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UCT/IB/MLX5: Should rc_mlx5 support bounded batch CQ draining?

Status: Open.

#11729 In openucx/ucx;

· Zacky-ran opened on Aug 5, 2026

UCT/IB/MLX5: Non-DevX rc_mlx5 CQ notification misses after Direct Verbs polling

Bug

Status: Open.

#11728 In openucx/ucx;

· Zacky-ran opened on Aug 5, 2026

UCT/CUDA_IPC: cuIpcGetMemHandle pass confused addr in cuda_ipc_md.c

Bug

Status: Open.

#11724 In openucx/ucx;

· ACEMaravilla opened on Aug 4, 2026

UMR QP INIT2RTR fails on LAG-bonded devices, causing segfault on memory registration

Bug

Status: Open.

#11709 In openucx/ucx;

· Bowser1704 opened on Jul 31, 2026

#11547 concentrates multi-rank GPU RMA traffic onto a subset of NICs (4 of 8), causing severe oversubscription and multi-× bandwidth loss

Bug

Status: Open.

#11680 In openucx/ucx;

· bosilca opened on Jul 20, 2026

cuda_copy transport in UCX_TLS degrades LLM inference throughput

Status: Open.

#11652 In openucx/ucx;

· UnpureRationalist opened on Jul 14, 2026

Version 1.21.0 does not build without gpunetio

Bug

Status: Open.

#11591 In openucx/ucx;

· lahwaacz opened on Jun 25, 2026

Feature request: allow UCP AMO offload for partially capable UCT atomic masks

Status: Open.

#11572 In openucx/ucx;

· sgomw opened on Jun 23, 2026

UCS/VFS: stale/freed node access when refresh_cb removes the current node or parent

Bug

Status: Open.

#11568 In openucx/ucx;

· Zacky-ran opened on Jun 22, 2026

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