Over the top CPU usage with 4BSD scheduler

last pid: 30765;  load averages:  0.89,  0.93,  1.04    up 0+04:06:13  17:43:24
59 processes:  1 running, 58 sleeping
CPU states: 13.6% user,  0.0% nice, 10.1% system,  2.3% interrupt, 73.9% idle
Mem: 66M Active, 121M Inact, 46M Wired, 9352K Cache, 34M Buf, 648K Free
Swap: 512M Total, 69M Used, 442M Free, 13% Inuse

  PID USERNAME PRI NICE   SIZE    RES STATE    TIME   WCPU    CPU COMMAND
30765 root      20    0   175M 13496K kserel   0:29 132.15% 110.35% jar


This is a very current kernel (less than 10 hrs old) and also the
first time I've seen >100% cpu usage. Is there anything I can help
diagnose this? I was compiling jdk14 with native compiler when this
happened.

Jiawei Ye