WIP: win32k: MsqCleanupMessageQueue randomly crashes livecd during startup

Part of log from VirtualBox:

err:(dll\win32\wininet\urlcache.c:551) Couldn't get path for default container 2
fixme:(dll\win32\user32\windows\cursoricon.c:1002) Copying from resource isn't implemented yet
fixme:(dll\win32\user32\windows\cursoricon.c:1002) Copying from resource isn't implemented yet
fixme:(dll\win32\user32\windows\cursoricon.c:1002) Copying from resource isn't implemented yet
fixme:(dll\win32\user32\windows\cursoricon.c:1002) Copying from resource isn't implemented yet
(ntoskrnl\io\pnpmgr\pnpmgr.c:1819) PCI\VEN_8086&DEV_1237&SUBSYS_00000000&REV_02\1&f103bba4&00 is using NULL driver
Entered debugger on last-chance exception (Exception Code: 0xc0000005) (Page Fault)
Memory at 0x00000000 could not be written: Page not present.
kdb:> bt
Eip:
<win32k.sys:6ee39 (include/ddk/wdm.h:8187 (@MsqCleanupMessageQueue@4))>
Frames:
<win32k.sys:6ef8e (subsystems/win32/win32k/ntuser/msgqueue.c:1606 (@MsqDestroyMessageQueue@4))>
<win32k.sys:3ea56 (subsystems/win32/win32k/main/dllmain.c:300 (Win32kThreadCallback@8))>
<ntoskrnl.exe:d1182 (ntoskrnl/ps/kill.c:693 (PspExitThread@4))>
<ntoskrnl.exe:d154b (ntoskrnl/ps/kill.c:890 (PsExitSpecialApc@20))>
<ntoskrnl.exe:89f3 (ntoskrnl/ke/apc.c:471 (KiDeliverApc@12))>
<ntoskrnl.exe:6b85 (ntoskrnl/include//internal/arch/../i386/ke.h:693 (@KiServiceExit@8))>
<00000000>
kdb:>

It seems Entry->Blink==NULL in RemoveEntryList.