Memory leak in DriverManager.registerDriver()

I am finding that when a driver is registered with the java.sql.DriverManager multiple times it runs the JVM out of memory (crashing it). I tested using the last three versions of the JDBC (thin) drivers through 8.1.7, using both Sun JDK 1.2.2 and 1.3 (final) on Linux. It takes only a 1-2 minutes to use all the memory. The following code should be sufficient to reproduce the issue:
import java.sql.*;
public class ClassLd {
public static void main(String[] args) {
try {
while (1==1) {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
} catch (Exception e) {
System.out.println("Error");
e.printStackTrace();
This produces the following error:
Exception in thread "main" java.lang.OutOfMemoryError
<<no stack trace available>>
The documentation clearly states that "You register the driver only once in
your Java application." However, a memory leak is still a nasty bug -- even if that line of documentation was skimmed.
Thanks,
slag
[email protected]

If you are concerned about registering the same driver multiple times then you should use the DriverManager.deregisterDriver() API to clean up.
In your program the DriverManager has no choice but to hold on to all of the driver objects that you are creating and registering.

Similar Messages

Memory leak when exceptions are thrown?

Hello,
I'm doing a simple database connect with the JDBC Oracle 8.1.6 oci8 drivers on Solaris. It seems whenever I try to repeatedly connect to a database, and an exception is thrown, such as database not found, or wrong password, the program size grows and grows until it runs out of memory. I've narrowed it down to being the getConnection operation as the casue of this memory leak.
Now, if I repeatedly connect successfully, there is no problem, it will run all day, but if there are exceptions thrown, memory leaks. Has anyone else encountered this?
I'll paste a sample program below which shows the problem. Maybe someone can help???
import java.sql.*;
import java.util.*;
import java.io.*;
public class connect extends Thread {
private oracle.jdbc.driver.OracleDriver oDriver = new oracle.jdbc.driver.OracleDriver();
private Connection connection;
* Open a connection to the database
private void connectToDB() {
try {
connection = DriverManager.getConnection ("jdbc:oracle:oci8:@test", "test", "test");
connection.close();
} catch (SQLException e) {
e.printStackTrace();
System.out.println("couldn't connect");
public void run() {
try {
DriverManager.registerDriver(oDriver);
} catch (SQLException e) {}
while(true) {
try {
sleep(1000);
connectToDB();
} catch (InterruptedException ie) {}
public static void main(String[] args) {
connect conn = new connect();
conn.start();
null

Try this:
private void connectToDB() {
try {
connection = DriverManager.getConnection ("jdbc:oracle:oci8:@test", "test", "test");
} catch (SQLException e) {
e.printStackTrace();
System.out.println("couldn't connect");
finally {
connection.close();
null

Memory leak in Tomcat 5.5

Hi all, i am experiencing memory leaks while using tomcat 5.5 and mysql connector 3.1.7.. While running the attached code tomcat swallows up to 20 mb and doesnt return it. I close down everything but the app still leaks mem. For now it's not an issue (Tomcat stays below 60mb mem of 1gb), however running this app on serveral clients will dramatically increase the memory allocation.
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.awt.Image;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class Thumbs extends HttpServlet {
private String dbDriver = "com.mysql.jdbc.Driver";
private String dbURL = "jdbc:mysql://localhost/webapp?";
private String userID = "javauser";
private String passwd = "javadude";
private Connection dbConnection;
//Initialize global variables
public void init() throws ServletException {
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try{
       String maxDim = "";
       String siteString = request.getParameterValues("s")[0];
       if (request.getParameterValues("d") != null){
           maxDim = request.getParameterValues("d")[0];
       if (maxDim == ""){
           response.setContentType("image/jpeg");
           OutputStream out = response.getOutputStream();
           writePicture(out,siteString);
       else{
           if (siteString != null) {
               int maxDimension = Integer.parseInt(maxDim);
               response.setContentType("image/jpeg");
               OutputStream out = response.getOutputStream();
               writeThumbnailPicture(out, siteString, maxDimension);
    } catch (Exception ex){
        ex.printStackTrace();
        log(ex.getMessage());
public void writePicture(OutputStream out, String siteID){
      try{
          Class.forName(dbDriver);
          dbConnection = DriverManager.getConnection(dbURL, userID, passwd);
          PreparedStatement stmt = dbConnection.prepareStatement("select * from webcatalog where ID = ?");
          stmt.setString(1,siteID);
          stmt.executeQuery();
          ResultSet rs = stmt.getResultSet();
          if (rs.next()) {
              byte[] data = rs.getBytes("Picture");
              if (data != null) {
                  Image inImage = new ImageIcon(data).getImage();
                  BufferedImage outImage = new BufferedImage(inImage.getWidth(null),
                                                             inImage.getHeight(null),
                                                             BufferedImage.TYPE_INT_RGB);
                  // Paint image.
                  Graphics2D g2d = outImage.createGraphics();
                  g2d.drawImage(inImage,null,null);
                  // JPEG-encode the image
                  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
                  encoder.encode(outImage);
                  out.close();
          rs.close();
          stmt.close();
          dbConnection.close();
      }catch(Exception ex){
          ex.printStackTrace();
public void writeThumbnailPicture(OutputStream out,String siteID,int maxDimension){
    try{
      Class.forName(dbDriver);
      dbConnection = DriverManager.getConnection(dbURL, userID, passwd);
      PreparedStatement stmt = dbConnection.prepareStatement("select * from webcatalog where ID = ?");
      stmt.setString(1,siteID);
      stmt.executeQuery();
      ResultSet rs = stmt.getResultSet();
      if (rs.next()) {
        byte[] data = rs.getBytes("Picture");
        if (data != null) {
          Image inImage = new ImageIcon(data).getImage();
          // Determine the scale.
           double scale = (double)maxDimension / (double)inImage.getHeight(null);
           if (inImage.getWidth(null) > inImage.getHeight(null)) {
               scale = (double)maxDimension /(double)inImage.getWidth(null);
           // Determine size of new image.
           // One of them should equal maxDim.
           int scaledW = (int)(scale*inImage.getWidth(null));
           int scaledH = (int)(scale*inImage.getHeight(null));
           // Create an image buffer in
           //which to paint on.
           BufferedImage outImage = new BufferedImage(scaledW, scaledH,
               BufferedImage.TYPE_INT_RGB);
           // Set the scale.
           AffineTransform tx = new AffineTransform();
           // If the image is smaller than
           // the desired image size,
           // don't bother scaling.
           if (scale < 1.0d) {
               tx.scale(scale, scale);
           // Paint image.
           Graphics2D g2d = outImage.createGraphics();
           g2d.drawImage(inImage, tx, null);
           g2d.dispose();
           // JPEG-encode the image
           JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
           encoder.encode(outImage);
           out.close();
      rs.close();
      stmt.close();
      dbConnection.close();
    catch(Exception ex){
      ex.printStackTrace();
//Clean up resources
public void destroy() {
private void jbInit() throws Exception {
}

