* glibc detected * corrupted double-linked list: 0x004ec848 ***

hi,
I am using Berkeley DB database and facing a problem while retrieving records. After building database i'm retrieving records from that database.After retrieving some records it gives the error as
*** glibc detected *** corrupted double-linked list: 0x004ec848 *** Aborted. What can i do solve this problem.
Thank you,
ravi

Hi Ravi,
Have you googled for the error message? What are the results?
A good thing to do is to provide me a test program and more details about your operating system environment. Also, try to update your glibc version.
Regards,
Bogdan Coman

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*** glibc detected *** corrupted double-linked list: 0x0027f878 ***

users are getting this error
{noformat}*** glibc detected *** corrupted double-linked list: 0x0027f878 ***{noformat}{noformat} {noformat}
what could the issue for above error,
in concurrent reqest out put,
Apps:12i
os: Linux

Sawwan,
Request language is :
AMERICAN
Request territory is :
AMERICA
Previous NLS_LANG Environment Variable was :
AMERICAN_AMERICA.WE8ISO8859P15
Current NLS_LANG and NLS_NUMERIC_CHARACTERS Environment Variables are :
AMERICAN_AMERICA.WE8ISO8859P15
stat_low = 6
stat_high = 0
emsg:was terminated by signal 6
Enter Password:
*** glibc detected *** corrupted double-linked list: 0x0027f878 ***
Report Builder: Release 10.1.2.0.2 - Production on Wed Mar 18 09:02:51 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Start of log messages from FND_FILE
End of log messages from FND_FILE
Reset original NLS_LANG in environment as :
AMERICAN_AMERICA.WE8ISO8859P15
Program was terminated by signal 6
Concurrent Manager encountered an error while running Oracle*Report for your concurrent request xxxxxxx

*** glibc detected *** corrupted double-linked list: 0x093c3e18 ***????????

Hai,
i got this message at command prompt.
o/s version : rhel es 4.0
what was this error. i was running oracle applications on this operating system.
please advice me

Hai,
.......It seems like it iscaused by some programming error.
hat commands/programs were you executing when seeing
this error?
at os level or ??????????/////...
What commands/programs were you executing when seeing this error?

Corrupted double-linked list

I have been upgrading wine and I keep running into problems running Guildwars. Every time I upgrade wine to a newer version using pacman the program will not work correctly and freezes. So I have to downgrade to wine 1.1.20. When I run wine thru terminal I get
*** glibc detected *** c:\Program Files\Guild Wars\Gw.exe: corrupted double-linked list: 0x7d4bc4f8 ***
======= Backtrace: =========
/lib/libc.so.6(+0x6b6c1)[0xb75dc6c1]
/lib/libc.so.6(+0x6d003)[0xb75de003]
/lib/libc.so.6(cfree+0x6d)[0xb75e0f8d]
/usr/lib/libGLcore.so.1(+0x5964af)[0xb6b8d4af]
[0x200000]
/usr/lib/libGLcore.so.1(+0x5ed980)[0xb6be4980]
[0x138808b]
I think this is because somehow libc.so.6 and libGlcore.so.1 is double linked. If so how do I find where they are linked to and how do I get rid of the wrong link. I can only find one /lib/libc.so.6 and only one /usr/lib/libGLcore.so.1 so there are not two of each. Am I going in the right direction?

That error does not mean a link as in a symbolic link, but as in a data structure in the code. See http://en.wikipedia.org/wiki/Linked_list for the idea. The trace is saying that somewhere in libGLcore, there is a linked list which is being corrupted somehow. This is an error inside the code, and not with your filesystem, so that would not be a way to fix it. Check out the wine app database at http://appdb.winehq.org/ to see if anyone has had your problem.

