Index: message.c
===================================================================
--- message.c	(Revision 68685)
+++ message.c	(Arbeitskopie)
@@ -2870,6 +2870,7 @@
     NTSTATUS Status;
     HANDLE Handles[3];
     LARGE_INTEGER Timeout;
+	KAPC_STATE ApcState;
 
     UserEnterExclusive();
 
@@ -2887,6 +2888,7 @@
         return WAIT_FAILED;
     }
 
+
     pti = PsGetCurrentThreadWin32Thread();
 
     W32Process = (PPROCESSINFO)Process->Win32Process;
@@ -2915,6 +2917,8 @@
     if (dwMilliseconds != INFINITE)
        Timeout.QuadPart = (LONGLONG) dwMilliseconds * (LONGLONG) -10000;
 
+	KeStackAttachProcess(&Process->Pcb, &ApcState);
+
     W32Process->W32PF_flags |= W32PF_WAITFORINPUTIDLE;
     for (pti = W32Process->ptiList; pti; pti = pti->ptiSibling)
     {
@@ -2922,6 +2926,8 @@
        pti->pClientInfo->dwTIFlags = pti->TIF_flags;
     }
 
+	KeUnstackDetachProcess(&ApcState);
+
     TRACE("WFII: ppi %p\n", W32Process);
     TRACE("WFII: waiting for %p\n", Handles[1] );