我在学习《软件调试》第二章第59面，一步一步跟着做时，发现在书中第11步，显示calc的页目录数值时出现如下问题，不知道什么原因，进行不下去。当然，我在再启动一个WDB实例时，前面做的各步并未关闭。也即calc进程依然存在。
……
PROCESS 896e2b28 SessionId: 0 Cid: 07b0 Peb: 7ffdf000 ParentCid: 02e8
DirBase: 0adc0480 ObjectTable: e1089880 HandleCount: 52.
Image: calc.exe
lkd> !dd 0adc0480
Physical memory read at adc0480 failed
If you know the caching attributes used for the memory,
try specifying , [uc] or [wc], as in !dd <params>.
WARNING: Incorrect use of these flags will cause unpredictable
processor corruption. This may immediately (or at any time in
the future until reboot) result in a system hang, incorrect data
being displayed or other strange crashes and corruption.