you can try this:
open your connection outside the function, and then pass it like as a parameter...
writePicture(OutputStream out, String siteID, Connection conn)
this can solve the problem because opening the connection inside the function spends a lot of memory...
Hope this can help you
Regards
Fernando

Memory leak in OCI while using AQ

There seems to be a serious memory leak in the OCI driver (9.2.0.1) when using a JAVA client to dequeue a database queue (Advanced Queuing).
Continuous dequeuing causes the heap memory to increase, and this memory never gets freed which leads me to suspect a memory leak in the OCI components (as the memory allocated for the JVM is constant). The heap memory increases by 3-4 MB after a dequeue of 1000 RAW messages,
Has anyone come across this problem before and if so are there any solutions? Changing to a thin driver is not a solution for me due to other requirements.
I'm using using Oracle client v9.2.0.1 libraries running on Solaris 8.
The source code for my JAVA test client is as below:
/* JAVA dequeue */
package com.ubsw.risk.pce.eventqueues.test;
import oracle.AQ.*;
import java.sql.*;
import oracle.jdbc.*;
public class testRawDequeue {
public testRawDequeue() {
public static void main(String[] args) {
Connection conn = null;
AQSession aq_sess = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
//Use OCI connection
conn = DriverManager.getConnection("jdbc:oracle:oci:@DB_NAME.world","user","password");
conn.setAutoCommit(false);
Class.forName("oracle.AQ.AQOracleDriver");
while(true) {
aq_sess = AQDriverManager.createAQSession(conn);
runTest(aq_sess);
aq_sess.close();
aq_sess = null;
System.gc();
} catch (Exception e) {
e.printStackTrace();
System.out.println(e.toString());
try {
if (aq_sess != null) {
aq_sess.close();
if (conn != null) {
conn.close();
} catch (SQLException sqle) {
public static void runTest(AQSession aq_sess) throws AQException, SQLException
AQQueueTable q_table;
AQQueue queue;
AQMessage message;
AQRawPayload raw_payload;
AQEnqueueOption enq_option;
String test_data = "new message";
AQDequeueOption deq_option;
byte[] b_array;
/* Get a handle to a queue - in aquser schema: */
queue = aq_sess.getQueue ("user", "raw_msg_queue");
System.out.println("Successful getQueue");
/* Creating a AQDequeueOption object with default options: */
deq_option = new AQDequeueOption();
/* Dequeue a message: */
message = queue.dequeue(deq_option);
System.out.println("Successful dequeue");
/* Retrieve raw data from the message: */
raw_payload = message.getRawPayload();
b_array = raw_payload.getBytes();
System.out.println("bytes:" + b_array.toString());
queue.close();
((AQOracleSession)aq_sess).getDBConnection().commit();

This sounds very similar to the memory leak I have in Oracle 9i using Pro*C++. Everytime a connect is made memory appears to leak and it only happens in multithreaded mode not default mode. There is a thread about this under the Oracle C++ call interface. Under 9i it appears to leak about 60K per connect rather than 60 bytes.
Paul

JDBCODBC memory leake

Ok, I've been pulling my hair out with this one all morning. The following code is causing a memory leak which eventually crashes tomcat. I'm hoping another set of eyes can find where the problem is. Right now I'm thinking it's inside the sun.jdbc.odbc package. Footprint increases by a few hundred bytes on every call and unfortunately it is called very often.
private static final String baseURL = "jdbc:odbc:name:uid=test;pwd=test";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver") ;
Connection conn = null;
Statement stmt = null;
try {
conn = DriverManager.getConnection(baseURL, prop);
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("Select col from testdb where uid="+uid);
if(rs.next()) {
col = rs.getInt(1));
rs.close();
} catch(Exception e) {
e.printStackTrace();
}finally {
try {
if(stmt != null) {
try {
stmt.close();
}catch(Exception weird) {
weird.printStackTrace();
if(conn != null) {
try {
try {
conn.clearWarnings();
} catch(Exception e) {
e.printStackTrace();
conn.close();
}catch(Exception weird) {
weird.printStackTrace();
}catch(Exception e) {
e.printStackTrace();
Any help greatly appreciated.
-Simon

