Comment 3 for bug 863629

I now know how I I was hitting this.
On my local system, I would log, open a terminal and and then run a bip proxy with:
 ssh -o ControlPath=none -C -L 7778:localhost:7778 -f -N ${HOST}

I can replicate that same behavior by ssh'ing to a system, then doing:
  sleep 30m & disown; exit
After that, 'sleep 30m' will be alive and holding the /dev/pts/0 so nothing will get that any more, but the entry is deleted.

I couldn't seem to get that to work through ssh running the command ie, the following kills the sleep and frees the /dev/pts/0:
  ssh $HOST -t 'sleep 30m & disown; exit 0;'