Bug: Segmentation fault at stop attempt of receiver

[kferjaoui]

I consistently have a 'Segmentation fault (core dumped)' error every time I run the r.stop() command... It seems the SummingReceiver::stop() defined in SummingReceiver.cpp fails to clean up correctly in particular when trying to stop the CollectingStreamer somewhere around here i expect

streamer_->stop();
    for (auto &&t : processing_threads_)
        t.join();