Issues

• [EP/CXI] Proxy shutdown double-frees tensor-owned RDMA scratch.

  uccl-project/uccl#1122 · Filter by author Anunay-Yadav opened on Nov 4, 2026

• [P2P] Allow independent async vectors to make progress within one proxy

  uccl-project/uccl#1119 · Filter by author ZeXi0308 opened on Nov 3, 2026

• [EP] Low-latency FP8 EP16 intermittently hangs at the first dispatch on AMD gfx942 (MI300X/MI325X)

  uccl-project/uccl#1111 · Filter by author Oseltamivir opened on Oct 30, 2026

• [EP] Internode dispatch deadlocks after a partial RDMA ring release (sender coordinator waits for a full chunk)

  uccl-project/uccl#1110 · Filter by author Oseltamivir opened on Oct 29, 2026
  1

• [collective/rdma][EQDS] One-GPU-per-process mode creates duplicate pacers per physical NIC

  uccl-project/uccl#1095 · Filter by author SallyChangLiu opened on Oct 22, 2026

• [collective/rdma][EQDS] Grant pacing uses OR limits and counts failed sends as consumed credit

  uccl-project/uccl#1094 · Filter by author SallyChangLiu opened on Oct 22, 2026

• [RFC][P2P] Capability-qualified PCIe IPC validation, starting with multi-GPU L20

  uccl-project/uccl#1053 · Filter by author 0z5a opened on Sep 18, 2026
  1

• [p2p] Compression path still requires user buffers to be MR-registered

  uccl-project/uccl#1033 · Filter by author monopodium opened on Jul 28, 2026
  1

  

• Feature request: allow a single ep.Buffer to serve both normal and low_latency modes (dynamic mode switching)

  uccl-project/uccl#1023 · Filter by author whn09 opened on Jul 16, 2026
  1

• Can UCCL speed up internode all2all on AWS p5en?

  uccl-project/uccl#1022 · Filter by author goldhuang opened on Jul 15, 2026
  1

• [EP] LL mode + TBO: illegal memory access in _mask_topk_ids_padded_region during cuda graph capture

  uccl-project/uccl#987 · Filter by author xyxiang7 opened on Jun 3, 2026

• [EP] Normal mode + TBO: prefill deadlocks at notify_dispatch barrier

  uccl-project/uccl#986 · Filter by author xyxiang7 opened on Jun 3, 2026
  1

• [P2P] High jitter

  uccl-project/uccl#978 · Filter by author zhongjiechen opened on May 30, 2026
  

• UCCL-EP v2 based on DeepEP v2.

  uccl-project/uccl#961 · Filter by author MaoZiming opened on May 23, 2026
  

• UCCL vs MORI comparison

  uccl-project/uccl#954 · Filter by author praveingk opened on May 21, 2026
  8

• Open Letter on Acknowledging UCCL to Support Open Source (May 2026)

  uccl-project/uccl#944 · Filter by author YangZhou1997 opened on May 16, 2026

• [Performance Feedback] deepep_ll Dominates for MLA/DSA Models

  uccl-project/uccl#926 · Filter by author pbelevich opened on May 6, 2026

• [Feature Request] Adaptive EP Buffer Sizing

  uccl-project/uccl#925 · Filter by author pbelevich opened on May 6, 2026
  1

• CUDA OOM on Large Models (>50% GPU Memory)

  uccl-project/uccl#924 · Filter by author pbelevich opened on May 6, 2026
  1

  

• UCCL-EP: Silent Deadlock with 256 Experts + FP8 + EP=16 (TP=1/DP=16)

  uccl-project/uccl#923 · Filter by author pbelevich opened on May 6, 2026
  2

  

• [Bug] DataLoader workers SIGSEGV when fork()ed after uccl-ep Buffer init (missing ibv_fork_init, proxy pthreads, HIP IPC, MADV_DONTFORK'd MRs)

  uccl-project/uccl#895 · Filter by author zhenhuang12 opened on Apr 22, 2026
  2

  

• [Bug] Intermittent crash during EP=16 training on EFA (p5en)

  uccl-project/uccl#878 · Filter by author renov opened on Apr 13, 2026
  3

  

• Refactor build pipeline to support baremetal and containerized builds (C++ and Python APIs)

  uccl-project/uccl#851 · Filter by author sa1g opened on Mar 26, 2026
  3

• [bug] Stress test fail

  uccl-project/uccl#684 · Filter by author crazyguitar opened on Jan 26, 2026
  4

• [EP] EP=24 seems to get stuck, not EP=16 or EP=32

  uccl-project/uccl#671 · Filter by author MaoZiming opened on Jan 23, 2026