*** glibc detected *** xmlcopyeditor: double free or corruption (out)

I am trying to run a program called *** glibc detected *** xmlcopyeditor: ======= Backtrace: =========
/lib/libc.so.6(+0x6b6c1)[0xb67186c1]
/lib/libc.so.6(+0x6cf18)[0xb6719f18]
/lib/libc.so.6(cfree+0x6d)[0xb671cf8d]
/usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0xb690a901]
xmlcopyeditor[0x80d657a]
/usr/lib/libexpat.so.1(+0x8c5b)[0xb6e7dc5b]
xmlcopyeditor[0x80cb7c6]
xmlcopyeditor[0x8081f43]
xmlcopyeditor[0x809648b]
xmlcopyeditor[0x806e8fc]
xmlcopyeditor[0x806539a]
xmlcopyeditor(_ZN12wxAppConsole10CallOnInitE /usr/lib/libwx_baseu-2.8.so.0(_Z7wxEntryRiPP /usr/lib/libwx_baseu-2.8.so.0(_Z7wxEntryRiPP xmlcopyeditor[0x8063ce7]
/lib/libc.so.6(__libc_start_main+0xe6)[0xb66c3b86]
======= Memory map: ========
08048000-0814a000 r-xp 00000000 08:02 1060710 0814a000-0814c000 rwxp 00101000 08:02 1060710 0814c000-08154000 rwxp 00000000 00:00 08409000-08673000 rwxp 00000000 00:00 0 b4b00000-b4b21000 rwxp 00000000 00:00 b4b21000-b4c00000 ---p 00000000 00:00 b4c16000-b4c18000 r-xp 00000000 08:02 788505 b4c18000-b4c19000 r-xp 00001000 08:02 788505 b4c19000-b4c1a000 rwxp 00002000 08:02 788505 b4c1a000-b4c26000 r-xp 00000000 08:02 1192136 b4c26000-b4c35000 r-xp 00000000 08:02 1192133 b4c35000-b4c42000 r-xp 00000000 08:02 1192141 b4c42000-b4c53000 r-xp 00000000 08:02 1192140 b4c53000-b4c93000 r-xs 00000000 08:02 4564 b4c93000-b4c9e000 r-xp 00000000 08:02 395 b4c9e000-b4c9f000 rwxp 0000b000 08:02 395 b4c9f000-b4cb2000 r-xp 00000000 08:02 829351 b4cb2000-b4cb3000 rwxp 00012000 08:02 829351 b4cb3000-b4cd6000 r-xp 00000000 08:02 829375 b4cd6000-b4cd7000 rwxp 00022000 08:02 829375 b4cdb000-b4ceb000 r-xs 00000000 08:02 4108 b4ceb000-b4d06000 r-xs 00000000 08:02 4565 b4d06000-b4d46000 r-xs 00000000 08:02 4556 b4d46000-b4d5e000 r-xs 00000000 08:02 813375 b4d5e000-b4fc4000 r-xp 00000000 08:02 974778 b4fc4000-b5604000 r-xp 00000000 08:02 938009 b5604000-b5664000 rwxs 00000000 00:08 2195476 b5664000-b5679000 r-xp 00000000 08:02 825928 b5679000-b567a000 rwxp 00014000 08:02 825928 b567a000-b56e1000 r-xp 00000000 08:02 812119 b56e1000-b56e3000 rwxp 00067000 08:02 812119 b56e3000-b57e4000 rwxp 00000000 00:00 b57e4000-b57f7000 r-xp 00000000 08:02 829680 b57f7000-b57f8000 rwxp 00012000 08:02 829680 b57fd000-b5803000 r-xs 00000000 08:02 3566 b5803000-b5813000 r-xp 00000000 08:02 829374 b5813000-b5814000 rwxp 00010000 08:02 829374 b5814000-b5864000 r-xp 00000000 08:02 829731 b5864000-b5865000 rwxp 0004f000 08:02 829731 