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[BUG] NCCL 2.30.4 NVLS code path hangs MoE expert weight loading on 8× DGX Spark (sm_121, no NVLink); 2.30.3 works

Status: Open.

#2167 In NVIDIA/nccl;

· idonati opened on May 10, 2026

[Issue]: GIN may choose wrong NIC when net plugin is used

Status: Open.

#2165 In NVIDIA/nccl;

· fishautumn opened on May 8, 2026

[RFE]: Replace assert() with proper error handling

enhancement

Status: Open.

#2163 In NVIDIA/nccl;

· LeviMee opened on May 8, 2026

[Question]: Do we have any plan to integrate the nccl ep to megatron?

question

Status: Open.

#2162 In NVIDIA/nccl;

· gangxie112 opened on May 8, 2026

NCCL_TOPO_XML_MAX_NODES=256 limit hit during intra-node XML fusion on 32-NIC hosts (AWS p5.48xlarge)

Status: Open.

#2160 In NVIDIA/nccl;

· dmvevents opened on May 7, 2026

[Question]: NCCL 2.28.9 compatibility with V100 (sm_70) — segfault in ncclCommInitRank

question

Status: Open.

#2159 In NVIDIA/nccl;

· Tchoupi2001 opened on May 6, 2026

[Issue]: NIC recovery failure

Status: Open.

#2157 In NVIDIA/nccl;

· Mitchelljdaw opened on May 4, 2026

[Issue]: External GIN plugin RMA state never transitions to InitReady, breaking hostRmaSupport

Status: Open.

#2156 In NVIDIA/nccl;

· ezhulenev opened on May 3, 2026

[Question]: What is the purpose of the NOP WQE in nccl gin

question

Status: Open.

#2152 In NVIDIA/nccl;

· shenhongqian opened on Apr 30, 2026

[Question]: NVLS: Bandwidth utilization appears to drop vs theoretical NVLink bandwidth.

Status: Open.

#2140 In NVIDIA/nccl;

· shenyt-sanshui opened on Apr 28, 2026

[Question]:Regarding the issue of measurement results provided by the Inspector plugin

question

Status: Open.

#2139 In NVIDIA/nccl;

· zhangjunjie64 opened on Apr 28, 2026

[Issue]: ginTrafficClass in ncclDevCommCreate requirements not taking effect

Status: Open.

#2138 In NVIDIA/nccl;

· huakainomore opened on Apr 28, 2026