(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 4
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(win32ss/gdi/ntgdi/region.c:3553) NtGdiCombineRgn invalid parameters: 4F0400B5, 4F0400B5, 00000000, 2
(ntoskrnl/mm/ARM3/pool.c:618) FAILED to allocate 4294966928 bytes from paged pool
(win32ss/gdi/ntgdi/region.c:2249) Could not allocate region buffer

*** Assertion failed: pRgn->prgnattr
***   Source File: win32ss/gdi/ntgdi/region.c, line 2458

Break repeatedly, break Once, Ignore, terminate Process or terminate Thread (boipt)? 
kdb:> b
Execute '.cxr F6353D14' to dump context

Entered debugger on embedded INT3 at 0x0008:0x8058AF45.
kdb:> bt
Eip:
<ntoskrnl.exe:18af46 (:0 (DbgBreakPoint))>
Frames:
<win32k.sys:df68f (win32ss/gdi/ntgdi/region.c:2458 (REGION_vCleanup))>
<win32k.sys:c9f8d (win32ss/gdi/ntgdi/gdiobj.c:615 (GDIOBJ_vFreeObject))>
<win32k.sys:ca237 (win32ss/gdi/ntgdi/gdiobj.c:684 (GDIOBJ_vDereferenceObject))>
<win32k.sys:cae6a (win32ss/gdi/ntgdi/gdiobj.c:1141 (GDIOBJ_vDeleteObject))>
<win32k.sys:df309 (win32ss/gdi/ntgdi/region.c:2249 (REGION_AllocRgnWithHandle))>
<win32k.sys:df4a1 (win32ss/gdi/ntgdi/region.c:2318 (REGION_AllocUserRgnWithHandle))>
<win32k.sys:e18b5 (win32ss/gdi/ntgdi/region.c:3675 (NtGdiCreateRoundRectRgn))>
<win32k.sys:e1b63 (win32ss/gdi/ntgdi/region.c:3596 (NtGdiCreateEllipticRgn))>
<ntoskrnl.exe:3fe5 (:0 (KiSystemCallTrampoline))>
<ntoskrnl.exe:14df09 (ntoskrnl/ke/i386/traphdlr.c:1840 (KiSystemServiceHandler))>
<ntoskrnl.exe:3e2f (:0 (KiFastCallEntry))>
<ntdll.dll:10125>
<NonClient.exe:141b>
<NonClient.exe:1b33>
<NonClient.exe:1cbc>
<user32.dll:6791d>
<user32.dll:5b511>
<user32.dll:5dac5>
<ntdll.dll:10078>
<user32.dll:40f06>--- Press q to abort, any other key to continue ---

<uxtheme.dll:fd7d>
<user32.dll:41f09>
<NonClient.exe:1cf9>
<user32.dll:6791d>
<user32.dll:5b511>
<user32.dll:5dac5>
<ntdll.dll:10078>
<user32.dll:4036e>
<user32.dll:40f06>
<uxtheme.dll:fd7d>
<user32.dll:41f09>
<NonClient.exe:1cf9>
<user32.dll:6791d>
<user32.dll:5b511>
<user32.dll:5dac5>
<ntdll.dll:10078>
<user32.dll:40f06>
<uxtheme.dll:fd7d>
<user32.dll:41f09>
<NonClient.exe:1cf9>
<user32.dll:6791d>--- Press q to abort, any other key to continue ---

<user32.dll:596ea>
<user32.dll:5c057>
<user32.dll:5c5b6>
<NonClient.exe:1dd7>
<NonClient.exe:7562>
kdb:>