Bug#1007822: "ssh -XAf localhost xeyes" uses 100% CPU after losing tty

Hi all,

I am also seeing 100% CPU load from SSH when using it with autossh to set up 
port forwarding in the background (no X11 forwarding involved):

/usr/bin/autossh -M 0 -N -o "ServerAliveInterval 30" -R $IP:$PORT1:localhost:443 
-R $IP:$PORT2:localhost:80 $USER@$HOST -i $KEY

This only recently started with the latest 'apt upgrade'.

; Ralf

On Thu, 17 Mar 2022 13:26:09 +0100 Harald Dunkel <[email protected]> wrote:
> Package: openssh-client
> Version: 1:8.9p1-3
> 
> If I use
> 
> 	ssh -XAf localhost xterm
> 
> to run a second xterm, then ssh eats up 100% CPU after closing the
> first xterm.
> 
> Same happens for xeyes or other XWindow apps. It doesn't have to be
> localhost, either.
> 
> "nohup ssh -XAf ..." seems to work, but for Bullseye it works very well
> without nohup.
> 
> SHELL is bash 5.1-6
> 
> 
> Regards
> Harri
> 
>