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ZeroMQ is a C++ library written by a guy who hates C++:

He later rewrote the whole thing in C:

We've also had memory leaks - not sure of the exact issue, but it's related to large scale reconnects. https://github.com/zeromq/libzmq/issues/1256

Yep. Every few days the process was oom killed because of that. When we moved away from it and used OS sockets directly, everything worked fine.

Not necessarily. It's not a good idea to assume that the library you are using is perfect and free of bugs.

OSes and popular OSS libraries have ridiculous bugs sometimes.