In G1CollectorPolicy::record_collection_pause_end() the call to record_concurrent_mark_init_end(0.0) will always set the flag _during_initial_mark_pause to false. A few lines further down in G1CollectorPolicy::record_collection_pause_end() there is an if statement: if (during_initial_mark_pause()) The 'then' branch of this if statement will never be taken if we called record_concurrent_mark_init_end.
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