I think I'm seeing related behaviour in
https://github.com/jupyterhub/configurable-http-proxy whenever it tries to use ssl:
kernel: traps: node[12194] general protection ip:7ff4c82e6ce0 sp:7fffb7d4d2a0 error:0 in
libcrypto.so.1.0.1e[7ff4c81de000+1be000]