b5865000-b5885000 r-xp 00000000 08:02 852930 b5885000-b5886000 rwxp 00020000 08:02 852930 b5886000-b588d000 r-xp 00000000 08:02 802310 b588d000-b588e000 rwxp 00007000 08:02 802310 b588e000-b589a000 r-xp 00000000 08:02 826000 b589a000-b589b000 rwxp 0000b000 08:02 826000 b589b000-b58c2000 r-xp 00000000 08:02 824194 b58c2000-b58c3000 rwxp 00027000 08:02 824194 b58c3000-b5a74000 r-xp 00000000 08:02 816237 b5a74000-b5aab000 r-xp 00000000 08:02 817362 b5aab000-b5aac000 r-xp 00036000 08:02 817362 b5aac000-b5aad000 rwxp 00037000 08:02 817362 b5aad000-b5ac9000 r-xp 00000000 08:02 800217 b5ac9000-b5aca000 rwxp 0001b000 08:02 800217 b5aca000-b5ad0000 r-xp 00000000 08:02 823101 b5ad0000-b5ad1000 rwxp 00005000 08:02 823101 b5ad1000-b5ad3000 r-xp 00000000 08:02 93 b5ad3000-b5ad4000 r-xp 00001000 08:02 93 b5ad4000-b5ad5000 rwxp 00002000 08:02 93 b5ad5000-b5ad8000 rwxs 00000000 00:08 2162707 b5ad8000-b5ae5000 r-xp 00000000 08:02 829734 b5ae5000-b5ae6000 rwxp 0000d000 08:02 829734 b5ae6000-b5b27000 r-xp 00000000 08:02 823514 b5b27000-b5b2b000 rwxp 00041000 08:02 823514 b5b2d000-b5b34000 r-xp 00000000 08:02 824196 b5b34000-b5b35000 rwxp 00006000 08:02 824196 b5b35000-b5b43000 r-xp 00000000 08:02 827110 b5b43000-b5b44000 rwxp 0000d000 08:02 827110 b5b44000-b5b46000 r-xp 00000000 08:02 927712 b5b46000-b5b47000 rwxp 00001000 08:02 927712 b5b47000-b5bdd000 r-xp 00000000 08:02 811888 b5bdd000-b5be1000 rwxp 00095000 08:02 811888 b5be1000-b5be5000 rwxp 00000000 00:00 b5be6000-b5beb000 r-xp 00000000 08:02 824190 b5beb000-b5bec000 rwxp 00004000 08:02 824190 b5bec000-b5bef000 r-xp 00000000 08:02 827105 b5bef000-b5bf0000 rwxp 00003000 08:02 827105 b5bf0000-b5bf4000 r-xp 00000000 08:02 827122 From searching google, this errors Thanks. XMLCopyEditor and I keep getting this in the terminal:
double free or corruption (out): 0x086646e8 ***
/> eD0Ev+0x23)[0x809cfcd]
14RefHashTableOfINS_7GrammarENS_12StringHasherEED1Ev+0x54)[0xb6ac8b94]
15GrammarResolverD1Ev+0x2c)[0xb6b5bc2c]
17AbstractDOMParser7cleanUpEv+0x62)[0xb6b3c232]
17AbstractDOMParserD2Ev+0x4c)[0xb6b3c5ec]
15XercesDOMParserD0Ev+0x50)[0xb6b4ee90]
/> /> /> /> [0xb6e7772c]
/> v+0x18)[0x809a3f6]
w+0x40)[0xb6f1b950]
c+0x37)[0xb6f1bb57]
/> /usr/local/bin/xmlcopyeditor
/usr/local/bin/xmlcopyeditor
0
[heap]
0
0
/usr/lib/gconv/UTF-16.so
/usr/lib/gconv/UTF-16.so
/usr/lib/gconv/UTF-16.so
/usr/share/fonts/TTF/VeraMoBd.ttf
/usr/share/fonts/TTF/VeraBd.ttf
/usr/share/fonts/TTF/VeraMono.ttf
/usr/share/fonts/TTF/Vera.ttf
