LArSoft

A failure was privately reported by David Caratelli, with FindManyInChainP::find() call failing with an error like:

%MSG-s ArtException:  PostEndJob 12-Feb-2018 19:41:06 CST ModuleEndJob
cet::exception caught in art
---- OtherArt BEGIN
  ---- EventProcessorFailure BEGIN
    EventProcessor: an exception occurred during current event processing
    ---- EventProcessorFailure BEGIN
      EndPathExecutor: an exception occurred during current event processing
      ---- ScheduleExecutionFailure BEGIN
        Path: ProcessingStopped.
        ---- ProductNotFound BEGIN
          Couldn't find data product with product ID 3022751813
          cet::exception going through module DavidTest/davidtest run: 5412 subRun: 36 event: 1806
        ---- ProductNotFound END
        Exception going through path end_path
      ---- ScheduleExecutionFailure END
    ---- EventProcessorFailure END
  ---- EventProcessorFailure END
---- OtherArt END

I believe it's a problem originating from art, and issue #18979 has been opened.
In the meanwhile, a workaround is being sneaked in FindManyInChainP code to trigger the reading of the intermediate data products.
When the blocking issue is fixed, the workaround code should be removed from lar::details::AssociationFinder::findWithRange(PtrCollBegin sbegin, PtrCollEnd send, Event const& event).