RP/0/RP0/CPU0:R4#show ospf trace all | include 192.0.2
Tue Sep 22 16:45:41.445 UTC
98   Sep 22 16:40:07.424  ospf_rib_route_header: Already have the ctlblk for this prefix 192.0.2.0 len 24 ctlblk distance is 256 new distance is 110
RP/0/RP0/CPU0:R4#show ospf trace errors
Tue Sep 22 16:46:01.369 UTC

Traces for OSPF 1 (Tue Sep 22 16:46:02)
Traces returned/requested/available:  3/8192/3
Trace buffer: errors

1    Sep 22 16:17:52.639  ospf_nsr_ev_free: Cannot free event 0xb693cfc0: flags 0x0,work 0x62dd32fbd3d0, handler 0x62dd019e302e
2    Sep 22 16:17:52.639  ospf_nsr_ev_free:   inst 0x0, nsr_info 0x0, next 0x0
3    Sep 22 16:17:52.655  ospf_is_config_startup_done: Reading config startup done tuple failed [errno 0x40818600: 'sysdb' detected the 'warning' condition 'A SysDB client tried to access a nonexistent item or list an empty directory']