Public bug reported:
THis came up when analyzing https://bugs.launchpad.net/nova/+bug/1371677
and there is a lot information on there. The bug in short is that
_get_instance_disk_info will rely on db information to filter out the
volumes from the list of discs it gets from libvirt XML, but due to the
async nature of unplug - this can still contain a volume that does not
exist in the DB and will not be filtered out, so the code will assume
it's an lvm image and do a blockdev on it which can block for a very
long time.
The solution is to NOT use libvirt XML in this particular case (but
anywhere in Nova really) to find out information about running
instances.
** Affects: nova
Importance: High
Status: New
** Tags: libvirt
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https://bugs.launchpad.net/bugs/1375868
Title:
libvirt: race between hot unplug and XMLDesc in
_get_instance_disk_info
Status in OpenStack Compute (Nova):
New
Bug description:
THis came up when analyzing
https://bugs.launchpad.net/nova/+bug/1371677 and there is a lot
information on there. The bug in short is that _get_instance_disk_info
will rely on db information to filter out the volumes from the list of
discs it gets from libvirt XML, but due to the async nature of unplug
- this can still contain a volume that does not exist in the DB and
will not be filtered out, so the code will assume it's an lvm image
and do a blockdev on it which can block for a very long time.
The solution is to NOT use libvirt XML in this particular case (but
anywhere in Nova really) to find out information about running
instances.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1375868/+subscriptions
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