A kernel panic is a computer error that the operating system cannot easily recover from and your computer restarts unexpectedly.
If you are using OpenAFS for any version of macOS prior to 10.13 High Sierra you MUST uninstall OpenAFS before upgrading your Mac to High Sierra. If you do not, your computer will end up in a kernel panic loop. If your Mac does end up in a kernel panic, here are the steps you can take to recover from it.
- Shut down your computer.
- On startup, enter single-user mode (Command + S).
- From the command line, type
/sbin/mount -uw /
rm -f -R /var/db/openafs
- The macOS High Sierra installation will continue. After the upgrade is complete download and run the Stanford Software Removal Tool for Mac.
- Remove OpenAFS.
- Reboot your computer.