[Bug 1986521] Re: ssh client spins if output fd closed

[Bryce Harrington]

I've posted a PPA with the patch to fix this issue here:

    https://launchpad.net/~bryce/+archive/ubuntu/openssh-sru-lp1986521

This can be installed via:

  $ sudo add-apt-repository -yus ppa:bryce/openssh-sru-lp1986521
  $ sudo apt-get install openssh

Can you please upgrade to this and verify it fixes the reported issue?

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https://bugs.launchpad.net/bugs/1986521

Title:
  ssh client spins if output fd closed

Status in portable OpenSSH:
  Unknown
Status in openssh package in Ubuntu:
  Fix Released
Status in openssh source package in Jammy:
  Triaged

Bug description:
  The OpenSSH package 8.9p1 as shipped with U22.04 (8.9p1-3) suffers from the bug described at
  https://bugzilla.mindrot.org/show_bug.cgi?id=3411 and https://bugzilla.mindrot.org/show_bug.cgi?id=3405

  A command such as "xterm -e 'ssh -f remote.host sleep 60'" will pop up
  an xterm, ask for whatever authentication is needed, close the xterm,
  and leave the ssh client spinning consuming CPU time for 60 seconds
  before it exits. It should leave the ssh client idle for 60 seconds.
  Many uses of ssh to launch graphical applications will be caught by
  this bug.

  This is fixed in OpenSSH 9.0p1 as the first bugfix listed in its
  release notes at https://www.openssh.com/txt/release-9.0

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