Windows 7: BSOD - Believe since GP push of screensaver/idle lockout - 1000007e

....
*** WARNING: Unable to verify timestamp for dlkmd.sys
*** ERROR: Module load completed but symbols could not be loaded for dlkmd.sys
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Use !analyze -v to get detailed debugging information.

BugCheck 1000007E, {ffffffffc0000005, fffff8800555cd12, fffff8800de94be8, fffff8800de94440}

Probably caused by : dlkmd.sys ( dlkmd+19d12 )

Followup: MachineOwner
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3: kd> !analyze -v
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SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M (1000007e)
This is a very common bugcheck.  Usually the exception address pinpoints
the driver/function that caused the problem.  Always note this address
as well as the link date of the driver/image that contains this address.
Some common problems are exception code 0x80000003.  This means a hard
coded breakpoint or assertion was hit, but this system was booted
/NODEBUG.  This is not supposed to happen as developers should never have
hardcoded breakpoints in retail code, but ...
If this happens, make sure a debugger gets connected, and the
system is booted /DEBUG.  This will let us see why this breakpoint is
happening.
Arguments:
Arg1: ffffffffc0000005, The exception code that was not handled
Arg2: fffff8800555cd12, The address that the exception occurred at
Arg3: fffff8800de94be8, Exception Record Address
Arg4: fffff8800de94440, Context Record Address

Debugging Details:
------------------


EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.

FAULTING_IP: 
dlkmd+19d12
fffff880`0555cd12 48833f00        cmp     qword ptr [rdi],0

EXCEPTION_RECORD:  fffff8800de94be8 -- (.exr 0xfffff8800de94be8)
ExceptionAddress: fffff8800555cd12 (dlkmd+0x0000000000019d12)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 0000000000000000
   Parameter[1]: 0000000000000000
Attempt to read from address 0000000000000000

CONTEXT:  fffff8800de94440 -- (.cxr 0xfffff8800de94440)
rax=0000000000000000 rbx=fffffa800a0a4000 rcx=1e7247a8f6980000
rdx=00000000000000a0 rsi=fffffa800a0a4000 rdi=0000000000000000
rip=fffff8800555cd12 rsp=fffff8800de94e20 rbp=0000000000000001
 r8=0000000000000065  r9=0000000000000000 r10=0000000000000000
r11=fffff8800de94e10 r12=0000000000000000 r13=fffff880055979a0
r14=fffff8800558c110 r15=fffff880055978c0
iopl=0         nv up ei ng nz ac pe cy
cs=0010  ss=0018  ds=002b  es=002b  fs=0053  gs=002b             efl=00010293
dlkmd+0x19d12:
fffff880`0555cd12 48833f00        cmp     qword ptr [rdi],0 ds:002b:00000000`00000000=????????????????
Resetting default scope

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  NULL_DEREFERENCE

PROCESS_NAME:  csrss.exe

CURRENT_IRQL:  0

ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.

EXCEPTION_PARAMETER1:  0000000000000000

EXCEPTION_PARAMETER2:  0000000000000000

READ_ADDRESS: GetPointerFromAddress: unable to read from fffff800032c4100
GetUlongFromAddress: unable to read from fffff800032c41c0
 0000000000000000 Nonpaged pool

FOLLOWUP_IP: 
dlkmd+19d12
fffff880`0555cd12 48833f00        cmp     qword ptr [rdi],0

BUGCHECK_STR:  0x7E

LAST_CONTROL_TRANSFER:  from fffffa800a0a4000 to fffff8800555cd12

STACK_TEXT:  
fffff880`0de94e20 fffffa80`0a0a4000 : fffffa80`0a0a4000 00000000`00000001 fffffa80`0a0a4000 00000000`401e034c : dlkmd+0x19d12
fffff880`0de94e28 fffffa80`0a0a4000 : 00000000`00000001 fffffa80`0a0a4000 00000000`401e034c 00000000`00d1d100 : 0xfffffa80`0a0a4000
fffff880`0de94e30 00000000`00000001 : fffffa80`0a0a4000 00000000`401e034c 00000000`00d1d100 00000001`00000001 : 0xfffffa80`0a0a4000
fffff880`0de94e38 fffffa80`0a0a4000 : 00000000`401e034c 00000000`00d1d100 00000001`00000001 00000000`00000000 : 0x1
fffff880`0de94e40 00000000`401e034c : 00000000`00d1d100 00000001`00000001 00000000`00000000 00000000`00000002 : 0xfffffa80`0a0a4000
fffff880`0de94e48 00000000`00d1d100 : 00000001`00000001 00000000`00000000 00000000`00000002 fffff880`0555ce3a : 0x401e034c
fffff880`0de94e50 00000001`00000001 : 00000000`00000000 00000000`00000002 fffff880`0555ce3a fffffa80`0a36b000 : 0xd1d100
fffff880`0de94e58 00000000`00000000 : 00000000`00000002 fffff880`0555ce3a fffffa80`0a36b000 00000000`00000002 : 0x00000001`00000001


SYMBOL_STACK_INDEX:  0

SYMBOL_NAME:  dlkmd+19d12

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: dlkmd

IMAGE_NAME:  dlkmd.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  4fb31c0e

STACK_COMMAND:  .cxr 0xfffff8800de94440 ; kb

FAILURE_BUCKET_ID:  X64_0x7E_dlkmd+19d12

BUCKET_ID:  X64_0x7E_dlkmd+19d12

Followup: MachineOwner
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