/tmp/swap is causing my CPU busy

[Bill Yuan]

Hi,
Need support here. I just noticed my machine is busy and a process is the
root cause, I am not familiar with the memory/SWAP, Can someone please help
to take a look? any info is required? please let me know.

#top
52 processes:  1 running, 50 sleeping, 1 zombie
CPU:  3.5% user,  0.0% nice,  0.6% system,  0.0% interrupt, 95.9% idle
Mem: 53M Active, 997M Inact, 133M Wired, 44M Buf, 791M Free
Swap: 2100M Total, 2100M Free

  PID USERNAME       THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU
COMMAND
25592 root            10  25    0   778M  9272K uwait   3   0:38  19.02%
.swap
25599 root             1  20    0  7416K  2596K CPU0    0   0:00   0.11% top

#ps -axd | grep swap
25481  0  S+       0:00.00 | |   `-- grep swap
22927  -  Ss     172:10.74 |-- /tmp/.swap

#uname -a
FreeBSD NetGate1 11.0-RELEASE-p1 FreeBSD 11.0-RELEASE-p1 #0 r306420: Thu
Sep 29 03:40:55 UTC 2016
root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
 i386

Regards,
Bycn82