So sometimes my N9 becomes unresponsive.

The last time it did this I managed to get an xterm to ssh to it (took a while to log in - because it was unresponsive) to see what is causing the issue.

And I discover (no surprise here) that I have 0% idle, and the main CPU culprit is kswapd0 which is using a constant 70% CPU, more or less.

This has been going on for a full 20 minutes or so and then I decide to kill the Fennec process. kswapd0 drops away and suddenly I have 95% idle.

So I am guessing that Fennec has some issues with memory management. If any of you have trouble with your N9 becoming unresponsive, and you have Fennec/Firefox installed, that could be the problem.

Incidentally, for those of you who want more than the built-in 'top' command gives you, try the following as root:

apt-get install htop

Very possible, the problem is to identify what exactly in Firefox causes this. Heavy swapping can simply mean that Firefox ate up all the RAM.