1221:20180611:095108.712 === Backtrace: ===
  1221:20180611:095109.278 19: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](zbx_log_fatal_info+0x176) [0x561dc9d2c076]
  1221:20180611:095109.278 18: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0xf7505) [0x561dc9d2c505]
  1221:20180611:095109.278 17: /lib/x86_64-linux-gnu/libc.so.6(+0x354b0) [0x7f731142d4b0]
  1221:20180611:095109.278 16: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0xdeed6) [0x561dc9d13ed6]
  1221:20180611:095109.278 15: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](DCexpression_expand_user_macros+0x45) [0x561dc9d13f90]
  1221:20180611:095109.278 14: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0xb27de) [0x561dc9ce77de]
  1221:20180611:095109.278 13: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](substitute_simple_macros+0x4337) [0x561dc9cf0197]
  1221:20180611:095109.278 12: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](substitute_simple_macros+0x2369) [0x561dc9cee1c9]
  1221:20180611:095109.278 11: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0x7a089) [0x561dc9caf089]
  1221:20180611:095109.278 10: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0x7cb26) [0x561dc9cb1b26]
  1221:20180611:095109.278 9: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0x7e012) [0x561dc9cb3012]
  1221:20180611:095109.278 8: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0x7eade) [0x561dc9cb3ade]
  1221:20180611:095109.278 7: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](+0x7f70d) [0x561dc9cb470d]
  1221:20180611:095109.278 6: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](escalator_thread+0x192) [0x561dc9cb4921]
  1221:20180611:095109.278 5: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](zbx_thread_start+0x37) [0x561dc9d39b15]
  1221:20180611:095109.278 4: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](MAIN_ZABBIX_ENTRY+0xa94) [0x561dc9c75679]
  1221:20180611:095109.278 3: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](daemon_start+0x31f) [0x561dc9d2b6ce]
  1221:20180611:095109.278 2: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](main+0x30a) [0x561dc9c74bcf]
  1221:20180611:095109.278 1: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f7311418830]
  1221:20180611:095109.278 0: /usr/sbin/zabbix_server: escalator #1 [processed 0 escalations in 0.010709 sec, processing escalations](_start+0x29) [0x561dc9c67e99]