Symptom
A kernel panic message appears during startup after updating to Mac OS X 10.2.1, or optimizing a Mac OS Standard volume. The most recent panic in the "panic.log" file contains the text:
"kernel loadable modules in backtrace com.apple.BootCache (with dependencies)"
Solution
Use the following workaround:
1. Press and hold the Shift key during startup.
Note: If you cannot start up the computer this way, see technical document 106464, "Mac OS X: Troubleshooting a Startup Issue".
2. Click the Finder icon in the Dock.
3. Choose Go To Folder from the Go menu.
4. Type: /var/db
5. Click Go.
6. Locate this file: BootCache.playlist
7. Drag this file to the Trash.
8. Restart