Your code snippet:
try {
conn = DriverManager.getConnection(baseURL, prop);
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("Select col from testdb where uid="+uid);
if(rs.next()) {
    col = rs.getInt(1));
rs.close();
catch(Exception e) {
e.printStackTrace();
finally {
try {
    if(stmt != null) {
      try {
        stmt.close();
      catch(Exception weird) {
        weird.printStackTrace();
    if(conn != null) {
      try {
        try {
          conn.clearWarnings();
        catch(Exception e) {
          e.printStackTrace();
        conn.close();
      catch(Exception weird) {
        weird.printStackTrace();
catch(Exception e) {
    e.printStackTrace();
}Why not:
try {
conn = DriverManager.getConnection(baseURL, prop);
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("Select col from testdb where uid="+uid);
if(rs.next()) {
    col = rs.getInt(1));
catch(Exception e1) {
System.out.println("1) "+e1);
finally {
try {
    rs.close();
catch(Exception e2 {
    System.out.println("2) "+e2);
if(stmt != null) {
    try {
      stmt.close();
    catch(Exception e3) {
      System.out.println("3) "+e3);
if(conn != null) {
    try {
      conn.close();
    catch(Exception e4) {
      System.out.println("4) "+e4);
}Might help a bit. At any rate you do not need 'try {' around 'if' stmnts.

Dequeue memory leak ?

Hi
I have the following code to dequeue a message:
public static AqMsg2 deQueueMsg(Connection p_cn, String p_queueowner, String p_queuename) throws SQLException {
//Disable autocommit
p_cn.setAutoCommit(false);
//Get a reference to the queue
AqMsg2 v_AqMsg2 = null;
AQSession aqs = null;
AQQueue aqq = null;
AQMessage aqm = null;
AQDequeueOption dq_option = new AQDequeueOption();
dq_option.setDequeueMode(AQDequeueOption.DEQUEUE_REMOVE);
dq_option.setWaitTime(AQDequeueOption.WAIT_FOREVER);
AQDriverManager.registerDriver(new AQOracleDriver());
aqs = AQDriverManager.createAQSession(p_cn);
aqq = aqs.getQueue(p_queueowner, p_queuename );
//Retrieve the message from the queue
aqm = ((AQOracleQueue)aqq).dequeue(dq_option, AqMsg2.getFactory());
AQObjectPayload payload = aqm.getObjectPayload();
v_AqMsg2 = (AqMsg2) payload.getPayloadData();
//Return the payload-Object class
return v_AqMsg2;
The line
aqm = ((AQOracleQueue)aqq).dequeue(dq_option, AqMsg2.getFactory());
is somehow giving a memory leak. For each time the method is called the total memory used by the jvm is getting bigger, and the GC ain't freeing it.
I surpose that the dequeue method in AQOracleQueue is using a OracleCallableStatement and a resultset.
Is both of these closed when the methodcall is done ?
Is this a bug or is it something in my code ?
Ole
null

Hi all,
I am planning to use JAVA AQ API to dequeue the messages. I would like to know where exactly the memory leak occurs.
For example, I run my java class (In the java class will contain dequeue process using JAVA AQ API) in server A to make a JDBC connection call to server B to kick off the dequeuing process. The server B has an oracle database with version: 9.0.1.5. Does the memory leak occurs in Server A where I kick off the process or in server B where the queue is actually resides.
Is there specific version of 9i that the memory leak happens?
Thanks in advance for any advice.

Memory leak when transferring pdf...help needed

Dear All,
I'm a newbie in developing java app. I'm making a web based application in reporting using JSP. java 1.6.02, jasper report 204, i-report 2.0.0
Client : OS : Win xp, memory 512MB
Server : Tomcat 6.0
DB Server : SQL Server 2005
OS Server : Windows Server 2003, memory 1GB
Report spec : .pdf based, with up to 1million record
Here's the code :
String query;
        try {
        String filereport = request.getRealPath("division/accounting/template/POReport.jrxml");
        InputStream input = new FileInputStream(filereport);
        Class.forName(odbcDriver);
        Connection conn = DriverManager.getConnection(odbcURL,username,passwd);
        ResultSet rset = null;
        CallableStatement cs = null;
        query = "{ call sp_tpo_list }";
          cs = conn.prepareCall(query);
          rset = cs.executeQuery();
        JRDataSource dataSource = new JRResultSetDataSource(rset);
        JasperDesign design = JRXmlLoader.load(input);
        JasperReport report = JasperCompileManager.compileReport(design);
        JasperPrint print = JasperFillManager.fillReport(report, null, dataSource);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        JasperExportManager.exportReportToPdfStream(print, baos);
        response.setContentType("application/pdf");
        response.setContentLength(baos.size());
        ServletOutputStream sos;
        sos = response.getOutputStream();
        baos.writeTo(sos);
        sos.flush();
        rset.close();
        cs.close();
        conn.close();
        sos.close();
        baos.close();
        input.close();
        catch (FileNotFoundException fe) {}
        catch (JRException jre) {}
        catch (ClassNotFoundException cnfe) {}
        catch (SQLException sqle) {}
        catch (IOException ioe) {}I've already increase heap memory in Tomcat Manager -Xms 64Mb -Xmx 512Mb.
But when i test with 1million record, out of heap memory error is coming out.
When i test with 500.000 record, it work out, but only when 1 client access. More than 1 client, out of heap memory error generated by the system.
How can this happen? How can i detect memory leaks occured in the program?
And pls let me know if you see something is missing in the code above.
Thank you

