Bug#1117594: openssh-client: interactive session traffic slow and erratic

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On Wed, 08 Oct 2025 11:45:02 +0200 Francesc Zacarias <[email protected]>
wrote:
> Package: openssh-client
> Version: 1:10.1p1-1
> Severity: grave
> Justification: renders package unusable
> X-Debbugs-Cc: [email protected]
> 
> Dear Maintainer,
> 
>    * What led up to the situation?
>      Installing the latest openssh-client package in unstable
>      (1:10.1p1-1). all
>    * What exactly did you do (or not do) that was effective (or
>      ineffective)?
>      My interactive connections to SSH servers are not working well. All
>      keys and commands are being displayed with a very long delay.
>      The connection seems to freeze, but if I type a lot of keys, my
>      previous commands are eventually displayed.
>      I suspect this is related to the IP QoS changes introduced in openssh
10.1.
>      Sending many keys/commands causes a local buffer to fill and the
>      packet eventually gets sent. But this is not a sustainable way to
>      use SSH interactively.
> 
>      Tried different settings for the IPQoS option, but it did not make a
>      difference.
> 
>      Reverting to a previous version of the package
>      (openssh-client 1:10.0p1-8 from testing/forky) fixed the issue.
> 

I seem to experience the same (kind of) issue here. I don't have a bugzilla
account so I can't check the linked bug but I noticed that disabling
ControlMaster (which I have set to auto) seems to workaround the issue for me.

Regards,
- -- 
Yves-Alexis
-----BEGIN PGP SIGNATURE-----

iQEzBAEBCAAdFiEE8vi34Qgfo83x35gF3rYcyPpXRFsFAmjmOVIACgkQ3rYcyPpX
RFvWYwgAq6nvdSpNiwl2SJYKMV5dBK4FNN43Q4p34gWe46ENG3vpUV4KC7ZymlvS
cPbUn+S2HGiMSejkxVy15Cs913DvEPwBKEntI7OGDBT2hjrRt2wqHMqblyW0ZHC4
/HTmlIsqobZFHGFP8Ljy1UAVw/mZx/5tS+p5x1o/rQALZOTbgZ23OpSH1H8AYOQr
XKWehsixUyX888BT6f9sxRC5EZi2S9Ffs6RSSMRbFSV9j+FyqX2XVzw0nhU3wpgk
MAH5SKv4LlhM3WgyqLaliCfhEMUlgStqfXgPrsq0XGM5Sy68mCWl8AQSLdDhGMPI
qkkhYsc2sh8n7Cdm8lNxzf/P9YD3rA==
=fiqX
-----END PGP SIGNATURE-----