How do I start taskgated again?
You can either reboot, or run
sudo launchctl load /System/Library/LaunchDaemons/com.apple.taskgated.plist
When I ran launchctl load I got this error:
/System/Library/LaunchDaemons/com.apple.taskgated.plist: Operation already in progress
So I had to run:
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.taskgated.plist
Followed by:
sudo launchctl load /System/Library/LaunchDaemons/com.apple.taskgated.plist
And even then it took about a half minute for it to show up in ps.