/var/cache/fontconfig/17090aa38d5c6f09fb8c5c354938f1d7-x86.cache-2
/lib/libudev.so.0.5.0
/lib/libudev.so.0.5.0
/usr/lib/libgvfscommon.so.0.0.0
/usr/lib/libgvfscommon.so.0.0.0
/usr/lib/gio/modules/libgvfsdbus.so
/usr/lib/gio/modules/libgvfsdbus.so
/var/cache/fontconfig/8d4af663993b81a124ee82e610bb31f9-x86.cache-2
/var/cache/fontconfig/f6b893a7224233d96cb72fd88691c0b4-x86.cache-2
/var/cache/fontconfig/df311e82a1a24c41a75c2c930223552e-x86.cache-2
/usr/share/mime/mime.cache
/usr/share/icons/hicolor/icon-theme.cache
/usr/share/icons/gnome/icon-theme.cache
/SYSV00000000 (deleted)
/usr/lib/libart_lgpl_2.so.2.3.20
/usr/lib/libart_lgpl_2.so.2.3.20
/usr/lib/libgnomeprint-2-2.so.0.1.0
/usr/lib/libgnomeprint-2-2.so.0.1.0
0
/usr/lib/libelf-0.8.12.so
/usr/lib/libelf-0.8.12.so
/var/cache/fontconfig/d62e99ef547d1d24cdb1bd22ec1a2976-x86.cache-2
/usr/lib/gio/modules/libgioremote-volume-monitor.so
/usr/lib/gio/modules/libgioremote-volume-monitor.so
/usr/lib/bug-buddy/libbreakpad.so.0.0.0
/usr/lib/bug-buddy/libbreakpad.so.0.0.0
/usr/lib/gtk-2.0/2.10.0/engines/libmurrine.so
/usr/lib/gtk-2.0/2.10.0/engines/libmurrine.so
/usr/lib/libltdl.so.7.2.0
/usr/lib/libltdl.so.7.2.0
/usr/lib/libtdb.so.1.1.3
/usr/lib/libtdb.so.1.1.3
/usr/lib/libvorbis.so.0.4.3
/usr/lib/libvorbis.so.0.4.3
/usr/lib/locale/locale-archive
/usr/lib/libdbus-1.so.3.4.0
/usr/lib/libdbus-1.so.3.4.0
/usr/lib/libdbus-1.so.3.4.0
/usr/lib/libdbus-glib-1.so.2.1.0
/usr/lib/libdbus-glib-1.so.2.1.0
/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so
/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so
/lib/libutil-2.11.so
/lib/libutil-2.11.so
/lib/libutil-2.11.so
/SYSV00000000 (deleted)
/usr/lib/gtk-2.0/modules/libgnomebreakpad.so
/usr/lib/gtk-2.0/modules/libgnomebreakpad.so
/usr/lib/libhunspell-1.2.so.0.0.0
/usr/lib/libhunspell-1.2.so.0.0.0
/usr/lib/libvorbisfile.so.3.3.2
/usr/lib/libvorbisfile.so.3.3.2
/usr/lib/libcanberra.so.0.2.1
/usr/lib/libcanberra.so.0.2.1
/usr/lib/enchant/libenchant_zemberek.so
/usr/lib/enchant/libenchant_zemberek.so
/usr/lib/libaspell.so.15.1.4
/usr/lib/libaspell.so.15.1.4
0
/usr/lib/libogg.so.0.6.0
/usr/lib/libogg.so.0.6.0
/usr/lib/libcanberra-gtk.so.0.1.4
/usr/lib/libcanberra-gtk.so.0.1.4
/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
comes from trying to free allocated memory that doesn't exist. This program worked before but I am not sure what would be different. There may be a bad upgrade. Anyways, I cannot make heads or tails of the backtrace and memory map. Anyone know where the offending library could be?

