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releasenote: Add known issue for bug #1894804

Related-Bug: #1882521
Change-Id: Ib9059dde41b0a07144ffa26552577308b1ffc9e1
changes/54/752654/1
Lee Yarwood 1 year ago
parent
commit
57ac83d4d7
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      releasenotes/notes/bug-1894804-c03c20cd983c3192.yaml

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releasenotes/notes/bug-1894804-c03c20cd983c3192.yaml

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---
issues:
- |
`bug 1894804`_ documents a known device detachment issue with QEMU
``4.2.0`` as shipped by the Focal ``20.04`` Ubuntu release. This can lead
to the failure to detach devices from the underlying libvirt domain of an
instance as QEMU never emits the correct ``DEVICE_DELETED`` event to
libvirt. This in turn leaves the device attached within libvirt and
OpenStack Nova while it has been detached from the underlying QEMU process.
Subsequent attempts to detach the device will also fail as it is no longer
found within the QEMU process.
There is no known workaround within OpenStack Nova to this issue.
.. _bug 1894804: https://bugs.launchpad.net/qemu/+bug/1894804
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