I dont think you have a memory leak. I think the problem is the xml file is 1000000 records long and takes up too much memory. Even if you find a way to increase memory size, you are loading down the server too much for other people's applications to run. I suggest instead reading up on xml and learning how to read in only a few records at a time, processing it, and getting the next set of records to process. There are two methods to parse an xml file using an xml parser, one is to parse it all and put it in memory, the other is to process one record at a time (an xml book explains it better).
However, I question why you have reports that are 1000000 records long. end-users cannot effectively use such records (you cant scroll through 1000000 records). I suggest finding a way to greatly decrease the number of records in each file such as by providing just the records a particular user needs to do his job and not all records. For instance, put a textfield on his screen to let him only fetch records within a certain date range.
Lastly, I suggest putting your code in a try/catch/finally block where the finally block actually closes the objects. Example:
finally{
if(conn!=null)
conn.close();
}

How to determine memory leaks?

I tried in XCODE, the RUN/ Start with Performance TOol / and tried out the various options. I was running my app and looking to see if it would report increasing memory use but it seemed to be looking at my total system (i was running under the simulator). In general what is the recommended procedure for determining memory leaks, which tool to use, and what tracing can i use?
How does one look at the retain count of an object? are there system routines that have knonw leaks?

You took the right path. Once instruments comes up select the Leaks tool. Turn off automatic leak detection. In your app, start off at some known state, do something, and come back to the known state and check for leaks. For instance start off in a view, do something that brings up another view then come back to the original view and check for leaks. Leaks will show you if you leaked. Since you took a very deterministic path then checked it should be straight forward to go to the code and find / fix the leaks. Leaks shows you where the code where the leak was generated.

Memory leak in JSpinner implementation (maybe others?)

Hi,
I am developing an application using Java and Swing, and have run into some problems with memory leaks. After examining the source code and making an example program (provided below), I can only come to the conclusion that there is a bug in the implementation of JSpinner in Sun Java 1.6.0_03.
If one uses a custom model with the JSpinner, it attaches itself as a listener to the model. However, it never removes the listening connection, even if the model is changed. This causes the JSpinner to be kept in memory as long as the model exists, even if all other references to the component have been removed.
An example program is available at http://eddie.dy.fi/~sampo/ModelTest.java . It is a simple swing program that has the JSpinner and two buttons, the first of which writes to stdout the listeners of the original model and the second changes the spinner model to a newly-created model. A sample output is below:
Running on 1.6.0_03 from Sun Microsystems Inc.
Listeners before connecting to JSpinner:
Model value is 0, 0 listeners connected:
Listeners after connecting to JSpinner:
Model value is 0, 2 listeners connected:
1: interface javax.swing.event.ChangeListener
2: javax.swing.JSpinner$ModelListener@9971ad
Listeners now:
Model value is 8, 2 listeners connected:
1: interface javax.swing.event.ChangeListener
2: javax.swing.JSpinner$ModelListener@9971ad
Changing spinner model.
Listeners now:
Model value is 8, 2 listeners connected:
1: interface javax.swing.event.ChangeListener
2: javax.swing.JSpinner$ModelListener@9971adThis shows that even though the model of the JSpinner has been changed, it still listens to the original model. I haven't looked at other components whether they retain connections to the old models as well.
In my case, I have an adaptor-model which provides a SpinnerModel interface to the actual data. The adaptor is implemented so that it listens to the underlying model only when it itself is being listened to. If the JComponents using the model were to remove the listening connections, it, too, would be automatically garbage-collected. However, since JSpinner does not remove the connections, the adaptor also continues to listen to the underlying model, and neither can be garbage-collected.
All in all, the listener-connections seem to be a very easy place to make memory leaks in Java and especially in Swing. However, as I see it, it would be a simple matter to make everything work automatically with one simple rule: Listen to the models only when necessary.
If a component is hidden (or alternatively has no contact to a parent JFrame or equivalent), it does not need to listen to the model and should remove the connections. When the component is again set visible (or connected to a frame) it can re-add the connections and re-read the current model values just as it does when initializing the component. Similarly, any adaptor-models should listen to the underlying model only when it itself is being listened to.
If the components were implemented in this way, one could simply remove a component from the frame and throw it away, and automatically any listener-connections will be removed and it can be garbage-collected. Similarly any adaptor-models are collected when they are no longer in use.
Changing the API implementation in this way would not require any changes to applications, as the only thing that changes are the listener-connections. Currently used separate connection-removing methods should still work, though they would be unnecessary any more. The API would look exactly the same from the view of an application programmer, only that she would not need to care about remnant listening connections. (As far as I can tell, the current API specification would allow the API to be implemented as described above, but it should of course require it to be implemented in such a way.)
Am I missing something, or is there some valid reason why the API is not implemented like this?
PS. I'm new to these forums, so if there is a better place to post these reports, please tell me. Thanks.

