All issues

Search results

VFIO P2P on GeForce maps to a private mirror; NCCL hangs or corrupts

Status: Open.

#2335 In NVIDIA/nccl;

· noonghunna opened on Aug 10, 2026

RoCEv2 receiver deadlocks after successful RDMA_WRITE completions land on 'unused' request slots (net_ib/p2p.cc resiliency path)

Status: Open.

#2334 In NVIDIA/nccl;

· joesinvestments opened on Aug 9, 2026

[Issue]: ncclCommRegister fails with CUDA_ERROR_NOT_FOUND (500) on memory allocated with CUDA VMM.

Status: Open.

#2332 In NVIDIA/nccl;

· thearusable opened on Aug 7, 2026

[Issue]: Symmetric VA exhaustion in symMemoryObtain when registering multiple windows on the same memory allocation.

Status: Open.

#2331 In NVIDIA/nccl;

· thearusable opened on Aug 7, 2026

[Question]: Why NCCL_ALGO_NVLS only support NCCL_PROTO_SIMPLE, no NCCL_PROTO_LL/NCCL_PROTO_LL128?

question

Status: Open.

#2327 In NVIDIA/nccl;

· carpediem0309 opened on Aug 7, 2026

[Issue]: After the rollback of PciInfo the nvmlDeviceGetPciInfo_v3 is used with v2 struct causing stack buffer overflow.

Status: Open.

#2325 In NVIDIA/nccl;

· thearusable opened on Aug 6, 2026

[Issue]: Memory leak risk of function allocateSpilled

Status: Open.

#2324 In NVIDIA/nccl;

· lennyJL opened on Aug 6, 2026

[RFE]: Add persistent backoff recovery mechanism for IB resiliency port recovery

enhancement

Status: Open.

#2323 In NVIDIA/nccl;

· 525309178 opened on Aug 6, 2026

[Question]: why use __threadfence() in LL128 when __CUDA_ARCH__ < 900, but __threadfence_system() when __CUDA_ARCH__ >= 900

question

Status: Open.

#2322 In NVIDIA/nccl;

· MonroeD opened on Aug 5, 2026

[RFE]: Add active-standby paths for fused IB NICs

Status: Open.

#2310 In NVIDIA/nccl;

· tingmingzhong opened on Jul 27, 2026

[Announcement] NCCL EP and NCCL M2N are moving to NVIDIA/nccl-extensions

Community DiscussionCandidate for live discussion with communityCandidate for live discussion with community

Status: Open.

#2308 In NVIDIA/nccl;

· kwen2501 opened on Jul 27, 2026

[Issue]: Blackwell symmetric ReduceScatter selects a slower launch

Status: Open.

#2305 In NVIDIA/nccl;

· samnordmann opened on Jul 23, 2026