# macOS 27 libthunderboltrdma rework > The #4192 thread states that libthunderboltrdma.dylib was reworked in macOS 27 builds, per public dyld-cache diffs: assertions added to tbt_post_recv, tbt_post_send and tbt_reg_mr, then tbt_post_recv rewritten and tbt_poll_qp_recv extended Parent: [Mac local LLMs: Clusters, RDMA, exo and ds4](https://llms-explorer.com/tree/mac-local-llms-clusters-rdma-exo-ds4/) · 1 facets · 4 facts · page: https://llms-explorer.com/tree/macos-27-libthunderboltrdma-rework/ ## Facts - The #4192 thread states that libthunderboltrdma.dylib was reworked in macOS 27 builds, per public dyld-cache diffs: assertions added to tbt_post_recv, tbt_post_send and tbt_reg_mr, then tbt_post_recv rewritten and tbt_poll_qp_recv extended — [source](https://github.com/ml-explore/mlx/issues/4192) - The same comment asks whether anyone has re-run the unplug repro on macOS 27 and says the author's five production nodes stay on 26.6.1 to avoid upgrading blind — [source](https://github.com/ml-explore/mlx/issues/4192) - No fetched source (mlx issues 3910, 4192, 4278, 4319, PR 4530, exo issue 1847, TN3205, WWDC26 232 and 233) reports any test of JACCL peer loss or tbt_post_recv on macOS 27 — source: `asserted` - TN3205 documents the RDMA Verbs surface (UC queue pairs only, 10 per device, send/receive only) without any macOS 27-specific error-reporting change — [source](https://developer.apple.com/documentation/technotes/tn3205-low-latency-communication-with-rdma-over-thunderbolt)