 <p>I believe this works and is the canonical repository of this kind of info. (If it doesn't, the page should be fixed!)</p> <p><a href="http://www.chromium.org/nativeclient/how-tos/debugging-documentation/debugging-with-debug-stub-recommended/debugging-nacl-apps-in-chrome-os" rel="nofollow">http://www.chromium.org/nativeclient/how-tos/debugging-documentation/debugging-with-debug-stub-recommended/debugging-nacl-apps-in-chrome-os</a></p> <p>Yes, you can use gdb remotely.</p> <p>To see printf output, try chrome:://system and expanding the ui_log.</p>