shunping opened a new pull request, #38734:
URL: https://github.com/apache/beam/pull/38734

   Ensures 'refreshCond.Broadcast()' is fully synchronized with its mutex lock 
'refreshCond.L' during pipeline termination and processing-time timer 
scheduling ('wakeUpAt').
       
   This avoids race conditions causing lost wake-up signals and indefinite test 
hangs.


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