X11 forwarding slows down Ubuntu 15.10 with Unity desktop whose whole graphic interface repeatedly becomes unresponsive for seconds if `ssh -X` or `ssh -X -C` is used. This wasn't the case in previous unknown versions. experienced with V_7_1_P1-171-g4c6cb83
(In reply to krichter from comment #0) [...] > experienced with V_7_1_P1-171-g4c6cb83 that is a version of OpenSSH modified by a third party. Can you reproduce the problem with a binary compiled from stock sources from openssh.com?
>> experienced with V_7_1_P1-171-g4c6cb83 >that is a version of OpenSSH modified by a third party. Can you >reproduce the problem with a binary compiled from stock sources from >openssh.com? Following http://www.openssh.com/portable.html I cloned git://anongit.mindrot.org/openssh.git and I run `git fetch --all && git checkout V_7_1_P1-171-g4c6cb83 and git describe` I get this version identifier. I now have _also_ have this issue with (the possibly third party modified) version 1:7.2p2-1 on Ubuntu 16.04.
Assuming that portable versions ought to be reported outside this tracker (instructions at http://www.openssh.com/portable.html and feedback from @DarrenTucker might or might not mean that) I reported this at https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1572939 as well (launchpad.net claims to be the official bug tracker for OpenSSH on Ubuntu).
Close all resolved bugs after 7.3p1 release