Race condition when using ControlMaster=auto with simultaneous connections (added Bug 3971 and a patch; requesting review)

Jens Rosenboom via openssh-unix-dev <[email protected]> Sun, 21 Jun 2026 22:17:22 +0200
Newsgroups gmane.network.openssh.devel
Message-ID <[email protected]>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