Zabbix server crashes a short time after starting.
This server has been in prod for a while. This is a new issue.
When the issue began, I was experimenting with the API, trying to pull recent history items. The MySQL server began consuming a ton of CPU, which didn't cease after I terminated my API calls or restarted the zabbix server, so I restarted the MySQL server.
I also had run a yum update earlier, which appears to have resulted in an update to mysql-connector-odbc. (Which may be of particular interest, as a mysql odbc poller thread appears to be in the backtrace, if I read the output correctly.)
When the zabbix server crashes, systemd restarts it. It then crashes again after a little while.