PAGE_FAULT in DIB_BltFromVGA of vgaddi.dll

This very weird bug happens sometimes when you're using the default vga driver.

An example of backtrace is as follows:

• • • Fatal System Error: 0x00000050
      (0xE14F2000,0x00000000,0xFAECF7FB,0x00000000)

Driver at fault:

• • • vgaddi.dll - Address FAECF7FB base at FAECB000, DateStamp 54c6c0be
      .
      
      Entered debugger on embedded INT3 at 0x0008:0x8095b5e8.
      kdb:> bt
      Eip:
      <NTOSKRNL.EXE:15b5e9 (:0 (RtlpBreakWithStatusInstruction))>
      Frames:
      <NTOSKRNL.EXE:94dad (ntoskrnl/ke/bug.c:1098 (KeBugCheckWithTf))>
      <NTOSKRNL.EXE:95235 (ntoskrnl/ke/bug.c:1423 (KeBugCheckEx))>
      <NTOSKRNL.EXE:beb6c (ntoskrnl/mm/ARM3/pagfault.c:1841 (MmArmAccessFault))>
      <NTOSKRNL.EXE:f348b (ntoskrnl/mm/mmfault.c:243 (MmAccessFault))>
      <NTOSKRNL.EXE:1432b9 (ntoskrnl/ke/i386/traphdlr.c:1274 (KiTrap0EHandler))>
      <NTOSKRNL.EXE:3698 (:0 (KiTrap0E))>
      <vgaddi.dll:47f6 (win32ss/drivers/displays/vga/vgavideo/vgavideo.c:352 (DIB_BltFromVGA))>
      <vgaddi.dll:3f13 (win32ss/drivers/displays/vga/objects/copybits.c:26 (DrvCopyBits))>
      <win32k.sys:c354a (win32ss/gdi/eng/copybits.c:82 (EngCopyBits))>
      <win32k.sys:976b (win32ss/gdi/eng/bitblt.c:1075 (IntEngMaskBlt))>
      <win32k.sys:a6266 (win32ss/gdi/ntgdi/freetype.c:3725 (GreExtTextOutW))>
      <win32k.sys:a696b (win32ss/gdi/ntgdi/freetype.c:3901 (NtGdiExtTextOutW))>
      <NTOSKRNL.EXE:143e40 (ntoskrnl/include/internal/i386/ke.h:689 (KiSystemServiceHandler))>
      <NTOSKRNL.EXE:3d95 (:0 (KiFastCallEntry))>
      <ntdll.dll:c761 (:0 (KiIntSystemCall))>
      <user32.dll:42014 (win32ss/user/user32/windows/font.c:1242 (DrawTextExW))>
      <user32.dll:42940 (win32ss/user/user32/windows/font.c:1400 (DrawTextW))>
      <comctl32.dll:713c8 (dll/win32/comctl32/toolbar.c:603 (TOOLBAR_Refresh))>
      <comctl32.dll:7507c (dll/win32/comctl32/toolbar.c:6302 (ToolbarWindowProc))>
      <user32.dll:585fb (win32ss/user/user32/windows/message.c:1490 (IntCallWindowProcW))>--- Press q to abort, any other key to continue —

<user32.dll:58bac (win32ss/user/user32/windows/message.c:1804 (CallWindowProcW))>
<explorer.exe:253f6 (lib/atl/atlwin.h:441 (CWindowImplBaseT<ATL::CWindow, ATL::CWinTraits<1442840576ul, 0ul> >::WindowProc))>
<user32.dll:585fb (win32ss/user/user32/windows/message.c:1490 (IntCallWindowProcW))>
<user32.dll:5a315 (win32ss/user/user32/windows/message.c:2914 (User32CallWindowProcFromKernel))>
<ntdll.dll:c6b4 (:0 (KiUserCallbackDispatcher))>
<explorer.exe:5af6 (base/shell/explorer/traywnd.cpp:2918 (TrayMessageLoop))>
<explorer.exe:17a6 (base/shell/explorer/explorer.cpp:177 (StartWithDesktop))>
<explorer.exe:18ef (base/shell/explorer/explorer.cpp:224 (wWinMain))>
<explorer.exe:10a28 (ReactOS/lib/sdk/crt/startup/crt0_w.c:24 (wmain))>
<explorer.exe:faf0 (ReactOS/lib/sdk/crt/startup/crtexe.c:307 (__tmainCRTStartup))>
<explorer.exe:fb39 (ReactOS/lib/sdk/crt/startup/crtexe.c:168 (wWinMainCRTStartup))>
<kernel32.dll:fbe3 (dll/win32/kernel32/client/proc.c:472 (BaseProcessStartup))>
<00000000>
kdb:> cont