The !wdfkd.wdfumdevstacks extension displays information about all UMDF device stacks in the implicit process.
Optional. Specifies the type of information to be displayed. Flags can be any combination of the following bits. The default value is 0x01.
For more information, see Kernel-Mode Driver Framework Debugging.
You can use this command in a kernel-mode debugging session or in a user-mode debugging session that is attached to the UMDF host process (wudfhost.exe).
This command displays the same information as the user-mode command !wudfext.umdevstacks.
Before you use this command, use !process to get a list of all UMDF host processes.
0: kd> !process 0 0 wudfhost.exe PROCESS ffffe00000c32900 SessionId: 0 Cid: 079c Peb: 7ff782537000 ParentCid: 037c DirBase: 607af000 ObjectTable: ffffc00009807940 HandleCount: <Data Not Accessible> Image: WUDFHost.exe
The preceding output shows that there is one UMDF host process; that is, there is one instance of wudfhost.exe.
Next use .process to set the implicit process to wudfhost.exe.
0: kd> .process /P ffffe00000c32900 Implicit process is now ffffe000`00c32900 .cache forcedecodeptes done
Now use !wdfkd.wdfumdevstacks to display the UMDF device stacks in the implicit process (wudfhost.exe).
0: kd> !wdfkd.wdfumdevstacks Number of device stacks: 1 Device Stack: 0x000000a5a3ab5f70 Pdo Name: \Device\00000052 Active: Yes Number of UM devices: 1 Device 0 Driver Config Registry Path: MyUmdf2Driver UMDriver Image Path: C:\WINDOWS\System32\drivers\UMDF\MyUmdf2Driver.dll FxDriver: 0xa5a3acaaa0 FxDevice: 0xa5a3ac4fc0 Open UM files (use !wdfumfile <addr> for details): <None> Device XFerMode: Deferred RW: Buffered CTL: Buffered DevStack XFerMode: Deferred RW: Buffered CTL: Buffered
The preceding output shows that there is one UMDF device stack in the implicit process. You can also see that the device stack has one device object (Number of UM devices: 1).