Another cognition: It's the following code, that causes the memory to be accumulated:
obj = m_orb.resolve_initial_references("NameService");
ctx = NamingContextExtHelper.narrow(obj);For the first 4 calls to this code the memory usage of the nameservice is unchanged. From the 5th to the 8th call, it's increased by approx. 10KB per call. And thenceforward (beginning with the 9th call) it's increasing by approx. 10MB.
What's going wrong here?

Memory Leaks   Unresponsive Mouse

2009 8 core Mac Pro w/ 24 GB of RAM, ATI Radeon 4870, and a SeriTek PCIe eSATA card (card only has drives connected when running a manual drive clone). When running Toast 10 or Parallels 9, my RAM will fill up (I use a program called Menu Meters to monitor stuff). This machine worked just fine under OS 10.9 and earlier - no issues like this at all. ClamXAV will also completely fill the RAM up (the meter will be full green, instead of part green, then mostly grey when Toast or Parallels fills it up). I have to use Terminal to purge it so that the machine is usable.
The other thing that happens is that sometimes when the computer wakes up or I am in the middle of doing something, the mouse will still move, but the dock will not pop open and the left button the mouse doesn't respond. The right button will open the right click menu, but will not respond normally at all. I have tried a different Magic Mouse, but the problem is the same.
I thought that it may be a problem with the factory RAM and the Kingston RAM not playing nicely together. So I ran it with just the factory 8 GB and then ran it with the Kingston 16 GB - the problem persists no matter which RAM is installed. All of the RAM also passes the memory tests in Rember and TechTool.
So, I need to find out if someone thinks that maybe the bluetooth module may be going bad causing the mouse issues. I also need to find out what is causing the memory leaks. I followed the steps that someone gave on this site to boot into safe mode, repair permissions, reset PRAM, then reset SMC (or the other way around - I did it like they said to). It did nothing to fix the problem.
I need some guidance here. As I stated early on, the machine worked perfectly with OS 10.9. I have WAY too much software that I use, so doing a completely fresh install is out of the question - I don't have time to reload everything. This problem is annoying and I know that I am not the only one having these issues. Any input will be greatly appreciated. Thanks in advance.

