Hello Keith, Thanks for your reply. Sorry if I wasn't clear but: 1. Everything works fine in a single threaded environment. We start seeing the issues only when we introduce additional readers in separate threads. CREATE TEMP TRIGGER seems to be the culprit, though I can't be sure. 2. the function only does logging (ie printf) We are continuing the investigations at our end, I will post an update if we come up with something. Best regards, Burak