Incident Library?

Incident Library?

Symptom ?

Link flapping 링크 플래핑 · `link-flapping`

2 cases · 2024 to 2026

Root cause ?Dependency failure 2

Component ?InfiniBand fabric 2 NCCL 2 PyTorch 2 GPU driver 1

Contributing factor ?Monitoring blind spot 2 Unverified assumption 1 Unreviewed defaults 1 Partial rollout 1

Cases

IL-0023 A training run failed on an NCCL timeout from one brief InfiniBand port drop — Databricks, 2026, sev4
Root cause Dependency failure
IL-0025 Link flapping, hangs and slowdowns while bringing up a 4,088-GPU cluster — Imbue, 2024
Root cause Dependency failure

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