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[Issue]: Silent hang: recv proxy erases the netReg rendezvous flag written by the kernel

Status: Open.

#2389 In NVIDIA/nccl;

· enpimashin opened on Sep 5, 2026

[Bug]: Deadlock in bootstrap when ranks are unevenly distributed across nodes (7+8), contiguousRanksPerHost falls back to INT_MAX

Status: Open.

#2385 In NVIDIA/nccl;

· bhaveshdavda opened on Sep 3, 2026

[GIN/GDAKI] A TRANSPORT_RETRY_EXC_ERR completion on a GDAKI QP hangs the device forever: the device-side wait loops treat an error CQE as "not yet"

Status: Open.

#2383 In NVIDIA/nccl;

· kiwi3shark opened on Sep 2, 2026

[Issue]: segment fault at ncclTuningCostModelInit tracing

Status: Open.

#2380 In NVIDIA/nccl;

· fishautumn opened on Aug 31, 2026

Probabilistic multi-communicator init hang in the cuMem UDS fd exchange on single-node PCIe (no NVLink); NCCL_CUMEM_ENABLE=0 isolates it, 20/20 vs 5/9 A/B

Status: Open.

#2379 In NVIDIA/nccl;

· tomylin890 opened on Aug 29, 2026

[Question]: potential memory consistency issue with rmda ce

question

Status: Open.

#2375 In NVIDIA/nccl;

· jianjunbd opened on Aug 26, 2026