Hi,
Sunday morning, I discovered that my n900 was shut down because of battery shortage. Looking at the battery history, the battery began to discharge at midnight very quickly.
Monday morning, arriving at my office, all my Unix servers using Java or MySQL were in trouble (100% of CPU usage).
Hopefully, we received a mail from VMware with the explanation : at midnight between June 30th et July 1st, 1 second has been added to the NTP server, and every Linux server using NTP time synchronization and running Java applications or databases faced a bug in the Linux kernel that provides wrong informations and cause the CPU usage to rise to 100%.

What a nice DOS attack it could be ...