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Debugging Audio Artifacts Caused by a Serial Port?

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Chris Constantine from Recall.ai details the troubleshooting process of a peculiar bug causing audio artifacts in their system. After a rapid growth in infrastructure, their migration away from Kubernetes resulted in customers hearing popping noises in captured audio. A complex debugging journey led to identifying excessive debug logs as the source, overwhelming a virtual serial device and inadvertently starving the CPU required for clear audio processing.

  • Recall.ai handles millions of meetings per month.
  • Cluster scales over 10,000 VMs.
  • Migration from Kubernetes to a custom scaler.
  • Audio artifacts appeared after cluster migration.
  • Excessive logging to virtual serial port caused CPU issues.