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slices.Insert(cmd, 1, "-O", "check") writes into cmd's backing array when there is spare capacity (cap(cmd) >= len(cmd)+2). check_cmd points at the shifted array, but cmd's slice header is unchanged: reading cmd[:insertion_point] later returns "-O", "check", ... where the original prefix used to be. run_control_master, forward_remote_control, and the final ssh exec all build their argvs from this corrupted prefix. Repro: share_connections=yes, forward_remote_control=yes, and enough ssh_args to push cmd past Go's slice-growth threshold (kitten ssh -v host does it). With the ControlMaster already up you'll see "Multiplexing command already specified"; otherwise it fails with "Failed to start SSH ControlMaster" and a stray -O check left in the cmdline.
= kitty - the fast, feature-rich, cross-platform, GPU based terminal If you live in the terminal, *kitty* is made for **you**! See https://sw.kovidgoyal.net/kitty/[the kitty website]. image:https://github.com/kovidgoyal/kitty/workflows/CI/badge.svg["Build status", link="https://github.com/kovidgoyal/kitty/actions?query=workflow%3ACI"] https://sw.kovidgoyal.net/kitty/faq/[Frequently Asked Questions] To ask other questions about kitty usage, use either the https://github.com/kovidgoyal/kitty/discussions/[discussions on GitHub] or the https://www.reddit.com/r/KittyTerminal[Reddit community] Packaging status in various repositories: image:https://repology.org/badge/vertical-allrepos/kitty-terminal.svg?columns=3&header=kitty["Packaging status", link="https://repology.org/project/kitty-terminal/versions"]