United StatesChange Country, Oracle Worldwide Web Sites Communities I am a... I want to...
Bug ID: JDK-6199320 deadlock in locking of TimeZone class during a read
JDK-6199320 : deadlock in locking of TimeZone class during a read

Details
Type:
Bug
Submit Date:
2004-11-23
Status:
Closed
Updated Date:
2010-12-03
Project Name:
JDK
Resolved Date:
2005-01-07
Component:
core-libs
OS:
solaris_8,linux
Sub-Component:
java.util
CPU:
x86,generic
Priority:
P2
Resolution:
Fixed
Affected Versions:
1.4.2,5.0
Fixed Versions:

Related Reports
Backport:
Backport:
Backport:
Backport:
Duplicate:

Sub Tasks

Description
With the following test case
there is a deadlock.

This is present in both 1.5.0 and 1.4.2

import java.io.IOException;
import java.util.Properties;
import java.util.TimeZone;
public class DeadlockTest 
{
  public DeadlockTest()
  {
     Properties sysproperty = System.getProperties();
     Thread1 t1 = new Thread1(sysproperty);
     Thread2 t2 = new Thread2();
     t1.start();
     t2.start();
     
  }

  /**
   * 
   * @param args
   */
  public static void main(String[] args)
  {
    DeadlockTest deadlockTest = new DeadlockTest();
  }
  
  class Thread1 extends Thread
  {
    Properties sp;
    public Thread1(Properties p)
    {
      sp = p;
    }
    public void run()
    {
      try
      {
        sp.store(System.out, null);
      }catch (IOException e)
      {
        System.out.println("IOException : " + e);
      }
    }
  }
  
  class Thread2 extends Thread
  {
    public void run()
    {
      TimeZone.getTimeZone("PST");
    }
  }
}


^\Full thread dump Java HotSpot(TM) Server VM (1.4.2_06-b03 mixed mode):

"DestroyJavaVM" prio=5 tid=0x00036c48 nid=0x1 waiting on condition 
[0..ffbfef38]

"Thread-1" prio=5 tid=0x000f8148 nid=0xc waiting for monitor entry 
[f107e000..f107fc28]
        at java.util.Hashtable.get(Hashtable.java:332)
        - waiting to lock <0xf1800560> (a java.util.Properties)
        at java.util.Properties.getProperty(Properties.java:563)
        at java.lang.System.getProperty(System.java:575)
        at 
sun.security.action.GetPropertyAction.run(GetPropertyAction.java:66)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
sun.util.calendar.ZoneInfoFile.readZoneInfoFile(ZoneInfoFile.java:900)
        at 
sun.util.calendar.ZoneInfoFile.createZoneInfo(ZoneInfoFile.java:520)
        at sun.util.calendar.ZoneInfoFile.getZoneInfo(ZoneInfoFile.java:499)
        - locked <0xf5951af0> (a java.lang.Class)
        at sun.util.calendar.ZoneInfo.getTimeZone(ZoneInfo.java:524)
        at java.util.TimeZone.getTimeZone(TimeZone.java:448)
        at java.util.TimeZone.getTimeZone(TimeZone.java:444)
        - locked <0xf594d440> (a java.lang.Class)
        at DeadlockTest$Thread2.run(DeadlockTest.java:51)

"Thread-0" prio=5 tid=0x000f7730 nid=0xb waiting for monitor entry 
[f117f000..f117fc28]
        at java.util.TimeZone.getDefault(TimeZone.java:498)
        - waiting to lock <0xf594d440> (a java.lang.Class)
        at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:500)
        at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:443)
        at java.util.Date.toString(Date.java:981)
        at java.util.Properties.store(Properties.java:531)
        - locked <0xf1800560> (a java.util.Properties)
        at DeadlockTest$Thread1.run(DeadlockTest.java:39)

"Signal Dispatcher" daemon prio=10 tid=0x000eff10 nid=0x6 waiting on 
condition [0..0]

"Finalizer" daemon prio=8 tid=0x000ec880 nid=0x4 in Object.wait() 
[fbf7f000..fbf7fc28]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf1800490> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
        - locked <0xf1800490> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x000ec600 nid=0x3 in 
Object.wait() [fc67f000..fc67fc28]
        at java.lang.Object.wait(Native Method)
        - waiting on <0xf1800380> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:429)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:115)
        - locked <0xf1800380> (a java.lang.ref.Reference$Lock)

"VM Thread" prio=5 tid=0x000ec020 nid=0x2 runnable

"VM Periodic Task Thread" prio=10 tid=0x000f4698 nid=0xa waiting on 
condition
"Suspend Checker Thread" prio=10 tid=0x000ef610 nid=0x5 runnable

Found one Java-level deadlock:
=============================
"Thread-1":
  waiting to lock monitor 0x000ed100 (object 0xf1800560, a 
java.util.Properties),
  which is held by "Thread-0"
"Thread-0":
  waiting to lock monitor 0x000ed138 (object 0xf594d440, a java.lang.Class),
  which is held by "Thread-1"

