diff -r 657f875b013e -r 73ea206103e6 userlibandfileserver/fileserver/sfile/sf_thread.cpp
--- a/userlibandfileserver/fileserver/sfile/sf_thread.cpp	Fri Jun 11 15:02:23 2010 +0300
+++ b/userlibandfileserver/fileserver/sfile/sf_thread.cpp	Wed Jun 23 19:44:53 2010 +0300
@@ -926,24 +926,34 @@
 	}
 
 
-CPluginThread::CPluginThread(CFsPlugin& aPlugin)
-  : iPlugin(aPlugin)
+CPluginThread::CPluginThread(CFsPlugin& aPlugin, RLibrary aLibrary)
+  : iPlugin(aPlugin), iLib(aLibrary)
 	{
 	/** @prototype */
 	iOperationLock.Close();
 	iPlugin.Open();
+	
+    /* 
+    Duplicate the handle to the DLL which created the plugin to prevent 
+    TFsRemovePlugin::DoRequestL() from unmapping the DLL's code segment before
+    this thread's destructor has been called as the destructor closes the plugin 
+    which results in a call to the plugin's derived destructor contained in the DLL (!)
+    */ 
+    TInt r = iLib.Duplicate(iThread, EOwnerProcess);
+    __ASSERT_ALWAYS(r==KErrNone, Fault(EFsThreadConstructor));
 	}
 
 CPluginThread::~CPluginThread()
     {
     iPlugin.Close();
+	iLib.Close();
     }
 
 
-CPluginThread* CPluginThread::NewL(CFsPlugin& aPlugin)
+CPluginThread* CPluginThread::NewL(CFsPlugin& aPlugin, RLibrary aLibrary)
 	{
 	__PRINT(_L("CPluginThread::NewL()"));
-	CPluginThread* pT=new(ELeave) CPluginThread(aPlugin);
+	CPluginThread* pT=new(ELeave) CPluginThread(aPlugin, aLibrary);
 	TInt r=pT->Initialise();
 
 	/** @prototype */