It turns out the Ubuntu computer was freezing due to an unstable overclock of the RAM. Perhaps the thread crashed because my code or a library I'm using is not thread safe. Durrell (Durrell Chamorro)
When I run my rails test suite with the parallel_test gem a thread crashes. The test suite completely passes when I don't run the tests in parallel and it also works fine when I run unit tests in parallel, but if I run enough system test...Durrell (Durrell Chamorro)
Durrell (Durrell Chamorro)08:30 PM Ruby Bug #15152: Thread Crashes