Deadlock with KDE in Ubuntu Natty

I don't have too much problems with my Ubuntu, but sometimes a zomby process appeared in the process list:

...
24456 ? 00:00:00 setxkbmap <defunct>
...

It was impossible to kill this process with kill -9 and the whole plasma desktop etc became unresponsive, I had to reboot my laptop...not too nice. I found the solution in a blog post.

Enhanced listing of the dead process (checking the parent process):

ps -ef | grep defunct | more

24456 1835 0 14:53 ? 00:00:00 [setxkbmap] <defunct>

And ps -e | grep 1835, voilá:

1835 ? 00:04:53 kded4

My good old friend, the KDE daemon. It made infinite loops in Lucid time to time, so it is again time to kill:

killall -9 kded4

...and my KDE desktop recovers again.