Since this is happening with the same program then it probably does have something to do with the program or a library, however if you have recently changed the memory in your PC then it can also cause things like this to happen. In fact, adding a certain stick of ram to my PC was the only time I've ever seen a message like this appear

[svn:bz-trunk] 18926: bug fix BLZ-570 Double linked list with lot of objects result in BlazeDS Error deserializing error : StackOverflowError

Revision: 18926
Revision: 18926
Author:   [email protected]
Date:     2010-12-01 14:07:19 -0800 (Wed, 01 Dec 2010)
Log Message:
bug fix BLZ-570 Double linked list with lot of objects result in BlazeDS Error deserializing error : StackOverflowError
We put hard limit to the max object nest level to prevent StackOverFlowError. the default max object nest level is 1024 and it can be configured in the endpoint/serialziation section in service-config.xml.
This needs documentation.
Checkintests pass
Ticket Links:
    http://bugs.adobe.com/jira/browse/BLZ-570
Modified Paths:
    blazeds/trunk/modules/common/src/flex/messaging/errors.properties
    blazeds/trunk/modules/core/src/flex/messaging/endpoints/AbstractEndpoint.java
    blazeds/trunk/modules/core/src/flex/messaging/io/SerializationContext.java
    blazeds/trunk/modules/core/src/flex/messaging/io/amf/Amf0Input.java
    blazeds/trunk/modules/core/src/flex/messaging/io/amf/Amf3Input.java
    blazeds/trunk/modules/core/src/flex/messaging/io/amf/AmfIO.java

[svn:bz-4.0.0_fixes] 20451: backporting bug fix BLZ-570/ BLZ-620 Double linked list with lot of objects result in BlazeDS Error deserializing error : StackOverflowError We put hard limit to the max object nest level to prevent StackOverFlowError .

Revision: 20451
Revision: 20451
Author:   [email protected]
Date:     2011-02-24 08:33:31 -0800 (Thu, 24 Feb 2011)
Log Message:
backporting bug fix BLZ-570/BLZ-620 Double linked list with lot of objects result in BlazeDS Error deserializing error : StackOverflowError We put hard limit to the max object nest level to prevent StackOverFlowError. the default max object nest level is 1024 and it can be configured in the endpoint/serialziation section in service-config.xml. This needs documentation. Checkintests pass
Ticket Links:
    http://bugs.adobe.com/jira/browse/BLZ-570
    http://bugs.adobe.com/jira/browse/BLZ-620
Modified Paths:
    blazeds/branches/4.0.0_fixes/modules/common/src/flex/messaging/errors.properties
    blazeds/branches/4.0.0_fixes/modules/core/src/flex/messaging/endpoints/AbstractEndpoint.j ava
    blazeds/branches/4.0.0_fixes/modules/core/src/flex/messaging/io/SerializationContext.java
    blazeds/branches/4.0.0_fixes/modules/core/src/flex/messaging/io/amf/Amf0Input.java
    blazeds/branches/4.0.0_fixes/modules/core/src/flex/messaging/io/amf/Amf3Input.java
    blazeds/branches/4.0.0_fixes/modules/core/src/flex/messaging/io/amf/AmfIO.java

Dear Pallavi,
Very useful post!
I am looking for similar accelerators for
Software Inventory Accelerator
Hardware Inventory Accelerator
Interfaces Inventory
Customization Assessment Accelerator
Sizing Tool
Which helps us to come up with the relevant Bill of Matetials for every area mentioned above, and the ones which I dont know...
Request help on such accelerators... Any clues?
Any reply, help is highly appreciated.
Regards
Manish Madhav

[svn:bz-3.x] 20443: back porting bug fix BLZ-570/ BLZ-620 Double linked list with lot of objects result in BlazeDS Error deserializing error : StackOverflowError We put hard limit to the max object nest level to prevent StackOverFlowError .

Revision: 20443
Revision: 20443
Author:   [email protected]
Date:     2011-02-23 21:19:22 -0800 (Wed, 23 Feb 2011)
Log Message:
back porting bug fix BLZ-570/BLZ-620 Double linked list with lot of objects result in BlazeDS Error deserializing error : StackOverflowError We put hard limit to the max object nest level to prevent StackOverFlowError. the default max object nest level is 1024 and it can be configured in the endpoint/serialziation section in service-config.xml. This needs documentation. Checkintests pass
Ticket Links:
    http://bugs.adobe.com/jira/browse/BLZ-570
    http://bugs.adobe.com/jira/browse/BLZ-620
Modified Paths:
    blazeds/branches/3.x/modules/common/src/java/flex/messaging/errors.properties
    blazeds/branches/3.x/modules/core/src/java/flex/messaging/endpoints/AbstractEndpoint.java
    blazeds/branches/3.x/modules/core/src/java/flex/messaging/io/SerializationContext.java
    blazeds/branches/3.x/modules/core/src/java/flex/messaging/io/amf/Amf0Input.java
    blazeds/branches/3.x/modules/core/src/java/flex/messaging/io/amf/Amf3Input.java
    blazeds/branches/3.x/modules/core/src/java/flex/messaging/io/amf/AmfIO.java

Search in Double link list in java

Can any body give me the code implementation for searching an element in double link list in java as soon as possible...

