Bug#1135798: openssh-client: OpenSSH in trixie-p-u breaks ControlPersist

On Wed, May 06, 2026 at 12:06:03PM +0100, Colin Watson wrote:
>On Tue, May 05, 2026 at 09:42:31PM -0400, Jon wrote:
>>I'm not sure if this is the right way to file a bug against something
>>sitting in stable-proposed-updates. I'm flagging it as important only
>>because it would be a notable regression if it reached stable.
>
>Oops - thanks for the heads-up!  CCing #1135624 so that the release 
>team is aware of the regression.
>
>>The recent upload of OpenSSH to trixie-p-u backported the IPQoS changes
>>from 10.1p1 without including the fix for bz#3872
>>
>>https://bugzilla.mindrot.org/show_bug.cgi?id=3872
>>
>>https://anongit.mindrot.org/openssh.git/commit/?h=V_10_1&id=979cbc2c1e0c9cd2f60d45d8d1da69519ec425cf
>>
>>I've confirmed that the bug appears in the package sitting in trixie-p-u
>
>I'm test-building the attached patch, and will upload to trixie-p-u if 
>it checks out.

This works.  Manual test plan: in a fresh container with openssh-client 
installed, use `ssh -S"$(pwd)/sock" -o ControlMaster=auto -o 
ControlPersist=5s` to a target host.  The version currently in 
trixie-p-u has horrible delays as described in the upstream bug, which 
go away with that patch.