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PAGE_FAULT_IN_NONPAGED_AREA (50)
Invalid system memory was referenced.  This cannot be protected by try-except,
it must be protected by a Probe.  Typically the address is just plain bad or it
is pointing at freed memory.
Arguments:
Arg1: ffffff55, memory referenced.
Arg2: 00000001, value 0 = read operation, 1 = write operation.
Arg3: bf81408f, If non-zero, the instruction address which referenced the bad memory
 address.
Arg4: 00000000, (reserved)
Debugging Details:
------------------
 
Could not read faulting driver name
WRITE_ADDRESS:  ffffff55 
FAULTING_IP: 
win32k!xxxSendMessageTimeout+5b
bf81408f 0f83d1feffff    jae     win32k!xxxSendMessageTimeout+0x5d (bf813f66)
MM_INTERNAL_CODE:  0
CUSTOMER_CRASH_COUNT:  1
DEFAULT_BUCKET_ID:  DRIVER_FAULT
BUGCHECK_STR:  0x50
PROCESS_NAME:  everest.exe
LAST_CONTROL_TRANSFER:  from bf80ec76 to bf81408f
STACK_TEXT:  
f76c6c54 bf80ec76 b9e9f870 00000084 00000000 win32k!xxxSendMessageTimeout+0x5b
f76c6c78 bf820d24 b9e9f870 00000084 00000000 win32k!xxxSendMessage+0x1b
f76c6cac bf820d9b b9e9f870 00000171 000002ba win32k!xxxWindowHitTest2+0x139
f76c6cdc bf820cde b9ea12d0 00000171 000002ba win32k!xxxWindowHitTest+0x41
f76c6d14 bf8213d1 b9e606e8 00000171 000002ba win32k!xxxWindowHitTest2+0xfd
f76c6d40 bf82137c 00000171 000002ba 020afb54 win32k!xxxWindowFromPoint+0x3a
f76c6d54 804de7ec 00000171 000002ba 020afbbc win32k!NtUserWindowFromPoint+0x16
f76c6d54 7c90e514 00000171 000002ba 020afbbc nt!KiFastCallEntry+0xf8
WARNING: Frame IP not in any known module. Following frames may be wrong.
020afbbc 00000000 00000000 00000000 00000000 0x7c90e514
 
STACK_COMMAND:  kb
FOLLOWUP_IP: 
win32k!xxxSendMessageTimeout+5b
bf81408f 0f83d1feffff    jae     win32k!xxxSendMessageTimeout+0x5d (bf813f66)
SYMBOL_STACK_INDEX:  0
SYMBOL_NAME:  win32k!xxxSendMessageTimeout+5b
FOLLOWUP_NAME:  MachineOwner
MODULE_NAME: win32k
IMAGE_NAME:  win32k.sys
DEBUG_FLR_IMAGE_TIMESTAMP:  4a85564b
FAILURE_BUCKET_ID:  0x50_win32k!xxxSendMessageTimeout+5b
BUCKET_ID:  0x50_win32k!xxxSendMessageTimeout+5b
Followup: MachineOwner

kd> k
ChildEBP RetAddr  
f76c6c54 bf80ec76 win32k!xxxSendMessageTimeout+0x5b
f76c6c78 bf820d24 win32k!xxxSendMessage+0x1b
f76c6cac bf820d9b win32k!xxxWindowHitTest2+0x139
f76c6cdc bf820cde win32k!xxxWindowHitTest+0x41
f76c6d14 bf8213d1 win32k!xxxWindowHitTest2+0xfd
f76c6d40 bf82137c win32k!xxxWindowFromPoint+0x3a
f76c6d54 804de7ec win32k!NtUserWindowFromPoint+0x16
f76c6d54 7c90e514 nt!KiFastCallEntry+0xf8
WARNING: Frame IP not in any known module. Following frames may be wrong.
020afbbc 00000000 0x7c90e514

win32k!xxxSendMessageTimeout:
bf814076 56                     push    esi
bf814077 8b7508               mov     esi,dword ptr [ebp+8]
bf81407a 83feff                 cmp     esi,0FFFFFFFFh
bf81407d 0f84affeffff          je      win32k!xxxSendMessageTimeout+0x1b (bf813f32) 
bf814083 53                     push    ebx
bf814084 8b5d0c               mov     ebx,dword ptr [ebp+0Ch]
bf814087 57                     push    edi
bf814088 bfe0030000         mov     edi,3E0h
bf81408d 3bdf                  cmp     ebx,edi
bf81408f 0f83d1feffff         jae     win32k!xxxSendMessageTimeout+0x5d (bf813f66) [br=0]
bf814095 8b3df8e29abf      mov     edi,dword ptr [win32k!gptiCurrent (bf9ae2f8)]
bf81409b 3b7e08               cmp     edi,dword ptr [esi+8]
bf81409e 7567                  jne     win32k!xxxSendMessageTimeout+0xa5 (bf814107)
bf8140a0 8b4740               mov     eax,dword ptr [edi+40h]
bf8140a3 8b400c               mov     eax,dword ptr [eax+0Ch]
bf8140a6 0b8798000000     or      eax,dword ptr [edi+98h]
bf8140ac a820                  test    al,20h
bf8140ae 0f8512ffffff          jne     win32k!xxxSendMessageTimeout+0x134 (bf813fc6)
bf8140b4 f6461604            test    byte ptr [esi+16h],4
bf8140b8 8d4518               lea     eax,[ebp+18h]