Docker container processes frequently being zombied

[makeusabrew]

This is wholeheartedly related to #2 but worth splitting out into its own issue - we must get to the bottom of why the combination of child processes aren't naturally exiting. Forcefully calling various .exit() methods (on children and parents) is leaving some docker containers running, and/or (not sure if it's a 1:1 mapping) several zombie node processes which seem to just chew up load.

See moby/moby#1320 for something which sounds vaguely similar.

Just need to step through layer step by step and hunt this down once and for all.

[anandkumarpatel]

script that will help you repro the issue:

#!/bin/bash
CNT=0
while true
do 
  echo $CNT
  DOCK=$(sudo docker run -d -t anandkumarpatel/zombie_bug ./node index.js)
  sleep 60 && sudo docker stop $DOCK > out.log &
  sleep 1
  CNT=$(($CNT+1))
  if [[ "$CNT" == "50" ]]; then
    exit
  fi
done

[anandkumarpatel]

I think this can be closed based on issue #1340