Java stack information for the threads listed above:
===================================================
"Thread-1":
        at java.util.Hashtable.get(Hashtable.java:332)
        - waiting to lock <0xf1800560> (a java.util.Properties)
        at java.util.Properties.getProperty(Properties.java:563)
        at java.lang.System.getProperty(System.java:575)
        at 
sun.security.action.GetPropertyAction.run(GetPropertyAction.java:66)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
sun.util.calendar.ZoneInfoFile.readZoneInfoFile(ZoneInfoFile.java:900)
        at 
sun.util.calendar.ZoneInfoFile.createZoneInfo(ZoneInfoFile.java:520)
        at sun.util.calendar.ZoneInfoFile.getZoneInfo(ZoneInfoFile.java:499)
        - locked <0xf5951af0> (a java.lang.Class)
        at sun.util.calendar.ZoneInfo.getTimeZone(ZoneInfo.java:524)
        at java.util.TimeZone.getTimeZone(TimeZone.java:448)
        at java.util.TimeZone.getTimeZone(TimeZone.java:444)
        - locked <0xf594d440> (a java.lang.Class)
        at DeadlockTest$Thread2.run(DeadlockTest.java:51)
"Thread-0":
        at java.util.TimeZone.getDefault(TimeZone.java:498)
        - waiting to lock <0xf594d440> (a java.lang.Class)
        at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:500)
        at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:443)
        at java.util.Date.toString(Date.java:981)
        at java.util.Properties.store(Properties.java:531)
        - locked <0xf1800560> (a java.util.Properties)
        at DeadlockTest$Thread1.run(DeadlockTest.java:39)

Found 1 deadlock.
------------------------------

with SA

Deadlock Detection:

Found one Java-level deadlock:
=============================

"Thread-1":
 waiting to lock Monitor@0x000ed0d0 (Object@0x3d400560, a java/util/Properties),
 which is held by "Thread-0"
"Thread-0":
 waiting to lock Monitor@0x000ed108 (Object@0xd991c9b8, a java/lang/Class),
 which is held by "Thread-1"

Found a total of 1 deadlock.

Java Stack Trace for Thread-0
Thread state = BLOCKED

- public static synchronized java.util.TimeZone getDefault() @0xd991c1b0 @bci = 0, line = 498, pc = 0xf9c0a610 (Interpreted)
- private void initialize(java.util.Locale) @0xd990dcd0 @bci = 13, line = 500, pc = 0xf9c05758 (Interpreted)
- public void <init>(java.lang.String, java.util.Locale) @0xd990ec68 @bci = 28, line = 443, pc = 0xf9c0580c (Interpreted)
- public java.lang.String toString() @0xd9906828 @bci = 31, line = 981, pc = 0xf9c0580c (Interpreted)
- public synchronized void store(java.io.OutputStream, java.lang.String) @0xd982a120 @bci = 65, line = 531, pc = 0xf9c05758 (Interpreted)
- public void run() @0xd9901928 @bci = 8, line = 37, pc = 0xf9c0580c (Interpreted)

Thread Info: Thread-0
State: BLOCKED
Stack in use by Java: 0x3c1ff640 .. 0x3c1ffb38
Base of Stack: 0x3c1fffa0
Last_Java_SP: 0x3c1ff7d8
Last_Java_FP: null
Thread id: t@11
PostJavaState: 0x3c1ff76c


Java Stack Trace for Thread-1
Thread state = BLOCKED

- public synchronized java.lang.Object get(java.lang.Object) @0xd98291d0 @bci = 0, line = 332, pc = 0xf9c0a610 (Interpreted)
- public java.lang.String getProperty(java.lang.String) @0xd982a240 @bci = 2, line = 563, pc = 0xf9c05758 (Interpreted)
- public static java.lang.String getProperty(java.lang.String) @0xd9816498 @bci = 50, line = 575, pc = 0xf9c05758 (Interpreted)
- public java.lang.Object run() @0xd986c538 @bci = 4, line = 66, pc = 0xf9c05758 (Interpreted)
- public static native java.lang.Object doPrivileged(java.security.PrivilegedAction) @0xd984cef8 @bci = 0, pc = 0xf9c0b974 (Interpreted)
- private static byte[] readZoneInfoFile(java.lang.String) @0xd9920478 @bci = 11, line = 900, pc = 0xf9c05758 (Interpreted)
- private static sun.util.calendar.ZoneInfo createZoneInfo(java.lang.String) @0xd9920820 @bci = 4, line = 520, pc = 0xf9c05758 (Interpreted)
- public static synchronized sun.util.calendar.ZoneInfo getZoneInfo(java.lang.String) @0xd9920cd0 @bci = 9, line = 499, pc = 0xf9c05758 (Interpreted)
- public static java.util.TimeZone getTimeZone(java.lang.String) @0xd991e9b0 @bci = 3, line = 524, pc = 0xf9c05758 (Interpreted)
- private static java.util.TimeZone getTimeZone(java.lang.String, boolean) @0xd991c770 @bci = 1, line = 448, pc = 0xf9c05758 (Interpreted)
- public static synchronized java.util.TimeZone getTimeZone(java.lang.String) @0xd991c548 @bci = 2, line = 444, pc = 0xf9c05758 (Interpreted)
- public void run() @0xd9902270 @bci = 2, line = 49, pc = 0xf9c05758 (Interpreted)


Thread Info: Thread-1
State: BLOCKED
Stack in use by Java: 0x3c0fed50 .. 0x3c0ffb40
Base of Stack: 0x3c0fffa0
Last_Java_SP: 0x3c0feee8
Last_Java_FP: null
Thread id: t@12
PostJavaState: 0x3c0fee7c

                                    

Comments
EVALUATION

Need move the "new Date().toString()" out of the sync block.
###@###.### 2004-11-24 20:32:10 GMT
                                     
2004-11-23
WORK AROUND

The change is here.
 public DeadlockTest()
 {
    Properties sysproperty = System.getProperties();
    Properties properties = new Properties(sysproperty);
//     Thread1 t1 = new Thread1(sysproperty);
    Thread1 t1 = new Thread1(properties);
    Thread2 t2 = new Thread2();
    t1.start();
    t2.start();

 }

now this is ok for the test case, but we're not sure yet if
it is applicable for Oracle as a whole.

###@###.### 2004-11-23 15:16:29 GMT
                                     
2004-11-23



Hardware and Software, Engineered to Work Together