diff -r 2bb754abd467 -r 0ffb4e86fcc9 kernel/eka/memmodel/epoc/flexible/mmu/mpager.cpp
--- a/kernel/eka/memmodel/epoc/flexible/mmu/mpager.cpp	Mon Jun 21 17:12:14 2010 +0300
+++ b/kernel/eka/memmodel/epoc/flexible/mmu/mpager.cpp	Thu Jul 15 20:11:42 2010 +0300
@@ -929,16 +929,16 @@
 
 	if (!DiscardCanStealPage(aOldPageInfo, moveDirty))
 		{
+		// Page must be managed if it is pinned or dirty.
+		__NK_ASSERT_DEBUG(aOldPageInfo->Type()==SPageInfo::EManaged);
 		// The page is pinned or is dirty and this is a general defrag so move the page.
 		DMemoryObject* memory = aOldPageInfo->Owner();
-		// Page must be managed if it is pinned or dirty.
-		__NK_ASSERT_DEBUG(aOldPageInfo->Type()==SPageInfo::EManaged);
-		__NK_ASSERT_DEBUG(memory);
-		MmuLock::Unlock();
+		memory->Open();
 		TPhysAddr newAddr;
 		TRACE2(("DPager::DiscardPage delegating pinned/dirty page to manager"));
 		TInt r = memory->iManager->MovePage(memory, aOldPageInfo, newAddr, aBlockZoneId, blockRest);
 		TRACE(("< DPager::DiscardPage %d", r));
+		memory->AsyncClose();
 		return r;
 		}
 
@@ -1035,17 +1035,15 @@
 			AddAsFreePage(newPageInfo);
 		else
 			ReturnPageToSystem(*newPageInfo);   // temporarily releases MmuLock
-		}
+		}	
+	MmuLock::Unlock();
 
 	if (havePageCleaningLock)
 		{
 		// Release the page cleaning mutex
-		MmuLock::Unlock();
 		PageCleaningLock::Unlock();
-		MmuLock::Lock();
-		}	
-	
-	MmuLock::Unlock();
+		}
+
 	TRACE(("< DPager::DiscardPage returns %d", r));
 	return r;	
 	}