Based on UTAH code and on the assumptions made due to the debugging I
created a test script that tries to trigger the cleanup being concurrent
to the undefine calls.

I aran 600 loops - so far nothing triggered, so we miss some aspect of the 
original issue.
Maybe the reason/way qemu dies is different?
Maybe we need a case where libvirt writes to qemu on some of those streams?

Not sure yet, for now I enable a debugging log of libvirt on s1lp4 to
maybe get better insight this happens next time.

@paride - please ping me when it happens next time so we can check the logs
@paride - if anything comes to your mind how this guest abort could be 
different let me know

** Attachment added: "test script (not triggering it yet)"
   
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1822096/+attachment/5250194/+files/test.py

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https://bugs.launchpad.net/bugs/1822096

Title:
  libvirt hangs after utah workload is aborted

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