While testing >=v5.0.0 on Fedora 32 I've stumbled across the following
change in QEMU:

https://github.com/qemu/qemu/commit/cce8944cc9efab47d4bf29cfffb3470371c3541b

The change suggests that previously parallel requests to detach a PCIe
device (such as virtio-blk) from QEMU would result in the original
request being cancelled. We are hitting the above check and error with
v5.0.0 in OpenStack CI that made me wonder if we are hitting the
original issue in this bug where QEMU is < v5.0.0?

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https://bugs.launchpad.net/bugs/1894804

Title:
  Second DEVICE_DELETED event missing during virtio-blk disk device
  detach

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