Ubuntu
openssh package

  1. Bug #1986521
  2. Comment #2

Comment 2 for bug 1986521

Revision history for this message
Sergio Durigan Junior (sergiodj) wrote :

Thanks for taking the time to report the bug and make Ubuntu better.

I can reproduce the bug using your testcase, but that requires a VM with a graphical environment installed. Another way to reproduce the bug is (from the upstream bug report):

$ lxc launch ubuntu-daily:jammy ssh-cpu
$ lxc shell ssh-cpu
# ssh HOST 2> >({exec 1>&2})

You can shell into the container from another terminal and use "htop" to verify that ssh is using 100% of one of the CPU cores.

This seems to have been fixed upstream by the following commit:

https://github.com/openssh/openssh-portable/commit/d6556de1db0822c76ba2745cf5c097d9472adf7c

I confirmed that this only happens on Jammy. Focal and Kinetic are not affected.