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virtualboxwindbgwdk

I can not understand symbol files functioning properly

I'm studying kernel mode driver following to this Youtube video and preparing for debugging a driver in a VirtualBox VM, with WinDbg and Virtual KD.

I set up the symbol file by clicking

  1. File / Symbol file path

  2. add symbol path 

    SRV*c:\symbols* http://msdl.microsoft.com/download/symbols

  3. put a check mark to "reload" item

  4. click ok

After that, Windbg's screen is as follows:

************* Path validation summary **************
Response                         Time (ms)     Location
Deferred                                       SRV*c:\symbols*             http://msdl.microsoft.com/download/symbols
kd> .reload
Connected to Windows 10 17134 x64 target at (Sun Oct  7 13:16:30.147 2018     (UTC + 9:00)), ptr64 TRUE
Loading Kernel Symbols
...............................................................
................................................................
..........................
Loading User Symbols

Loading unloaded module list
......Unable to enumerate user-mode unloaded modules, Win32 error 0n30

I can not understand symbol files functioning properly.

Are Symbol files currently not available?

Solution

  • I use lml command in such case.

    If symbol files are loaded, you can find module name like this.

    2: kd> lml
start             end                 module name
ffff9e54`ba960000 ffff9e54`ba9d7000   win32k     (pdb symbols)          c:\symbols\win32k.pdb\901A464ABCFD2696F50FFB02C607B4661\win32k.pdb
fffff803`6921a000 fffff803`69aef000   nt         (pdb symbols)          c:\symbols\ntkrnlmp.pdb\9378084E8DBD4AB1A155099BCE693E341\ntkrnlmp.pdb