Can any body give me the code implementation for
searching an element in double link list in java as
soon as possible...Psuedo code...
current = head of list
found = null
while(current is not null)
   if doesItMatch(current, target)
        break
   current = current->next
if (current is null) Out("no match")
else Out("found it")

Implementing Double Linked Lists

I have been set a task creating a java class to implement the data cells of a double linked list, then improving on this class so that it will implemt the interface of a LinearList using a double linked list.
HELP?!?!?!?!

i have implemented a small method.u can implement the remaining methods as u want. I have not tested the code. Just for idea i am giving it. try it.
public class Node{
     Node leftNode;
     Node rightNode;
     int data;
     public Node addNode(Node node,int data,int position){
          Node originalCopy=node;
          for(int i=0;i<position;i++){
               Node tempNode=new Node();
               tempNode.data=data;
               tempNode.leftNode=node;
               tempNode.rightNode=node.rightNode;
               node=node.rightNode;
          return originalCopy;
This class represents a Doubly linked list and it provides operations on it.

Delphi Double Linked List to Java

Does a Delphi Double Linked List correspond to any data type in Java?
Thanks for your time,
Nate

Look at the documentationf for java.util.*, in particular the collections therein.
java.util.LinkedList is probably closest to what you want.

Double Linked Lists

Hi everyone,
I have some problems about Double Linked Lists which I can not overcome. When I execute the following codes, there is an exception occured that is called NullPointer Exception in inser method.
So how can I fix it ??
class DoublyLinkedNode {
     // properties
     DoublyLinkedNode nextNode;
     DoublyLinkedNode previousNode;
     int size;
     int data;
     // constructors
     public DoublyLinkedNode(int data,DoublyLinkedNode nextNode, DoublyLinkedNode previousNode){
          this.data = data;
          this.nextNode = nextNode;
          this.previousNode = previousNode;
          size = 0;
     // methods
     public void setNext(DoublyLinkedNode next){
          nextNode = next;
     public void setPrevious(DoublyLinkedNode pre){
          previousNode = pre;
     public DoublyLinkedNode getNext(){
          return nextNode;
     public DoublyLinkedNode getPrevious(){
          return previousNode;
     public int getData(){
          return data;
     public void setData(int value){
          data = value;
class DoubleLinkedList {
     // properties
     int size;
     DoublyLinkedNode tail;
     DoublyLinkedNode head;
     String s = "";
     // constructors
     public DoubleLinkedList(){
          head = null;
          tail = null;
          size = 0;
     // methods
     public boolean isEmpty(){
          if(head == null)
               return true;
          else
               return false;
     public DoublyLinkedNode next(){
          return head.getNext();
     public DoublyLinkedNode previous(){
          return head.getPrevious();
     public void insert(int data){
          head = new DoublyLinkedNode(data, head.getNext(),head.getPrevious());
          size++;
     public String toString(){
          s += head.getData() + "";
          head = head.getNext();
          if(isEmpty())
               return s;
          else
               return toString();
     public static void main(String args[]){
          DoubleLinkedList list = new DoubleLinkedList();
          list.insert(111);
          list.insert(21);
          list.insert(311);
          list.insert(41);
          list.insert(51);
          list.insert(16);
          list.insert(117);
          System.out.println(list.toString());
//          for(int a = 0; a < 5; a++){
//               list.previous();
}

Again, I changed insert method which is now correct I think.
But now, toString cause only appear the last object on the console.
So how can I fix toString method ???
     public void insert(int data){
          DoublyLinkedNode pointer = head.getPrevious();
          DoublyLinkedNode pointer2 = pointer.getNext();
          head = new DoublyLinkedNode(data,pointer2, pointer );
     }

Circular Double Linked List

If the circular double linked list has only one item, will that item's next/previous node references point to itself?

Yeah, it would make sense. But I'm wondering if there's any standard?
It could also make sense for the references to simply be null.

