releasenote: Add known issue for bug #1894804
Related-Bug: #1882521 Change-Id: Ib9059dde41b0a07144ffa26552577308b1ffc9e1
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releasenotes/notes/bug-1894804-c03c20cd983c3192.yaml
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releasenotes/notes/bug-1894804-c03c20cd983c3192.yaml
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---
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issues:
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- |
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`bug 1894804`_ documents a known device detachment issue with QEMU
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``4.2.0`` as shipped by the Focal ``20.04`` Ubuntu release. This can lead
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to the failure to detach devices from the underlying libvirt domain of an
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instance as QEMU never emits the correct ``DEVICE_DELETED`` event to
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libvirt. This in turn leaves the device attached within libvirt and
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OpenStack Nova while it has been detached from the underlying QEMU process.
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Subsequent attempts to detach the device will also fail as it is no longer
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found within the QEMU process.
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There is no known workaround within OpenStack Nova to this issue.
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.. _bug 1894804: https://bugs.launchpad.net/qemu/+bug/1894804
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