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On a recent dogfood update we ran into an illumos kernel bug: oxidecomputer/opte#758
This bug appears to be triggered by sled-agent doing a combination of reading kstats (oximeter) and creating or deleting XDEs (OPTE ports) at the same time. Our plan is to put in place a workaround for r17: add a lock within sled-agent which makes it so that we don't read kstats and create/delete OPTE ports at the same time.
TODO:
- Write workaround
- Test the workaround
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