Weird problem with rand_harvestq

[sadegh solati]

Hi,
I am using FreeBSD 10.0-RELEASE #0 r260789.
the following lines are a section of ps command out put on my server.
as you see in second line rand_harvestq made completely busy one core my
four cores CPU .
The OS got very slow and top output doesn't show cpu usage .

top output
========================

last pid: 40488;  load averages:  2.57,  0.69,  0.34
                                                 up 6+22:29:24  11:38:01
74 processes:  2 running, 72 sleeping
CPU:     % user,     % nice,     % system,     % interrupt,     % idle
Mem: 50M Active, 1128M Inact, 718M Wired, 1780K Cache, 622M Buf, 4040M Free
Swap: 4096M Total, 4096M Free

ps output
=========================
USER      PID  %CPU %MEM   VSZ   RSS TT  STAT STARTED        TIME COMMAND
root       11 300.0  0.0     0    64  -  R<L  Sun01PM 47620:20.47 [idle]
root       14 100.0  0.0     0    16  -  DNL  Sun01PM     1:29.31
[rand_harvestq]


any help would be appreciated.
thanks