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mlx5: ZTR-RTT CC is not enabled by default when DEVX=try (unlike DEVX=no)

Bug

Status: Open.

#11558 In openucx/ucx;

· kimullaa opened on Jun 16, 2026

cuda_ipc: VMM/mempool memory with POSIX_FD-only handle types silently loses the cuda_ipc lane (PyTorch expandable_segments) — add a pidfd-based POSIX_FD arm

Status: Open.

#11548 In openucx/ucx;

· xyuzh opened on Jun 11, 2026

Question about namespace requirements for UCX posix shm in a host <-> isolated-container deployment

Status: Open.

#11546 In openucx/ucx;

· reverseW opened on Jun 10, 2026

UD: control skb reuse before CQE in uct_ud_ep_purge_outstanding()

Status: Open.

#11544 In openucx/ucx;

· hyeonseong-choi opened on Jun 10, 2026

GPUDirect RDMA is not supported on Fedora CoreOS

Bug

Status: Open.

#11540 In openucx/ucx;

· hahahannes opened on Jun 9, 2026

Infinite loop in ucp_add_tl_resources() when num_tl_resources == 256

Bug

Status: Open.

#11505 In openucx/ucx;

· ivanallen opened on May 29, 2026

TCP chosen over CUDA COPY on the same host.

Status: Open.

#11487 In openucx/ucx;

· DevUt opened on May 26, 2026

ucx_perftest tag_bw -m cuda shows phase-changing bandwidth and stalls for large CUDA messages on single-node GPU pair

Bug

Status: Open.

#11476 In openucx/ucx;

· CyberSecurityErial opened on May 21, 2026

cuda_copy excluded from RMA BW lanes when peer-failure error handling is enabled

Bug

Status: Open.

#11318 In openucx/ucx;

· pentschev opened on Apr 1, 2026

Question about UCX_CONNECT_ALL_TO_ALL

Status: Open.

#11284 In openucx/ucx;

· Morifolium opened on Mar 23, 2026

Inconsistent pair-wise osu alltoallv latency between H200s due to intra-node mlx5 transport

Bug

Status: Open.

#11282 In openucx/ucx;

· vitduck opened on Mar 22, 2026

Supporting Linux kernel TCP zero-copy functionality

Status: Open.

#11260 In openucx/ucx;

· tohojo opened on Mar 13, 2026