Rollback last change since it was incorrect.
See http://www.reactos.com/bugzilla/show_bug.cgi?id=36

reactos/ntoskrnl/ps

diff -u -r1.78 -r1.79
--- kill.c	3 Oct 2004 18:53:05 -0000	1.78
+++ kill.c	3 Oct 2004 21:03:03 -0000	1.79
@@ -1,4 +1,4 @@

-/* $Id: kill.c,v 1.78 2004/10/03 18:53:05 gvg Exp $

+/* $Id: kill.c,v 1.79 2004/10/03 21:03:03 gvg Exp $

  *
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS kernel

@@ -114,7 +114,6 @@

    PEPROCESS CurrentProcess;
    SIZE_T Length = PAGE_SIZE;
    PVOID TebBlock;

-   ULONG StackSize;

 
    KeLowerIrql(PASSIVE_LEVEL);
 

@@ -148,14 +147,9 @@

    PspRunCreateThreadNotifyRoutines(CurrentThread, FALSE);
    PsTerminateWin32Thread(CurrentThread);
 

-   /* Free the usermode stack and the TEB */

+   /* Free the TEB */

    if(CurrentThread->Tcb.Teb)
    {

-     StackSize = 0;
-     ZwFreeVirtualMemory(NtCurrentProcess(),
-                         &CurrentThread->Tcb.Teb->DeallocationStack,
-                         &StackSize,
-                         MEM_RELEASE);

      DPRINT("Decommit teb at %p\n", CurrentThread->Tcb.Teb);
      ExAcquireFastMutex(&CurrentProcess->TebLock);
      TebBlock = MM_ROUND_DOWN(CurrentThread->Tcb.Teb, MM_VIRTMEM_GRANULARITY);

reactos/lib/rosrtl/thread

diff -u -r1.2 -r1.3
--- exit.c	3 Oct 2004 18:53:05 -0000	1.2
+++ exit.c	3 Oct 2004 21:03:06 -0000	1.3
@@ -1,4 +1,4 @@

-/* $Id: exit.c,v 1.2 2004/10/03 18:53:05 gvg Exp $

+/* $Id: exit.c,v 1.3 2004/10/03 21:03:06 gvg Exp $

 */
 /*
 */

@@ -11,12 +11,27 @@

 
 #include <rosrtl/thread.h>
 

+static VOID NTAPI RtlRosExitUserThread_Stage2
+(
+ IN ULONG_PTR Status
+)
+{
+ RtlRosFreeUserThreadStack(NtCurrentProcess(), NtCurrentThread());
+ NtTerminateThread(NtCurrentThread(), Status);
+}
+

 __declspec(noreturn) VOID NTAPI RtlRosExitUserThread
 (
  IN NTSTATUS Status
 )
 {

- NtTerminateThread(NtCurrentThread(), Status);

+ RtlRosSwitchStackForExit
+ (
+  NtCurrentTeb()->StaticUnicodeBuffer,
+  sizeof(NtCurrentTeb()->StaticUnicodeBuffer),
+  RtlRosExitUserThread_Stage2,
+  Status
+ );

 
  for(;;);
 }