I'm at a tad late (5+ years after the last comment), but in case it
helps, we just ran into a situation where a user (not cloud admin)
exhausted their IP allocations in a user-defined subnet, which caused an
error in the nova-compute.log:

NoMoreFixedIps: No fixed IP addresses available for network:
62c7b2e2-4406-4dda-9a01-f0ec623335d4

which caused the BuildFailureWeigher to offset the weight by -1000000.

This was in a Stein cluster, so quite old.  A newer version may have
this disabled by default, but we had to manually disable it.
Regardless, it caused all other tenants' VM deployments to fail since
every compute node that tried to deploy the above VM resulted in the
above error, causing each compute node to be assigned a large negative
weight.

Just wanted to mention our experience in case it helped someone else who
was searching for the problem.

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https://bugs.launchpad.net/bugs/1818239

Title:
  scheduler: build failure high negative weighting

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