Here is the EtreCheck report:
Problem description:
Memory leaks when using Toast 10 or Parallels 9. Mouse also become unresponsive (it will move, but left button does not work and dock will not pop open - mouse problem happens independent of the RAM being filled up - different mouse was tried with same result).
EtreCheck version: 2.1.5 (108)
Report generated January 9, 2015 at 9:20:59 PM MST
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
    Mac Pro (Early 2009) (Verified)
    Mac Pro - model: MacPro4,1
    2 2.26 GHz Quad-Core Intel Xeon CPU: 8-core
    24 GB RAM Upgradeable
        DIMM 1
            4 GB DDR3 ECC 1066 MHz ok
        DIMM 2
            4 GB DDR3 ECC 1066 MHz ok
        DIMM 3
            2 GB DDR3 ECC 1066 MHz ok
        DIMM 4
            2 GB DDR3 ECC 1066 MHz ok
        DIMM 5
            4 GB DDR3 ECC 1066 MHz ok
        DIMM 6
            4 GB DDR3 ECC 1066 MHz ok
        DIMM 7
            2 GB DDR3 ECC 1066 MHz ok
        DIMM 8
            2 GB DDR3 ECC 1066 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en2: 802.11 a/b/g/n
Video Information: ℹ️
    ATI Radeon HD 4870 - VRAM: 512 MB
        AL2216W 1680 x 1050 @ 60 Hz
System Software: ℹ️
    OS X 10.10.1 (14B25) - Uptime: 2:4:35
Disk Information: ℹ️
    HL-DT-ST BD-RE WH12LS39
    HL-DT-ST DVDRAM GH24NS90
    SAMSUNG HD103SJ disk1 : (1 TB)
        EFI (disk1s1) <not mounted> : 210 MB
        OS 10.10.1 (disk1s2) / : 999.35 GB (410.30 GB free)
        Recovery HD (disk1s3) <not mounted> [Recovery]: 650 MB
    SAMSUNG HD103SJ disk2 : (1 TB)
        EFI (disk2s1) <not mounted> : 210 MB
        Extra Storage (disk2s2) /Volumes/Extra Storage : 999.86 GB (554.20 GB free)
    SAMSUNG HD103SJ disk3 : (1 TB)
        EFI (disk3s1) <not mounted> : 210 MB
        Extra Storage 2 - Scratch (disk3s2) /Volumes/Extra Storage 2 - Scratch : 999.86 GB (39.54 GB free)
    WDC WD5001AALS-00LWTA0 disk0 : (500.11 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        BOOTCAMP (disk0s2) /Volumes/BOOTCAMP : 499.90 GB (275.71 GB free)
USB Information: ℹ️
    Shuttle Technology Inc. E-USB Bridge
    Sony C6606
    Apple, Inc. Keyboard Hub
        Apple Inc. Apple Keyboard
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
Firewire Information: ℹ️
    Apple Computer, Inc. iSight 200mbit - 400mbit max
Gatekeeper: ℹ️
    Anywhere
Kernel Extensions: ℹ️
        /Applications/Hotspot Shield.app
    [not loaded]    com.anchorfree.tun (1.0) [Support]
        /Applications/Parallels Desktop.app
    [not loaded]    com.parallels.kext.hidhook (9.0 24251.1052177) [Support]
    [not loaded]    com.parallels.kext.hypervisor (9.0 24251.1052177) [Support]
    [not loaded]    com.parallels.kext.netbridge (9.0 24251.1052177) [Support]
    [not loaded]    com.parallels.kext.usbconnect (9.0 24251.1052177) [Support]
    [not loaded]    com.parallels.kext.vnic (9.0 24251.1052177) [Support]
        /Applications/TechTool Deluxe.app
    [not loaded]    com.micromat.iokit.ttpatadriver (5.0.0) [Support]
    [not loaded]    com.micromat.iokit.ttpfwdriver (5.0.0) [Support]
        /Applications/TechTool Protogo/Protogo Applications/TechTool Pro 7.app
    [not loaded]    com.micromat.driver.spdKernel (1 - SDK 10.8) [Support]
    [not loaded]    com.micromat.driver.spdKernel-10-8 (1 - SDK 10.8) [Support]
        /Applications/Temperature Monitor 4.94/Temperature Monitor 4.94.app
    [not loaded]    com.bresink.driver.BRESINKx86Monitoring (8.0) [Support]
        /Applications/Toast 11 Titanium/Spin Doctor.app
    [not loaded]    com.hzsystems.terminus.driver (4) [Support]
        /Applications/Toast 7 Titanium/Toast Titanium.app
    [not loaded]    com.roxio.TDIXController (1.6) [Support]
        /Library/Extensions
    [loaded]    at.obdev.nke.LittleSnitch (4216 - SDK 10.8) [Support]
        /System/Library/Extensions
    [loaded]    com.SiliconImage.driver.Si3132 (1.2.5) [Support]
    [not loaded]    com.devguru.driver.SamsungComposite (1.2.63 - SDK 10.6) [Support]
    [not loaded]    com.microsoft.driver.MicrosoftMouse (8.2) [Support]
    [not loaded]    com.roxio.BluRaySupport (1.1.6) [Support]
        /System/Library/Extensions/MicrosoftMouse.kext/Contents/PlugIns
    [not loaded]    com.microsoft.driver.MicrosoftMouseBluetooth (8.2) [Support]
    [not loaded]    com.microsoft.driver.MicrosoftMouseUSB (8.2) [Support]
        /System/Library/Extensions/ssuddrv.kext/Contents/PlugIns
    [not loaded]    com.devguru.driver.SamsungACMControl (1.2.63 - SDK 10.6) [Support]
    [not loaded]    com.devguru.driver.SamsungACMData (1.2.63 - SDK 10.6) [Support]
    [not loaded]    com.devguru.driver.SamsungMTP (1.2.63 - SDK 10.5) [Support]
    [not loaded]    com.devguru.driver.SamsungSerial (1.2.63 - SDK 10.6) [Support]
Startup Items: ℹ️
    HP IO: Path: /Library/StartupItems/HP IO
    SiCoreService: Path: /Library/StartupItems/SiCoreService
    Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
    [running]    at.obdev.LittleSnitchUIAgent.plist [Support]
    [loaded]    com.coupons.coupond.plist [Support]
    [running]    com.micromat.TechToolProAgent.plist [Support]
    [loaded]    com.oracle.java.Java-Updater.plist [Support]
    [invalid?]    com.parallels.mobile.prl_deskctl_agent.launchagent.plist [Support]
    [invalid?]    com.parallels.mobile.startgui.launchagent.plist [Support]
    [not loaded]    com.teamviewer.teamviewer.plist [Support]
    [not loaded]    com.teamviewer.teamviewer_desktop.plist [Support]
Launch Daemons: ℹ️
    [running]    at.obdev.littlesnitchd.plist [Support]
    [loaded]    com.adobe.fpsaud.plist [Support]
    [loaded]    com.bombich.ccc.plist [Support]
    [loaded]    com.hp.lightscribe.plist [Support]
    [running]    com.micromat.TechToolProDaemon.plist [Support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Support]
    [loaded]    com.oracle.java.Helper-Tool.plist [Support]
    [invalid?]    com.parallels.mobile.dispatcher.launchdaemon.plist [Support]
    [failed]    com.parallels.mobile.kextloader.launchdaemon.plist [Support] [Details]
    [not loaded]    com.teamviewer.teamviewer_service.plist [Support]
User Launch Agents: ℹ️
    [loaded]    com.facebook.videochat.[redacted].plist [Support]
    [loaded]    com.google.keystone.agent.plist [Support]
    [running]    com.nchsoftware.expressinvoice.agent.plist [Support]
    [loaded]    uk.co.markallan.clamxav.clamscan.plist [Support]
    [loaded]    uk.co.markallan.clamxav.freshclam.plist [Support]
User Login Items: ℹ️
    iTunesHelper    Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    SMARTReporter    Application (/Applications/SMARTReporter/SMARTReporter.app)
    BetterSnapTool    Application (/Applications/BetterSnapTool.app)
    smcFanControl    Application (/Applications/smcfancontrol_2_2_2/smcFanControl.app)
    Android File Transfer Agent    Application (/Users/[redacted]/Library/Application Support/Google/Android File Transfer/Android File Transfer Agent.app)
Internet Plug-ins: ℹ️
    JavaAppletPlugin: Version: Java 8 Update 25 Check version
    FlashPlayer-10.6: Version: 16.0.0.235 - SDK 10.6 [Support]
    Default Browser: Version: 600 - SDK 10.10
    AdobePDFViewerNPAPI: Version: 11.0.06 - SDK 10.6 [Support]
    CouponPrinter-FireFox_v2: Version: 5.0.3 - SDK 10.6 [Support]
    AdobePDFViewer: Version: 11.0.06 - SDK 10.6 [Support]
    Flash Player: Version: 16.0.0.235 - SDK 10.6 [Support]
    QuickTime Plugin: Version: 7.7.3
    SharePointBrowserPlugin: Version: 14.4.6 - SDK 10.6 [Support]
    iPhotoPhotocast: Version: 7.0 - SDK 10.8
Safari Extensions: ℹ️
    AdBlock [Installed]
    F.B. Purity - Cleans Up Facebook [Installed]
    OpenIE [Installed]
3rd Party Preference Panes: ℹ️
    Déjà Vu [Support]
    Flash Player [Support]
    FUSE for OS X (OSXFUSE) [Support]
    Java [Support]
    MacFUSE [Support]
    MenuMeters [Support]
    Microsoft Mouse [Support]
    MouseLocator [Support]
    NTFS-3G [Support]
    TechTool Protection [Support]
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
        48%    plugin-container
        39%    fontd
         6%    firefox
         5%    WindowServer
         4%    bluetoothaudiod
Top Processes by Memory: ℹ️
    928 MB    firefox
    412 MB    plugin-container
    258 MB    mds_stores
    180 MB    iTunes
    129 MB    Finder
Virtual Memory Information: ℹ️
    19.38 GB    Free RAM
    3.11 GB    Active RAM
    1.88 GB    Inactive RAM
    1.38 GB    Wired RAM
    2.40 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Jan 9, 2015, 07:16:57 PM    Self test - passed
    Jan 8, 2015, 11:37:48 AM    /Library/Logs/DiagnosticReports/ClamXav_2015-01-08-113748_[redacted].cpu_resour ce.diag [Details]
    Jan 8, 2015, 11:21:46 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/Preview_2015-01-08-112146_[red acted].crash

