Xen project Mailing List

Hello, I have an Ubuntu 14.04 running Xen and a VM running Ubuntu 16.04 LTS that I'm having issues with it booting after upgrading the kernel for meltdown and spectre vulnerability.

````

sudo apt-get update

sudo apt-get upgrade

sudo apt-get dist-upgrade

````

Ubuntu 14.04 xen host reboot failure log:

````

$ tailf /var/log/xen/servername.log

Domain 24 needs to be cleaned up: destroying the domain

Done. Rebooting now

libxl: error: libxl_bootloader.c:628:bootloader_finished: bootloader failed - consult logfile /var/log/xen/bootloader.27.log

libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: bootloader [-1] exited with error status 1

libxl: error: libxl_create.c:1024:domcreate_rebuild_done: cannot (re-)build domain: -3

````

cat /var/log/xen/bootloader.27.log

Using <class 'grub.GrubConf.Grub2ConfigFile'> to parse /grub/grub.cfg pyGRUB version 0.6

┌────────────────────────────────────────────────────────────────────────┐

│ Ubuntu │

│ Ubuntu, with Linux 4.4.0-109-generic │

│ Ubuntu, with Linux 4.4.0-109-generic (recovery mode) │

│ Ubuntu, with Linux 4.4.0-108-generic │

│ Ubuntu, with Linux 4.4.0-108-generic (recovery mode) │

│ Ubuntu, with Linux 4.4.0-104-generic │

│ Ubuntu, with Linux 4.4.0-104-generic (recovery mode) │

│ Ubuntu, with Linux 4.4.0-15-generic │

└────────────────────────────────────────────────────────────────────────┘

Use the ^ and ┴ keys to select which entry is highlighted.

Press enter to boot the selected OS, 'e' to edit the

commands before booting, 'a' to modify the kernel arguments

before booting, or 'c' for a command line.

Traceback (most recent call last):

File "/usr/lib/xen-4.4/bin/pygrub", line 905, in <module>

os.write(fd, ostring)

OSError: [Errno 28] No space left on device

````

I was able to get the vm to boot only by rapidly attempt to access the menu options and boot the old kernel (4.4.0-15-generic). Disk space and inodes seems fine on the host Ubuntu 14.04LTS and Ubuntu 16.04LTS Guest.

Ubuntu 14.04 Host:

````

root@host:/var/log/xen# df -hFilesystem Size Used Avail Use% Mounted on

udev 197M 12K 197M 1% /dev

tmpfs 42M 1.1M 41M 3% /run

/dev/dm-0 104G 49G 50G 50% /

none 4.0K 0 4.0K 0% /sys/fs/cgroup

none 5.0M 0 5.0M 0% /run/lock

none 208M 0 208M 0% /run/shm

none 100M 0 100M 0% /run/user

/dev/sda1 236M 40M 184M 18% /boot

root@host:/var/log/xen# df -hi

Filesystem Inodes IUsed IFree IUse% Mounted on

udev 50K 721 49K 2% /dev

tmpfs 52K 849 52K 2% /run

/dev/dm-0 6.6M 86K 6.5M 2% /

none 52K 2 52K 1% /sys/fs/cgroup

none 52K 5 52K 1% /run/lock

none 52K 1 52K 1% /run/shm

none 52K 2 52K 1% /run/user

/dev/sda1 61K 298 61K 1% /boot

root@host:/var/log/xen#

````

Ubuntu 16.04 PV Guest:

````

root@guest:~# df -hFilesystem Size Used Avail Use% Mounted on

udev 950M 0 950M 0% /dev

tmpfs 200M 3.1M 197M 2% /run

/dev/mapper/guest--vg-root 47G 4.3G 40G 10% /

tmpfs 997M 0 997M 0% /dev/shm

tmpfs 5.0M 0 5.0M 0% /run/lock

tmpfs 997M 0 997M 0% /sys/fs/cgroup

/dev/xvda1 472M 192M 256M 43% /boot

tmpfs 200M 0 200M 0% /run/user/1000

root@www2:~# df -hi

Filesystem Inodes IUsed IFree IUse% Mounted on

udev 238K 406 237K 1% /dev

tmpfs 250K 491 249K 1% /run

/dev/mapper/guest--vg-root 3.0M 177K 2.8M 6% /

tmpfs 250K 1 250K 1% /dev/shm

tmpfs 250K 7 250K 1% /run/lock

tmpfs 250K 16 250K 1% /sys/fs/cgroup

/dev/xvda1 122K 315 122K 1% /boot

tmpfs 250K 4 250K 1% /run/user/1000

root@guest:~#

````

Here is the guest Ubuntu 16.04 OS kernels:

````

root@guest:~# dpkg -l | grep linux-image-

ii linux-image-4.4.0-104-generic 4.4.0-104.127 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP

ii linux-image-4.4.0-108-generic 4.4.0-108.131 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP

ii linux-image-4.4.0-109-generic 4.4.0-109.132 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP

ii linux-image-4.4.0-15-generic 4.4.0-15.31 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP

ii linux-image-extra-4.4.0-104-generic 4.4.0-104.127 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP

ii linux-image-extra-4.4.0-108-generic 4.4.0-108.131 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP

ii linux-image-extra-4.4.0-109-generic 4.4.0-109.132 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP

ii linux-image-extra-4.4.0-15-generic 4.4.0-15.31 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP

ii linux-image-generic 4.4.0.109.114 amd64 Generic Linux kernel image

root@guest:~#

````

I'm currently able to boot to 4.4.0-15.31

Here is my xen config file that I use to start the vm:

````

# cat /etc/xen/guest.cfg

# /var/lib/xen/images/ubuntu-netboot/xenial16LTS

name = "guest"

#kernel = "/var/lib/xen/images/ubuntu-netboot/xenial16LTS/vmlinuz"

#ramdisk = "/var/lib/xen/images/ubuntu-netboot/xenial16LTS/initrd.gz"

bootloader = "/usr/lib/xen-4.4/bin/pygrub"

memory = 2048

vcpus = 1

disk = [ '/dev/host-disk2-vg/guest-disk,raw,xvda,rw' ]

# Networking

vif = [ 'ip=xxx.xxx.xxx.xxx ,mac=AA:BB:CC:DD:EE:FF' ]

# Behaviour

_on_poweroff_ = 'destroy'

on_reboot = 'restart'

on_crash = 'restart'

````

I also tried launching the vm with strace output of

````

strace xl create -c file.cfg

````

is here: https://pastebin.com/8ctS3TQh

I'm a bit lost as to the cause of this... I was hoping to just upgrade the kernel for meltdown and spetre, but this issue I've never faced before. I think it might be related to pygrub and the new kernel? I don't know for sure though anything I can check to figure this out better? Thanks.

[Xen-users] Xen PV Guest won't boot latest kernel- OSError: [Errno 28] No space left on device