An anonymous reader writes, "At 2:46 CST today, the game Second Life was hit by a massive attack by a rogue programmer. Spinning gold rings began to appear in the air and on the ground, and as users interacted with them they began to chase and replicate. Apparently, most people are willing to touch an object they've never seen before and this invoked a worm script that was designed to multiply and spread across the 2,700+ servers run by Linden Labs in California, the game's owner. Many of the six hundred thousand active users experienced serious lag and lost connectivity to the servers, making it one of the largest known denial-of-service attacks in an online game. Linden Labs had to invoke martial law and lock out all logins by users except their staff as they began the task of cleaning the servers of what they began to term 'the grey goo.'"
Comments in the SL blog entry indicate that Linden Labs had already deployed a "grey goo fence" before this worm struck, but someone found a hole in it.