The zabbix_server process crashed with the following stack. I will attach the full output as it is pretty long. Since it looks memory-related I should note that I have about 75% of the machine's RAM allocated to HugeTLB memory pages for use by MySQL. There are still several gigs available for the Zabbix process, though.

9512:20100910:181931.771 === Backtrace: ===
9512:20100910:181931.809 11: /usr/local/sbin/zabbix_server(print_fatal_info+0xd9) [0x46f359]
9512:20100910:181931.809 10: /usr/local/sbin/zabbix_server(child_signal_handler+0xeb) [0x46ebfb]
9512:20100910:181931.809 9: /lib64/libc.so.6 [0x3c920302d0]
9512:20100910:181931.809 8: /usr/local/sbin/zabbix_server [0x46b8be]
9512:20100910:181931.809 7: /usr/local/sbin/zabbix_server(__zbx_mem_realloc+0x21f) [0x46c0bf]
9512:20100910:181931.809 6: /usr/local/sbin/zabbix_server(zbx_vector_uint64_reserve+0x20) [0x46e660]
9512:20100910:181931.809 5: /usr/local/sbin/zabbix_server(DCsync_configuration+0x1030) [0x46a610]
9512:20100910:181931.809 4: /usr/local/sbin/zabbix_server(main_dbconfig_loop+0x4a) [0x4475ca]
9512:20100910:181931.809 3: /usr/local/sbin/zabbix_server(MAIN_ZABBIX_ENTRY+0x4c9) [0x446be9]
9512:20100910:181931.809 2: /usr/local/sbin/zabbix_server(daemon_start+0x20e) [0x46e9de]
9512:20100910:181931.809 1: /lib64/libc.so.6(__libc_start_main+0xf4) [0x3c9201d994]
9512:20100910:181931.809 0: /usr/local/sbin/zabbix_server [0x43b4d9]