T61 with memory leak on XP for driver battc.sys

Hi
I have an issue with XP where the battc.sys module that is part of Windows XP and responsible for the kernel side of monitoring the battery status. This module continually leaks memory until I have no more kernel paged resources left and programs start to fail on my laptop.
I raised a support case for this with Microsoft and after some investigation and upgrading to the latest T61 power drivers that were released a few days ago on the Lenovo site, MS support told me it is a fault of the T61 and that I would need to disable Microsoft APCI support to stop this memory leak from occuring and to take the issue up with Lenovo.
I have used the verifier tool to confirm that it is the Windows XP SP3 battc.sys memory module leaking.
I am running the latest T61 drivers and fully patch with MS drivers on SP3.
As MS have told me it is the fault of the T61 I am posting this issue here.
Thanks
Stephen

It is memory available to the kernelwhich itself does not show under a process in task manager as far as I am aware (unles it is taken account as part of the system process).
The best way to measure the available kernel memory space available is by using sysinternals procexp.
You need to download procexp and also install the windows debugging tools from Microsoft. Then in procexp set the "Options > Configure Symbols : Debughlp.dll path" to the new debughlp.dll installed with your debu tools and set the symbols path to srv*c:\Symbols*http://msdl.microsoft.com/download/symbols
Then you can choose in procexp "View > System Information" and see the used and total paged and non-paged kernel memory space.
poolmon helps monitor all the symbols that are taking up this memory and verifier lets you drill down to the exact module and the changes in memory for a module that is occuring.
Here are two really good links on it
http://blogs.msdn.com/ntdebugging/archive/2006/12/18/Understanding-Pool-Consumption-and-Event-ID_3A0...
http://blogs.msdn.com/ntdebugging/archive/2008/05/08/tracking-down-mmst-paged-pool-usage.aspx
In my poolmon i notice that Mmst and battc are taking alot of memory after my computer has been running for some time. Mmst being high is normal but battc should not continually be growing as it is which is why I raised the case to MS but they want verification it is not a Lenovo issue.

How do I report a major memory leak problem with Firefox 3.6.10 in WinXP?

After I installed Firefox 3.6.9 on a WinXP desktop, I occasionally had minor memory leak problems, reflected by getting "out of virtual memory" messages. I upgraded to 3.6.10 when notified that it was available and that it supposedly fixed stability problems. Ever since then, whenever I use Firefox, it starts out quick as a flash, but very rapidly slows down to a crawl, and has twice brought my system to a halt. IE does not cause this, nor any other program I use, but the execution speed of all programs slows as badly as Firefox. If I knew where to get older versions, I would back up to 3.6.9 or earlier. The situation now prevents me from using Firefox much at all.

Im running windows 7, Firefox 3.6.10 and before i updated to 3.6.10 my CPU never went above 10% with Firefox open. Now it can spike well above 50% and i have nothing different from when i had 3.6.9 to now when i have 3.6.10.
There is no evidence for me to suggest one of the additions i have is causing it, its all pointing to Firefox itself and the last update.

How can I address a memory leak problem with Firefox?

