Comment 2 for bug 1916927

For test_network_policy I recommend the following changes:
1) Add --request-timeout=1m to the `kubectl exec` calls.
2) Use ssh instead of unit.run to prevent it from acquiring the machine lock (which can prevent the debug action from running).

I have also requested changes to juju-crashdump that would help us diagnose future failures in more detail:
1) https://github.com/juju/juju-crashdump/issues/81
2) https://github.com/juju/juju-crashdump/issues/82