4cd.dat fixup4db.dat fixup4x.dat start.elf start_cd.elf start_db.elf start_x.elf start4.elf start4cd.elf start4db.elf start4x.elf’
 - HAS_BOOT_FILE=no
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/zImage< br>+ for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/zImageXU4
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/kernel8.img
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/cmdline.txt
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/vmlinuz-5.10.172
 - HAS_BOOT_FILE=yes
 - cp /var/urbackup/firmware_update_10/vmlinuz-5.10.172 /boot/vmlinuz-5.10.172.new
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/config-5.10.172.xz
 - HAS_BOOT_FILE=yes
 - cp /var/urbackup/firmware_update_10/config-5.10.172.xz /boot/config-5.10.172.xz.new
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/initrd.img-5.10.172
 - HAS_BOOT_FILE=yes
 - cp /var/urbackup/firmware_update_10/initrd.img-5.10.172 /boot/initrd.img-5.10.172.new
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/grublegacy.cfg
 - HAS_BOOT_FILE=yes
 - cp /var/urbackup/fi rmware_update_10/grublegacy.cfg /boot/grublegacy.cfg.new
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/grub/grub.cfg
 - HAS_BOOT_FILE=yes
 - cp /var/urbackup/firmware_update_10/grub/grub.cfg /boot/grub/grub.cfg.new
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup_cd.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup_db.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup_x.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4cd.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4db.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4x.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_ 10/start.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start_cd.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start_db.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start_x.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4cd.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4db.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4x.elf
++ shopt -s nullglob
++ echo - test -n ‘’
 - test -e /var/urbackup/firmware_update_10/overlays
 - ‘[’ -e /cloud-mode ‘]’
 - ‘[’ -e /boot/grub/grub.cfg.new ‘]’
 - ‘[’ -e /var/urbackup/mitigations_off ‘]’
 - ‘[’ -e /boot/grublegacy.cfg.new ‘]’
 - ‘[’ -e /var/urbackup/mitigations_off ‘]’
 - ‘[’ yes = yes ‘]’
 - syncfs /boot
 - sync -f /boot
 - for fn in $BOO T_FILES
 - test -e /var/urbackup/firmware_update_10/zImage
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/zImageXU4
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/kernel8.img
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/cmdline.txt
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/vmlinuz-5.10.172
 - mv -f /boot/vmlinuz-5.10.172.new /boot/vmlinuz-5.10.172
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/config-5.10.172.xz
 - mv -f /boot/config-5.10.172.xz.new /boot/config-5.10.172.xz
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/initrd.img-5.10.172
 - mv -f /boot/initrd.img-5.10.172.new /boot/initrd.img-5.10.172
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/grublegacy.cfg
 - mv -f /boot/grublegacy.cfg.new /boot/grublegacy.cfg
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_ 10/grub/grub.cfg
 - mv -f /boot/grub/grub.cfg.new /boot/grub/grub.cfg
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup_cd.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup_db.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup_x.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4cd.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4db.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/fixup4x.dat
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start_cd.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/st art_db.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start_x.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4cd.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4db.elf
 - for fn in $BOOT_FILES
 - test -e /var/urbackup/firmware_update_10/start4x.elf
++ shopt -s nullglob
++ echo - test -n ‘’
 - test -e /var/urbackup/firmware_update_10/overlays
 - ‘[’ yes = yes ‘]’
 - syncfs /boot
 - sync -f /boot
 - ‘[’ yes = yes ‘]’
 - exists /boot/vmlinuz-5.10.128 /boot/vmlinuz-5.10.172
 - [[ -e /boot/vmlinuz-5.10.128 ]]
 - chmod +r /boot/vmlinuz-5.10.128 /boot/vmlinuz-5.10.172
 - test -e /media/fs/sys_root_v11.9
 - test -e /media/fs/sys_etc_v11.9
 - cat /var/urbackup/firmware_update_10/root_update.btrfs.xz
 - xz -d
 - btrfs receive /media/fs
ERROR: cannot find parent subvolume - test -e /media/fs/sys_root_v11.9
 - exit 1