WXP TaskMgr: each refresh triggers 3 'Assertion failed: UserIsEnteredExclusive()'

(/win32ss/user/winsrv/usersrv/init.c:152) GetThreadConsoleDesktop(1112) failed with Status 0xc0000008

(/win32ss/user/winsrv/usersrv/init.c:152) GetThreadConsoleDesktop(1112) failed with Status 0xc0000008

(/win32ss/user/winsrv/usersrv/init.c:152) GetThreadConsoleDesktop(1112) failed with Status 0xc0000008

(/win32ss/user/winsrv/usersrv/init.c:152) GetThreadConsoleDesktop(1112) failed with Status 0xc0000008

(/win32ss/user/winsrv/usersrv/init.c:152) GetThreadConsoleDesktop(1112) failed with Status 0xc0000008

*** Assertion failed: UserIsEnteredExclusive()

***   Source File: /win32ss/user/ntuser/usrheap.h, line 37

Break repeatedly, break Once, Ignore, terminate Process or terminate Thread (boipt)?

kdb:> o

Execute '.cxr FBDA77E0' to dump context

Entered debugger on embedded INT3 at 0x0008:0x80589F89.

kdb:> bt

Eip:

<ntoskrnl.exe:189f8a (srv/buildbot/worker_data/Build_GCCLin_x86/build/sdk/lib/rtl/i386/debug_asm.S:33 (DbgBreakPoint))>

Frames:

<win32k.sys:35728 (win32ss/user/ntuser/usrheap.h:37 (IntMapDesktopView))>

<win32k.sys:36820 (win32ss/user/ntuser/desktop.c:210 (IntDesktopObjectOpen))>

<ntoskrnl.exe:3bc46 (ntoskrnl/ex/win32k.c:97 (ExpWin32SessionCallout))>

<ntoskrnl.exe:3bdcd (ntoskrnl/ex/win32k.c:230 (ExpDesktopOpen))>

<ntoskrnl.exe:107dcc (ntoskrnl/ob/obhandle.c:994 (ObpIncrementHandleCount))>

<ntoskrnl.exe:108e26 (ntoskrnl/ob/obhandle.c:1560 (ObpCreateHandle))>

<ntoskrnl.exe:10a1c4 (ntoskrnl/ob/obhandle.c:2664 (ObOpenObjectByName))>

<win32k.sys:39c6f (win32ss/user/ntuser/desktop.c:2553 (NtUserOpenDesktop))>

<ntoskrnl.exe:3fe5 (:0 (KiSystemCallTrampoline))>

<ntoskrnl.exe:14cf19 (ntoskrnl/ke/i386/traphdlr.c:1840 (KiSystemServiceHandler))>

<ntoskrnl.exe:3e2f (:0 (KiFastCallEntry))>

<ntdll.dll:10125>

<taskmgr_xp.exe:ea03>

<user32.dll:35a5a>

<user32.dll:2c4ea>

<taskmgr_xp.exe:ed51>

<user32.dll:35a5a>

<user32.dll:35c04>

<taskmgr_xp.exe:d8f9>

<kernel32.dll:1c8c7>

kdb:> cont

[...]