Problem: Right now a socket error in EthernetInterface::socket_egress results in both socket_egress and poll returning early, which prevents socket_egress from processing other sockets and poll from processing ingress packets. For example, if a socket tries to send a packet to an unresolved host, inner.dispatch returns Error::Unaddressable, which shortcuts socket_egress and poll, which prevents ingress sockets from being processed, and host's MAC from being resolved, while the socket exists.

Solution: Make socket errors non-critical, a socket error shouldn't affect other sockets or ingress packet processing.

Other: I'm not sure if this is the best solution, but the problem is real, specifically the situation described above.