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yuchou87
cfc29a1383
A race could occur when Close() called conn.Session.Close() concurrently with an in-flight conn.Session.CallTool(), leading to undefined behavior. Fix by adding a sync.WaitGroup to Manager: - CallTool increments the WaitGroup while holding the read lock (after checking m.closed), ensuring no new calls are counted after Close sets the flag - Close sets m.closed=true, releases the write lock, then waits for all in-flight calls to finish via wg.Wait() before closing sessions