nacl_helper using 88GB virtual memory??

[Neal Becker]

ps aux | grep nacl
nbecker   1647  0.0  0.0 140384  1176 ?        S    07:26   0:00 
/opt/google/chrome/nacl_helper
nbecker  10369  0.0  0.3 88232452 13408 ?      Sl   13:13   0:00 
/opt/google/chrome/nacl_helper

what does this mean?  Clearly it's not really using that - the machine doesn't
have that much.