fil_flush_file_spaces(): Copy the system->unflushed_spaces list to an array while holding the mutex.  This removes the crash-triggering race condition that was introduced when fixing Bug #15653.  (Bug #24089)
fil_flush_file_spaces(): Copy the system->unflushed_spaces list to an
array while holding the mutex.  This removes the crash-triggering
race condition that was introduced when fixing Bug #15653.  (Bug #24089)


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