I have happily used Firefox for the past 7 years, and have rarely had difficulties. However, I am having some trouble now; Firefox (running 3.6.6) seems to have a memory leak on my machine. It's slower than what was discussed in other forum posts, but it still scales up slowly to multiple hundred MBs of Memory with very little CPU usage.
I have tried disabling add-ons and extensions, but this does not stop the problem. I have cleared my cache and other stored data, but that also does not help. Has anyone experienced a similar problem that might be able to help?
== This happened ==
Every time Firefox opened
== within last two weeks

Hi reble0708,
I have Java console disabled on my Firefox browser.Everything is working fine for me. There maybe other problem on your browser which is making PDF document faded and blurry. Can you post the link where you found the problem viewing the PDF document?
Btw, you can go to ftp://ftp.mozilla.org/pub/firefox/releases/ and select the previous version of Firefox from the given options. There's no need to uninstall Firefox before you downgrade to the previous version of it.But before new installation, backup your Firefox profile folder.
edit: replaced random unofficial download site link.

I am getting a memory leak that sometimes leads to an unresponsive Firefox, but does not crash per se.

Hello, For the last couple of months, I am having issues with one of my tabs or the program itself causing a memory leak. I was hoping that subsequent releases would fix the problem, but when I downloaded V.11 it did not help.
I use tab mix plus and at any time, usually have about 25 tabs open. Everything functioned okay for 8 or so months up until recently.
I am wondering if there is a way to try to track down what is causing the leak. If it is one of my open pages, i will get rid of it. I tried opening one page at a time from scratch, but could not find the issue. .
I always have flash block enabled to cut down on the website junk.
using OSX firefox v11.

Now, I'm not going to say it's an Add-On problem because from the research I've been doing on this problem for the last half hour shows that everyone has DIFFERENT add-ons, but everyone's having the SAME problem....
So I went through my add-ons and disabled them one by one, and the single add-on that has been giving me grief is the latest WOT add-on. So, I have Firefox 11 (so does my wife) and we both have the WOT add-on. But that's where the similarity ends... I have Windows 7 x64, she has Windows XP x86.... but she doesn't have the memory leak problem.
What I see is a sawtooth pattern over time. Memory goes up a little over 30+ seconds, then drops down. But over half an hour, the peaks of the sawtooth are larger, and it doesn't drop back down to the same level again - always a little more than before. And before you know it, FF is peaking at 1.5+GB, dropping down to 1.2GB... and FF is running very, very slowly.... excessive disk accesses (paging probably, though I apparently I still have 1.5 to 2.0 GB of free RAM). Killing FF frees it all up, and if I open FF again, it's back to using 250MB of RAM.
So, it's not the add-ons per se, but how they're interacting with FF (or the other way round).... most likely, it's this plug-in container they created to stop add-ons from taking FF with them when they crashed. Seems to have created more problems than it has solved..... would be great if you could choose not to use it....

Allocated memory pool was not deleted! 1 GB memory leak is too much for me!

Dear Sirs. I found that DB environment, that was configured to use 1 GB cache size, won't free it when closed! Why? First I tried to open and close environment and got the following:
Detected memory leaks!
Dumping objects ->
{596} normal block at 0x01970040, 1048596 bytes long.
Data: < > 14 00 10 00 DB DB DB DB 0B 00 10 00 01 00 00 00
{578} normal block at 0x00397978, 464 bytes long.
Data: < > D0 01 00 00 DB DB DB DB C7 01 00 00 01 00 00 00
Object dump complete.
I have and idea that BDB will reuse the memory, rite? OK, let's try to create the same environment and open it. After environment was opened, closed, opened again and again closed, I got the following:
Detected memory leaks!
Dumping objects ->
{3663} normal block at 0x01B80040, 1048596 bytes long.
Data: < > 14 00 10 00 DB DB DB DB 0B 00 10 00 01 00 00 00
{3645} normal block at 0x00396E60, 464 bytes long.
Data: < > D0 01 00 00 DB DB DB DB C7 01 00 00 01 00 00 00
{596} normal block at 0x01970040, 1048596 bytes long.
Data: < > 14 00 10 00 DB DB DB DB 0B 00 10 00 01 00 00 00
{578} normal block at 0x00397978, 464 bytes long.
Data: < > D0 01 00 00 DB DB DB DB C7 01 00 00 01 00 00 00
Object dump complete.
So memory was not reused, nor deallocated.
By the way, you may be interested in other leak I found, but fixed, see
Replication manager memory leak when setting local site information.
This leak is more serious, I am not sure I will fix it quickly. Maybe I'm doing something wrong? Could you please suggest something?
Thanks in advance!
With regards,
Vladislav.

OK, the problem solved by fixing code in file 'log.c', method '__log_dbenv_refresh'.
Just added the code that deallocates memory of bulk buffer.
if (IS_ENV_REPLICATED(dbenv))
if (lp->bulk_buf != INVALID_ROFF)
__db_shalloc_free(&dblp->reginfo, lp->bulk_buf);
lp->bulk_buf = INVALID_ROFF;
lp->bulk_len = 0;
lp->bulk_off = 0;
It was allocated in the '__log_open' function, by the following code:
          lp->ready_lsn = lp->lsn;
          if (IS_ENV_REPLICATED(dbenv)) {
               if ((ret = __db_shalloc(&dblp->reginfo, MEGABYTE, 0,
               &bulk)) != 0)
                    goto err;
               lp->bulk_buf = R_OFFSET(&dblp->reginfo, bulk);
               lp->bulk_len = MEGABYTE;
               lp->bulk_off = 0;
          } else {
               lp->bulk_buf = INVALID_ROFF;
               lp->bulk_len = 0;
               lp->bulk_off = 0;
Sorry for time taken to read my posts, I was really needy in quick help, but solved problems myself.

Memory leak in DriverManager.registerDriver()

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