Hey, > The bug here is likely due to 32-bit signed integer wrapping. That can > only happen in C code, so to me possible culprits would be > guile-simple-zmq or the layer above it (if there’s a binary protocol > involved) or the postgresql interface. Only a vague intuition, though. Hmm, looks like you're right! There's a memory corruption in the remote-server process that's really hard to reproduce. I suspect the ZMQ library or its Guile bindings. I'm trying to valgrind the process to identify the issue, without much success for now. Thanks, Mathieu