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[Bug]: CUDA illegal memory access with CUDA graphs enabled under high concurrency (Qwen3.5-35B-A3B, tp=2)

Status: Open.

#39025 In vllm-project/vllm;

· vibhavagarwal5 opened on Apr 5, 2026

[Bug][MoE] DeepEP HT hardcodes per_act_token_quant=False, causing crash/accuracy loss

Status: Open.

#39022 In vllm-project/vllm;

· thc1006 opened on Apr 5, 2026

[Bug]: torch.distributed.DistNetworkError: The server socket has failed to listen on any local network address. port: 29500, useIpv6: false, code: -98, name: EADDRINUSE, message: address already in use

bugSomething isn't workingSomething isn't working

Status: Open.

#39015 In vllm-project/vllm;

· qy0720 opened on Apr 5, 2026

[Bug]: Hang During CUDA Graph Capture on ROCM in 0.19

bugSomething isn't workingSomething isn't working

rocmRelated to AMD ROCmRelated to AMD ROCm

Status: Open.

#39010 In vllm-project/vllm;

· depuhitv opened on Apr 5, 2026

[Perf]: ~23% output throughput regression on Qwen3.5-397B NVFP4 decode (8×B200) over the last 10 days

performancePerformance-related issuesPerformance-related issues

Status: Open.

#39004 In vllm-project/vllm;

· vadiklyutiy opened on Apr 4, 2026

[Bug]: Gemma 4 MoE (26B-A4B) — runtime MXFP4 quantization crashes during weight loading in fused MoE layer

bugSomething isn't workingSomething isn't working

Status: Open.

#39000 In vllm-project/vllm;

· leuski opened on Apr 4, 2026

[Bug]: Gemma 4 MoE (26B-A4B) crashes with --data-parallel-size > 1 — AssertionError in cuda_communicator all_gather

bugSomething isn't workingSomething isn't working

Status: Open.

#38999 In vllm-project/vllm;

· leuski opened on Apr 4, 2026

Qwen-3.5 9B often producing repetitive/garbled output with Intel Backend

bugSomething isn't workingSomething isn't working

Status: Open.

#38994 In vllm-project/vllm;

· AlexanderValentini opened on Apr 4, 2026

[Bug]: runai_safetensors_weights_iterator yields tensors in nondeterministic order, breaking FP8 inference on some platforms

Status: Open.

#38991 In vllm-project/vllm;

· janbernloehr opened on Apr 4, 2026

[Performance]: Qwen 3.5 27B Prefix Caching

performancePerformance-related issuesPerformance-related issues

Status: Open.

#38988 In vllm-project/vllm;

· NilsHellwig opened on Apr 4, 2026

[Bug]: Sync EPLB rearrangement hangs indefinitely with DP8 + EP on B200

bugSomething isn't workingSomething isn't working

Status: Open.

#38986 In vllm-project/vllm;

· arpera opened on Apr 4, 2026

[Bug]: Enabling cudagraph_mm_encoder results in ModuleNotFoundError

bugSomething isn't workingSomething isn't working

Status: Open.

#38982 In vllm-project/vllm;

· zzlol63 opened on Apr 4, 2026