The zabbix server was configured in ubunto 18. After placing some hosts via snmp. the zabbix server service has stopped. logs.
Zabbix Server stopped. Zabbix 4.4.4 (revision 3131fdac04).
5136:20200120:135224.301 Starting Zabbix Server. Zabbix 4.4.4 (revision 3131fdac04).
5136:20200120:135224.301 ****** Enabled features ******
5136:20200120:135224.301 SNMP monitoring: YES
5136:20200120:135224.301 IPMI monitoring: YES
5136:20200120:135224.301 Web monitoring: YES
5136:20200120:135224.301 VMware monitoring: YES
5136:20200120:135224.301 SMTP authentication: YES
5136:20200120:135224.301 ODBC: YES
5136:20200120:135224.301 SSH2 support: YES
5136:20200120:135224.301 IPv6 support: YES
5136:20200120:135224.301 TLS support: YES
5136:20200120:135224.301 ******************************
5136:20200120:135224.301 using configuration file: /etc/zabbix/zabbix_server.conf
5136:20200120:135224.311 current database version (mandatory/optional): 04040000/04040000
5136:20200120:135224.311 required mandatory version: 04040000
5136:20200120:135224.317 server #0 started [main process]
5139:20200120:135224.317 server #1 started [configuration syncer #1]
5139:20200120:135224.707 __mem_malloc: skipped 0 asked 192 skip_min 18446744073709551615 skip_max 0
5139:20200120:135224.707 [file:dbconfig.c,line:94] __zbx_mem_realloc(): out of memory (requested 192 bytes)
5139:20200120:135224.707 [file:dbconfig.c,line:94] __zbx_mem_realloc(): please increase CacheSize configuration parameter
5139:20200120:135224.707 === memory statistics for configuration cache ===
5139:20200120:135224.707 free chunks of size 24 bytes: 116
5139:20200120:135224.707 free chunks of size 32 bytes: 22
5139:20200120:135224.707 free chunks of size 80 bytes: 1
5139:20200120:135224.707 min chunk size: 24 bytes
5139:20200120:135224.707 max chunk size: 80 bytes
5139:20200120:135224.707 memory of total size 8388232 bytes fragmented into 72665 chunks
5139:20200120:135224.707 of those, 3568 bytes are in 139 free chunks
5139:20200120:135224.707 of those, 7222040 bytes are in 72526 used chunks
5139:20200120:135224.707 ================================
5139:20200120:135224.707 === Backtrace: ===
5139:20200120:135224.708 15: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](zbx_backtrace+0x4e) [0x559376f8b558]
5139:20200120:135224.708 14: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](__zbx_mem_realloc+0x160) [0x559376f868e7]
5139:20200120:135224.708 13: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](+0x18ad93) [0x559376f4cd93]
5139:20200120:135224.708 12: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](+0x1cdceb) [0x559376f8fceb]
5139:20200120:135224.708 11: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](zbx_hashmap_set+0xf3) [0x559376f9010b]
5139:20200120:135224.708 10: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](zbx_binary_heap_insert+0xfc) [0x559376f8dcf3]
5139:20200120:135224.708 9: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](+0x18bbfa) [0x559376f4dbfa]
5139:20200120:135224.708 8: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](+0x19269b) [0x559376f5469b]
5139:20200120:135224.708 7: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](DCsync_configuration+0xb97) [0x559376f59fae]
5139:20200120:135224.708 6: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](dbconfig_thread+0x10c) [0x559376e116cc]
5139:20200120:135224.708 5: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](zbx_thread_start+0x37) [0x559376f995c7]
5139:20200120:135224.708 4: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](MAIN_ZABBIX_ENTRY+0x991) [0x559376e03149]
5139:20200120:135224.708 3: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](daemon_start+0x2ff) [0x559376f8ac81]
5139:20200120:135224.708 2: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](main+0x305) [0x559376e027a2]
5139:20200120:135224.708 1: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7fd2a232cb97]
5139:20200120:135224.708 0: /usr/sbin/zabbix_server: configuration syncer [syncing configuration](_start+0x2a) [0x559376e0181a]
5136:20200120:135224.711 One child process died (PID:5139,exitcode/signal:1). Exiting ...
5136:20200120:135224.711 syncing trend data...
5136:20200120:135224.711 syncing trend data done
5136:20200120:135224.711 Zabbix Server stopped. Zabbix 4.4.4 (revision 3131fdac04).
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