Sometimes an assertion in libevent fails when shutting down mysql-lb. The assertion failure occurs after all client and server connections have been closed already, thus is does not affect the normal operation of the program.

When using UNIX domain sockets to specify backends, it logs errors like: network-mysqld.c.1648: can't convert addr-type 1 into a string This is recorded as a Bug#35216 and will be fixed in the next release. The implication is that the backend address is not available in the Lua scripts, it does not impair normal operations of the program.