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Incident report — gpu-01 NCCL stall

Summary

Multi-node all-reduce on tenant-foo's training run hung for 8 minutes before failing on rank 3.

Timeline

Time (UTC)	Event
14:02	Job submitted (4 nodes × 8 H100)
14:03	All ranks reported `NCCL INFO Channel 00`
14:11	rank3 logs `NCCL INFO Bootstrap : connect` retry storm

Root cause

gpu-04: ibstat | grep -i 'state\|rate'
  State: Active
  Rate: 200 Gbps

…but gpu-04 mlx5_3 reported State: Down. NCCL was bound to that rail via NCCL_IB_HCA=mlx5_0,mlx5_1,mlx5_2,mlx5_3 and could not fail over.

Action: rotate gpu-04 for HCA replacement.