Tagged brittle spec.

Author: jdantonio

spec/concurrent/executor/fixed_thread_pool_shared.rb

@@ -227,7 +227,7 @@
     # To check for caller_runs, we'll check how many unique threads
     # actually ran the block
 
-    it 'uses the calling thread for overflow under caller_runs' do
+    it 'uses the calling thread for overflow under caller_runs', :brittle do
       latch = Concurrent::CountDownLatch.new(5)
       mutex = Mutex.new