KeBugCheckEx function (wdm.h)

The KeBugCheckEx routine brings down the system in a controlled manner when the caller discovers an unrecoverable inconsistency that would corrupt the system if the caller continued to run.


void KeBugCheckEx(
  [in] ULONG     BugCheckCode,
  [in] ULONG_PTR BugCheckParameter1,
  [in] ULONG_PTR BugCheckParameter2,
  [in] ULONG_PTR BugCheckParameter3,
  [in] ULONG_PTR BugCheckParameter4


[in] BugCheckCode

Specifies a value that indicates the reason for the bug check.

[in] BugCheckParameter1

[in] BugCheckParameter2

[in] BugCheckParameter3

[in] BugCheckParameter4

The four BugCheckParameterX values supply additional information, such as the address and data where a memory-corruption error occurred, depending on the value of BugCheckCode.

Return value



A bug check is a system-detected error that causes an immediate, controlled shutdown of the system. Various kernel-mode components perform run-time consistency checking. When such a component discovers an unrecoverable inconsistency, it causes a bug check to be generated.

Whenever possible, all kernel-mode components should log an error and continue to run, rather than calling KeBugCheckEx. For example, if a driver is unable to allocate required resources, it should log an error so that the system continues to run; it must not generate a bug check.

A driver or other kernel-mode component should call this routine only in cases of a fatal, unrecoverable error that could corrupt the system itself.

KeBugCheckEx can be useful in the early stages of developing a driver, or while it is undergoing testing. In these circumstances, the BugCheckCode passed to this routine should be distinct from those codes already in use by Windows or its drivers. For a list of these codes, see Bug Check Codes.

However, even during driver development, this routine is of only limited utility, since it results in a complete system shutdown. A more effective debugging method is to attach a kernel debugger to the system and then use routines that send messages to the debugger or break into the debugger. For further information, see Using Debugging Code in a Driver.


Requirement Value
Minimum supported client Available in Windows 2000 and later versions of Windows.
Target Platform Universal
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL Any level

See also