ControlMaster triggers BUG: (protocol error){channel.c:57} about tinyssh HOT 5 CLOSED

Sorry for the delayed response.
I confirm your fix 70bded3 works for me.
When re-running the test SSH commands, the first client remains open, and the second one now does this, indicating correct automatic fallback to non-muxed mode:

mux_client_request_session: session request failed: Session open refused by peer
Warning: Permanently added '[localhost]:2022' (ED25519) to the list of known hosts.
ControlSocket /home/twb/.ssh/master-1cba28b29465b90338a34530bde6867ca490e3de already exists, disabling multiplexing
root@main:~# 

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PS: if making ControlMaster work is nontrivial, I think it's sufficient to just give a clear error and what the user should do about it (e.g. tell openssh/ansible/tramp.el/... not to use ControlMaster).

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Hello,
thanks for bugreport.
Here: 70bded3
is the fix. New channel is correctly rejected instead of closing the connection.

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Can You please independently confirm if the fix works for You?

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Fixed in version 20220101.

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