[nova] Nasty new gate regression as of 4/15 - bug 1825435
mriedemos at gmail.com
Fri Apr 19 13:22:04 UTC 2019
I spotted this yesterday  and according to logstash it showed up
around 4/15. It's only hitting on nova unit tests, and I think is
somehow related to the TestRPC unit tests, or maybe those just stall out
as a result when we hit the stack overflow.
I don't think it's due to any new oslo.config or oslo.messaging versions
because there haven't been any, and it hits on both the
lower-constraints and py36 jobs (so different versions of those packages).
I've looked through the nova changes that merged since around 4/14 but
nothing is jumping out at me that might be causing this stack overflow
in the oslo.config code, but the cells v1 removal patches are pretty big
and I'm wondering if something snuck through there - the cells v1 unit
tests were doing some RPC stuff as I recall so maybe that's related.
We need all eyes on this since it's a high failure rate and we're
already experiencing really slow turnaround times in the gate.
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