[1.2.16] Failed to initialize KVM & other internal errors

[jean-christophe manciot]

On Ubuntu Server 4.2.0-22-generic #27-Ubuntu SMP Thu Dec 17 22:57:08 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

sudo systemctl status libvirt-bin
● libvirt-bin.service - Virtualization daemon
   Loaded: loaded (/lib/systemd/system/libvirt-bin.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2015-12-21 09:47:02 CET; 3s ago
     Docs: man:libvirtd(8)
           http://libvirt.org
 Main PID: 20980 (libvirtd)
   CGroup: /system.slice/libvirt-bin.service
           └─20980 /usr/sbin/libvirtd

Dec 21 09:47:02 msi-ge60-ubuntu libvirtd[20980]: libvirt version: 1.2.16, package: 1.2.16-2ubuntu11.15.10.1
Dec 21 09:47:02 msi-ge60-ubuntu libvirtd[20980]: internal error: Unknown qemu capabilities flag vhost-user-multiqueue
Dec 21 09:47:03 msi-ge60-ubuntu libvirtd[20980]: internal error: QEMU / QMP failed: Could not access KVM kernel module: Permission denied
                                                 failed to initialize KVM: Permission denied
Dec 21 09:47:03 msi-ge60-ubuntu libvirtd[20980]: Failed to probe capabilities for /usr/bin/kvm: internal error: QEMU / QMP failed: Could not access KVM kernel module: Permission denied
                                                 failed to initialize KVM: Permission denied
Dec 21 09:47:03 msi-ge60-ubuntu libvirtd[20980]: internal error: Unknown qemu capabilities flag vhost-user-multiqueue
Dec 21 09:47:03 msi-ge60-ubuntu libvirtd[20980]: internal error: QEMU / QMP failed: Could not access KVM kernel module: Permission denied
                                                 failed to initialize KVM: Permission denied
Dec 21 09:47:03 msi-ge60-ubuntu libvirtd[20980]: Failed to probe capabilities for /usr/bin/kvm: internal error: QEMU / QMP failed: Could not access KVM kernel module: Permission denied
                                                 failed to initialize KVM: Permission denied
Dec 21 09:47:03 msi-ge60-ubuntu libvirtd[20980]: error creating bridge interface virbr0: File exists
Hint: Some lines were ellipsized, use -l to show in full.

[jean-christophe manciot (manciot-jeanchristophe)]

grep libvirt /etc/group
libvirtd:x:1001:actionmystique

kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used

[jean-christophe manciot (manciot-jeanchristophe)]

I use qemu 2.5.0

[Serge Hallyn (serge-hallyn)]

Are you running libvirt 1.2.21-2ubuntu1 or 1.2.21-2ubuntu2, or a custom built version?

Is the qemu version hand-built?

What does 'ls -l /dev/kvm' show?

[jean-christophe manciot (manciot-jeanchristophe)]

Thanks for the quick answer.

I've installed libvirt-bin 1.2.16 from official repo.

I've just found a workaround in /etc/libvirt/qemu.conf:

user= "root"
group= "root"

I'm not sure why we have to specify these now:

 systemctl status libvirt-bin
● libvirt-bin.service - Virtualization daemon
   Loaded: loaded (/lib/systemd/system/libvirt-bin.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2015-12-21 19:22:28 CET; 1s ago
     Docs: man:libvirtd(8)
           http://libvirt.org
 Main PID: 10758 (libvirtd)
   CGroup: /system.slice/libvirt-bin.service
           ├─10758 /usr/sbin/libvirtd
           ├─32126 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leases...
           └─32129 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leases...

Dec 21 19:22:28 msi-ge60-ubuntu systemd[1]: Starting Virtualization daemon...
Dec 21 19:22:28 msi-ge60-ubuntu systemd[1]: Started Virtualization daemon.
Dec 21 19:22:28 msi-ge60-ubuntu dnsmasq[32126]: read /etc/hosts - 11 addresses
Dec 21 19:22:28 msi-ge60-ubuntu dnsmasq[32126]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Dec 21 19:22:28 msi-ge60-ubuntu dnsmasq-dhcp[32126]: read /var/lib/libvirt/dnsmasq/default.hostsfile

[Serge Hallyn (serge-hallyn)]

Quoting jean-christophe manciot (<email address hidden>):
> Thanks for the quick answer.
>
> I've installed libvirt-bin 1.2.16 from official repo.
>
> I've just found a workaround in /etc/libvirt/qemu.conf:
>
> user= "root"
> group= "root"
>
> I'm not sure why we have to specify these now:

Does ls -l /dev/kvm show

crw-rw---- 1 root kvm 10, 232 Dec 20 02:26 /dev/kvm

?

[jean-christophe manciot (manciot-jeanchristophe)]

ls -al /dev/kvm
crw-rw----+ 1 root root 10, 232 Dec 21 18:57 /dev/kvm

[Serge Hallyn (serge-hallyn)]

Right this is a result of not having installed a package which
reset the /dev/kvm ownershpi and perms for you. Please restart libvirt after
doing

chgrp kvm /dev/kvm
chmod g+rw /dev/kvm

[Launchpad Janitor (janitor)]

[Expired for libvirt (Ubuntu) because there has been no activity for 60 days.]

[Ishmael (ishmaelt3)]

Hi,

if there is anyone to assist, please do so as I have compile libvirt and getting errors when starting up

root@saw:/home/ishmael/libvirt-1.3.4# /etc/init.d/libvirt-bin start
[....] Starting libvirt-bin (via systemctl): libvirt-bin.serviceJob for libvirt-bin.service failed because a timeout was exceeded. See "systemctl status libvirt-bin.service" and "journalctl -xe" for details.
 failed!

systemctl status libvirt-bin

May 13 15:10:33 saw libvirtd[31050]: Failed to probe capabilities for /usr/bin/kvm: internal error: QEMU / QMP failed: Could not access KVM kernel module: No such file or directory
                                     failed to initialize KVM: No such file or directory

[Serge Hallyn (serge-hallyn)]

Please show the output of the two commands shown in the log message.