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Date: Sun, 17 Jun 2007 23:50:27 -0700 (PDT)
From: "Pavel Rebriy (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Commented: (HARMONY-4024) [drlvm][thread] VM crashes when a
 lot of threads invoke  setUncaughtExceptionHandler or
 setDefaultUncaughtExceptionHandler methods
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    [ https://issues.apache.org/jira/browse/HARMONY-4024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12505703 ] 

Pavel Rebriy commented on HARMONY-4024:
---------------------------------------

There is no common parts with HARMONY-2742. The issue fixes thread_id reuse, HARMONY-2742 fixes fat monitors reuse. There is no reason to compare the JIRAs. Regarding fix way - yes, it's common for monitors and thread_ids. It's nothing at all serious.

Regarding memory leak it need to make more investigation on it.

> [drlvm][thread] VM crashes when a lot of threads invoke  setUncaughtExceptionHandler or setDefaultUncaughtExceptionHandler methods
> ----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-4024
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4024
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Windows
>            Reporter: Vera Petrashkova
>            Assignee: weldon washburn
>            Priority: Minor
>         Attachments: 0001-Fix-of-Thread-ID-bug.patch
>
>
> The following test demonstrates that VM crashes when a lot of created threads use setUncaughtExceptionHandler 
> or setDefaultUncaughtExceptionHandler methods
> --------------a1.java-------------------
> public class a1  extends Thread { 
>    public static int N_TH = 20; 
>    public static void main (String[] argv) { 
>         boolean def = true;
>         if (argv.length > 0) {
>             def = "true".equals(argv[0]);
>         }
>         try { 
>             if (argv.length > 1) { 
>                 N_TH=Integer.parseInt(argv[1]); 
>             } 
>         } catch (Throwable e) { 
>         } 
>         a1_UncoughtExcHnd h = new a1_UncoughtExcHnd();
>         for (int i = 0; i < 100000; i++) {
>             test(def, h);
>             if (i % 1000 == 0) {
>                 System.err.println("Step: " + i + "  finished");
>             }
>         }
>         System.out.println("Test passed"); 
>     }
>     public static void test(boolean defUncaught, a1_UncoughtExcHnd hnd) {                      
>         a1 t[] = new a1[N_TH]; 
>         for (int i = 0; i < N_TH; i++) { 
>             t[i]=new a1();
>             if (defUncaught) {
>                 t[i].setDefaultUncaughtExceptionHandler(hnd);
>             } else {
>                 t[i].setUncaughtExceptionHandler(hnd);
>             }
>             t[i].start(); 
>         } 
>         try { 
>             for (int i = 0; i < N_TH; i++) { 
>                 t[i].join(); 
>             } 
>         } catch (Throwable e) { 
>             System.err.println(e); 
>         } 
>     } 
>     public void m(int t) { 
>        int t1 = 100/t;
>     } 
>     public void run() { 
>         m(0); 
>     } 
> } 
> class a1_UncoughtExcHnd implements Thread.UncaughtExceptionHandler {
> public static int count = 0;
>     public void uncaughtException(Thread t, Throwable e) {
>         count++;
>         throw new RuntimeException(e);
>     }
> }
> --------------------------------
> Run test with DefaultUncaughtExceptionHandler
> java -cp . a1 true 20
> and  with UncaughtExceptionHandler
> java -cp . a1 false 20
> This test passes on RI in both cases:
> Output:
> =======
> On RI this test passes:
> java version "1.5.0_06"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
> Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode)
> Step: 0  finished
> ...
> Step: 94000  finished
> Step: 95000  finished
> Step: 96000  finished
> Step: 97000  finished
> Step: 98000  finished
> Step: 99000  finished
> Test passed
> DRLVM crashes on this test in both cases.
> Output:
> ======
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its l
> icensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r542118, (May 28 2007), Windows/ia32/msvc 1310, release build
> http://incubator.apache.org/harmony
> Step: 0  finished
> The GC did not provide gc_add_weak_root_set_entry()
> Step: 1000  finished
> Windows reported exception: 0xc0000005
> Registers:
>     EAX: 0x00000000, EBX: 0x41c14bf8, ECX: 0x0e810048, EDX: 0x003927a4
>     ESI: 0x00000000, EDI: 0x0babfe80, ESP: 0x0babfda0, EBP: 0x0babfddc
>     EIP: 0x10002a1e
> Stack trace:
>   0: hythread_monitor_notify_all (??:-1)
>   1: java/lang/VMThreadManager.notifyAll(Ljava/lang/Object;)I (VMThreadManager.java:-2)
>   2: java/lang/Object.notifyAll()V (Object.java:65)
>   3: java/lang/Thread.runImpl()V (Thread.java:667)
> <end of stack trace>
> DRLVM crashes even if only 1 thread is created on the each step.
> java -cp . a1 true 1
> Output
> ===========
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its licensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r542118, (May 28 2007), Windows/ia32/msvc 1310, release build
> http://incubator.apache.org/harmony
> Step: 0  finished
> The GC did not provide gc_add_weak_root_set_entry()
> Step: 1000  finished
> Step: 2000  finished
> Step: 3000  finished
> ....
> Step: 29000  finished
> Step: 30000  finished
> Step: 31000  finished
> Step: 32000  finished
> Step: 33000  finished
> Windows reported exception: 0xc0000005
> Registers:
>     EAX: 0x00000000, EBX: 0x41c17188, ECX: 0x0e810048, EDX: 0x003927a4
>     ESI: 0x00000000, EDI: 0x041ffe80, ESP: 0x041ffda0, EBP: 0x041ffddc
>     EIP: 0x10002a1e
> Stack trace:
>   0: hythread_monitor_notify_all (??:-1)
>   1: java/lang/VMThreadManager.notifyAll(Ljava/lang/Object;)I (VMThreadManager.java:-2)
>   2: java/lang/Object.notifyAll()V (Object.java:65)
>   3: java/lang/Thread.runImpl()V (Thread.java:667)
> <end of stack trace>
> This bug causes the failure of the reliability test
>      api.kernel.thread.ExcptHandlerTest.ExcptHandlerTest 
> from http://issues.apache.org/jira/browse/HARMONY-2918

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