!wudfext.umirp

The !wudfext.umirp extension displays information about a host user-mode I/O request packet (UM IRP).

Syntax

!wudfext.umirp Address

Parameters

Address

Specifies the address of the UM IRP to display information about.

DLL

Comments

You can use the !wudfext.umirps extension command to determine the list of all outstanding UM IRPs in the host process.

Each UM IRP has one or more stack locations. Each stack location corresponds to the parameters that a single driver in the device stack will receive when it is called to handle a request.

!wudfext.umirp dumps all of the stack locations and marks the current location with a right angle bracket (>). The current location corresponds to the driver that currently owns the request. The current location changes when a driver forwards a request to the next lower driver in the stack, or when the driver completes a request that the driver owns.

The following is an example of the !wudfext.umirp display:

kd> !umirp 3dd480
UM IRP: 0x003dd480  UniqueId: 0xde  Kernel Irp: 0x0x85377850
  Type: WudfMsg_READ
  ClientProcessId: 0x338
  Device Stack: 0x0034e4e0
  IoStatus
    hrStatus: 0x0
    Information: 0x0
  Driver/Framework created IRP: No
  Data Buffer: 0x00000000 / 0
  IsFrom32BitProcess: Yes
  CancelFlagSet: No
  Cancel callback: 0x01102224
  Total number of stack locations: 2
  CurrentStackLocation: 2 (StackLocation[ 1 ])
    StackLocation[ 0 ]
      UNINITIALIZED
  > StackLocation[ 1 ]
      IWDFRequest:  ????
      IWDFDevice:   0x000f2f80
      IWDFFile:     0x003a7648
      Completion:
        Callback:   0x00000000
        Context:    0x00000000
      Parameters: (RequestType: WdfRequestRead)
        Buffer length:        0x400
        Key:                  0x00000000
        Offset:               0x0

Additional Information

For more information, see User-Mode Driver Framework Debugging.