Hashing with double linked list....

Okay, everything compiles great but I'm getting a NullPointerException upon running the program.
'line' is a string from a file to let you know that much. 'firstnode', 'nownode', and 'lastnode' are pointers in my array linked list 'anArray'. I know clever names. lol But hey, my professor uses variable names like 'X' 'T' and 'G' all the time, confusing bastard. :-) Anywho... I put a note in the code so you can see where this exception is taking place. Any help is 100% welcomed and appreciated!
     while( line != null )
     int hashindex = hash(line, 20);
     if(firstnode[hashindex] == null)
             firstnode[hashindex] = nownode[hashindex] = lastnode[hashindex] = new ListNode( line );
     else
             nownode[hashindex] = new ListNode( line );
//This line is the exception, if I comment it out, the next line throws it
          anArray[hashindex].CONS(nownode[hashindex], lastnode[hashindex]);
          anArray[hashindex].LCONS(lastnode[hashindex], nownode[hashindex]);
//If I comment out the 2 lines above this line DOES NOT throw an exception, weird
          lastnode[hashindex] = nownode[hashindex];
     line = input.readLine();
     }

Okay, here's some more code... Just the top portion of the program. Keep in mind that methods like CONS, LCONS, CDR, and LCDR are just using the ListNode methods such as .ptr and stuff... My professor makes us use this ADT he provided. I can post ALL code if you would like but I dont think all that is necessary.
static BufferedReader input, console;
static List hashtable = new List();
static List[] anArray = new List[20];
static ListNode[] nownode, firstnode, lastnode;
static String message = "";
static int nodecount = 0;
public static void openFile()
//Opens the file for input and throws and exception if the file is not there
     File taskFile = new File("prices.txt");
     try
         input = new BufferedReader(new FileReader( taskFile ));
     catch( FileNotFoundException fileNotFoundException )
     outputStuff("Error", "The file does not exist!", "error");
public synchronized static void setupTable() throws IOException
     firstnode = new ListNode[20];
     nownode = new ListNode[20];
     lastnode = new ListNode[20];
     String line = input.readLine();
     firstnode[0] = nownode[0] = lastnode[0] = new ListNode( line );
     while( line != null )
     hashindex = hash(line, 20);
     if(firstnode[hashindex] == null)
             firstnode[hashindex] = nownode[hashindex] = lastnode[hashindex] = new ListNode( line );
     else
             nownode[hashindex] = new ListNode( line );
          anArray[hashindex].CONS(nownode[hashindex], lastnode[hashindex]);
          anArray[hashindex].LCONS(lastnode[hashindex], nownode[hashindex]);
          lastnode[hashindex] = nownode[hashindex];
     line = input.readLine();
     for(int i = 0; i <= 20; i++)
          while( nownode[i] != null)
          message += "String = " + anArray.info( nownode[i], 0 ) + "\tIndex = " + i + "\n";
     nownode[i] = anArray[i].CDR(nownode[i]);
     outputStuff("test", message, "blah");
}//End setupTable

Sorted Double Linked List.

public class DLinkedList {
class Node {
String data;
Node next = null;
Node prev = null;
public Node(String o, Node n, Node p){
data = o;
next = n;
prev = p;
private int max;
private Node head;
private Node current = null;
public DLinkedList(int max_size) {
head = null;
current = null;
max = max_size;
public boolean isEmpty() {
public void insert(String o) {
Node n;
while (current != null && o.compareToIgnoreCase(current.data) > 0)
current.prev = current;
current = current.next;
if (current.prev == null)
// First Item in List
n = new Node(o, current, null);
else
current.prev.next = new Node(o, current, current.prev);
I am working on the insert and keep getting a null pointer exception. Can someone point me in the right direction.
Thanks

if (current.prev == null)
// First Item in List
n = new Node(o, current, null);
}This code right here will cause a NullPointerException if current is still null, which is one of the possible exit conditions in your loop.

*** glibc detected *** corrupted double-linked list: 0x004ec848 ***

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* glibc detected * corrupted double-linked list: 0x004ec848 ***