kernel memory problem

[Benjamin Adams]

I'm trying to figure out the problem with my computer:
8 out of 10 times on boot when ssh starts loading I get:
Jul 25 00:28:40 Desktop kernel: Memory modified after free
0xffffff0053de4800(2048) val=ffffc0de @ 0xffffff0053de4800
Jul 25 00:29:18 Desktop kernel: Memory modified after free
0xffffff0053de2000(2048) val=ffffc0de @ 0xffffff0053de2000
Jul 25 00:29:19 Desktop kernel: Memory modified after free
0xffffff0053de3800(2048) val=ffffc0de @ 0xffffff0053de3800
Jul 25 00:29:20 Desktop kernel: Memory modified after free
0xffffff0053de1000(2048) val=ffffc0de @ 0xffffff0053de1000
Jul 25 00:29:21 Desktop kernel: Memory modified after free
0xffffff0053de2800(2048) val=ffffc0de @ 0xffffff0053de2800
Jul 25 00:29:22 Desktop kernel: Memory modified after free
0xffffff0053de0000(2048) val=ffffc0de @ 0xffffff0053de0000
Jul 25 00:29:23 Desktop kernel: Memory modified after free
0xffffff0053de1800(2048) val=ffffc0de @ 0xffffff0053de1800
(goes on a on until I do a cold boot)
computer will also go very very slow sometimes.

Is this a bad memory problem or something with the kernel?

uname:
7.0-CURRENT-200706 FreeBSD 7.0-CURRENT-200706 #0: Thu Jun  7 21:38:42 UTC
2007     root at stiles.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

FreeBSD amd64 7.0 200706

thanks


Ben Adams