chrome crashes upon exit on ubuntu 64-bit if JPI_PLUGIN2_DEBUG is enabled

Chrome crashes upon exit if JPI_PLUGIN2_DEBUG is enabled on ubuntu 12.04 64-bit.

Reproduce steps:
1) set the following debug env variable
   export JPI_PLUGIN2_DEBUG=1
   export JPI_PLUGIN2_VERBOSE=1

2) setup soft link to libnpjp2.so under the chrome's plugins directory which
   is normally at /opt/google/chrome/plugins

3) in the same terminal session, start chrome

4) run an applet

5) open a new tab, run the same applet

6) exit the chrome browser by clicking on the 'x' at the upper left corner of the browser window

The browser crashes at the end with a hs err log.