nova/releasenotes/notes/bug-1894804-bef8703f8364f9a...

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---
fixes:
- |
`bug 1882521`_ has now been resolved by increasing the incremental
and max sleep times between device detach attempts. This works around some
undefined QEMU behaviour documented in `bug 1894804`_ where overlapping
``device_del`` requests would cancel the initial call leading to a
situation where the device was never detached fully.
.. _bug 1882521: https://bugs.launchpad.net/nova/+bug/1882521
.. _bug 1894804: https://bugs.launchpad.net/qemu/+bug/1894804