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[GH-ISSUE #1055] [Bug]: Worker: Process failed for slice #346
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kvcache-ai/Mooncake#346
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Originally created by @BilyZ98 on GitHub (Nov 13, 2025).
Original GitHub issue: https://github.com/kvcache-ai/Mooncake/issues/1055
Bug Report
I started 8 vll instances and run vllm benchmark. and got this transport retry counter exceeded error in P/D separation testing. 4 prefill node and 4 decode node. Why is it happen?
The source code is in worker_pool.cpp.
Command to start the benchmark script
MODEL=./Qwen2-7B-Instruct bash ./benchmarks.sh
mooncake.json
prefill started log
prefill error log
Before submitting...
@ShangmingCai commented on GitHub (Nov 13, 2025):
Try
export MC_MS_AUTO_DISC=0?@BilyZ98 commented on GitHub (Nov 13, 2025):
Thanks for reply. This helps solve the ib transport retyr counter exceeded error.
Do you know how to fix issues above if I set to use infiniband NIC ?
What changes should I make if I set mooncake.json like this ?
The error above occurs as well if I set to use rdma protocol and ib NIC.
@ShangmingCai commented on GitHub (Nov 13, 2025):
Use
show_gidsandnvidia-smi topo -mto get ib and topo info and paste them to LLM to let it help you find the right device_name config.@XiaotaoChen commented on GitHub (Nov 17, 2025):
@BilyZ98 Hi, have you solve the error? I try sglang remote-instance with
transfer-enginebackend, raise the same error. detail info as: https://github.com/sgl-project/sglang/issues/13380 shows. And exportexport MC_MS_AUTO_DISC=0didnt't work. Do you have any advices?@BilyZ98 commented on GitHub (Nov 21, 2025):
Hi @XiaotaoChen ,
I checked the link you gave and saw that you saw this issue by passing
mlx5_0into initialize function. Can you tell me which file that function is located at ?I did not find the file that includes that function
remote_instance_transfer_engine.initialize@BilyZ98 commented on GitHub (Nov 21, 2025):
I tried this config with 4 gpus and it works fine without reporting worker failed for slice error.
@github-actions[bot] commented on GitHub (Jun 19, 2026):
This issue has had no activity for 90 days and will be closed in 7 days if there is no further activity. Please comment or react if it should stay open.
@github-actions[bot] commented on GitHub (Jun 26, 2026):
Closing due to 3 months of inactivity. If this is still relevant, please comment and we can reopen.