diff -r 0ff03867bdb6 -r 39b39e1a406e kernel/eka/memmodel/epoc/flexible/mmu/mpagearray.cpp
--- a/kernel/eka/memmodel/epoc/flexible/mmu/mpagearray.cpp	Wed Jul 21 14:46:58 2010 +0100
+++ b/kernel/eka/memmodel/epoc/flexible/mmu/mpagearray.cpp	Thu Jul 22 16:46:39 2010 +0100
@@ -1158,6 +1158,7 @@
 		return NULL;
 
 	*p = (page & ~EStateMask) | EMoving;
+	s->Lock();
 
 	aPageList.Set(iSegments, aIndex, aIndex+1);