when error:loop , the cpu and mem are go out

[badnotes]

when I set the rebar.config the follows (this is error syntax) in rebar app:

{sub_dirs, ["rel","."]}.

In that time,my computer will break down, the cpu and mem are go out.

➜ ~ ps -ef |grep beam
wanjun 3909 3906 8 18:50 ? 00:00:29 /usr/lib/erlang/erts-5.9.1/bin/beam.smp -B -- -root /usr/lib/erlang -progname erl -- -home /home/wanjun -- -boot start_clean -noshell -pa rebar/rebar/ebin -run escript start -extra /usr/local/bin/rebar compile skip_deps=true
wanjun 4326 4219 0 18:56 pts/5 00:00:00 grep beam
➜ ~ kill -9 3909

when I kill the process, I can see so many error in the sublime text console,
16723 lines data, it is repeat this:

ERROR: infinite loop detected:
sub_dirs entry "." in /home/wanjun/pro/erlang/rebarapp/rebar.config

➜ ~ rebar -V
rebar 2.1.0-pre R15B01 20130710_094740 git 2.1.0-pre-140-g620c4b0
➜ ~