Django server gets killed

When I want to start a server with Django, after let's say 10 seconds it gets killed:

root@Arduino:/mnt/sda1/arduino/tmp/djangotest/sample# ./manage.py runserver 0.0.0.0:9876
Killed

Who or what is killing it? And how can I avoid this from happening. Can it be that the Yun runs out of memory? When I do top the amount of 'free' decreases significnatly when starting this command.

edit: probably same problem as in topic http://forum.arduino.cc/index.php?topic=288738.0

Did seem to be a memory issue. I killed some of my other processes and then the server started, but with just 1000K free according to top :-(