I'm using Jenkins for continuous testing. A build is a test. I'm running build 100 (test 100) on node A, and it runs for 3 hours (or 2 days). In parallel, I'll run tests build 101 (test 100) on node B - and when it fails, it's 'stuck' with:
Take node offline on failure is waiting for a checkpoint on test #100

I'm not sure what checkpoint it's waiting for, but it does not end a failed job.
There are no dependencies I'm aware of between them.