Public bug reported:
Most of xen functionalities required modules that are in the linux-image-extra
package but no dependency (even indirect) exists between xen packages and
linux-image-extra-*-generic.
e.g :
As soon as block devices are uses in domU, xen requires the xen_blkback
module which is in linux-image-extra package.
to reproduce the bug :
sdo apt-get install linux-image-extra-4.4.0-22-generic xen-system-amd64
create a domU configuration using a phy: disk (tested with lvm)
test.cfg :
-----
kernel = '/vmlinuz'
ramdisk = '/initrd.img'
vcpus = '1'
memory = '512'
root = '/dev/xvda2 ro'
disk = [
'/dev/vg/testlv,raw,xvda2,w',
]
name = 'test'
-----
boot the domU
sudo xl create test.cfg
stop the domU
sudo apt-get remove linux-image-extra-4.4.0-22-generic
reboot dom0 to ensure xen modules are unloaded
try to boot the domU
the domU fails to boot with
libxl: error: libxl_device.c:952:device_backend_callback: unable to add device
with path /local/domain/0/backend/vbd/1/51714
Please add this missing dependency.
** Affects: xen (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1580083
Title:
missing dependency on linux-image-extra leads to unbootable domU using
block devices
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