用WINDBG发现错误,请大家帮忙解决

Built by: 2600.xpsp.080413-2111
Kernel base = 0x804d8000 PsLoadedModuleList = 0x8055c1c0
Debug session time: Thu Nov 20 15:08:38.013 2008 (GMT+8)
System Uptime: 0 days 0:25:46.541
Access violation - code c0000005 (!!! second chance !!!)
f5cb566c 3a18            cmp     bl,byte ptr [eax]


CALL STACK

WARNING: Frame IP not in any known module. Following frames may be wrong.
00000758 00000000 00000000 0xf5cb566c
badb0d00 05affa50 00d4d0c8 nt!ZwYieldExecution+0xb78
05affa50 00d4d0c8 00d4d0c8 0x7c92e4f4
00d4d0c8 00d4d0c8 00000000 0xbadb0d00
00d4d0c8 00000000 00000000 0x5affa50
00000000 00000000 00000000 0xd4d0c8
00000000 00000000 00000000 0xd4d0c8

PsLoadedModuleList是得到一个内核module链表的地址
访问违例，看不出来什么东西，信息太少了...

加载上此驱动的.PDB文件，可以kb就可以看到出问题的位置！