comment on

I found the root cause of the problem. use encoding "utf8" caused the segmentation fault. I removed it. Problem is gone. However, I got "corrupted double-linked list" at run time. It does not always happen. Sometimes the program works fine. Sometimes, I got "corrupted double-linked list". Program died when it happened. Below are the messages. I have no clue what causes it. Any idea?

*** glibc detected *** /usr/bin/perl: corrupted double-linked list: 0x
+000000000bbec430 ***
======= Backtrace: =========
/lib64/libc.so.6[0x366cc70583]
/lib64/libc.so.6[0x366cc7222c]
/lib64/libc.so.6(cfree+0x4b)[0x366cc7273b]
/usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so(perl_
+destruct+0xffa)[0x366dc3966a]
/usr/bin/perl(main+0xb3)[0x401773]
/lib64/libc.so.6(__libc_start_main+0xf4)[0x366cc1d994]
/usr/bin/perl[0x401609]
======= Memory map: ========
00400000-00403000 r-xp 00000000 08:03 75519                           
+   /usr/bin/perl
00602000-00604000 rw-p 00002000 08:03 75519                           
+   /usr/bin/perl
0a327000-0c5c3000 rw-p 0a327000 00:00 0                               
+   [heap]
422bd000-422be000 ---p 422bd000 00:00 0 
422be000-42cbe000 rw-p 422be000 00:00 0 
42cbe000-42cbf000 ---p 42cbe000 00:00 0 
42cbf000-436bf000 rw-p 42cbf000 00:00 0 
436bf000-436c0000 ---p 436bf000 00:00 0 
436c0000-440c0000 rw-p 436c0000 00:00 0 
3513c00000-3513d38000 r-xp 00000000 08:03 2523842                     
+   /usr/lib/libxml2.so.2.7.8
3513d38000-3513f37000 ---p 00138000 08:03 2523842                     
+   /usr/lib/libxml2.so.2.7.8
3513f37000-3513f41000 rw-p 00137000 08:03 2523842                     
+   /usr/lib/libxml2.so.2.7.8
3513f41000-3513f42000 rw-p 3513f41000 00:00 0 
366c800000-366c81c000 r-xp 00000000 08:03 1638708                     
+   /lib64/ld-2.5.so
366ca1b000-366ca1c000 r--p 0001b000 08:03 1638708                     
+   /lib64/ld-2.5.so
366ca1c000-366ca1d000 rw-p 0001c000 08:03 1638708                     
+   /lib64/ld-2.5.so
366cc00000-366cd4d000 r-xp 00000000 08:03 1638709                     
+   /lib64/libc-2.5.so
366cd4d000-366cf4d000 ---p 0014d000 08:03 1638709                     
+   /lib64/libc-2.5.so
366cf4d000-366cf51000 r--p 0014d000 08:03 1638709                     
+   /lib64/libc-2.5.so
366cf51000-366cf52000 rw-p 00151000 08:03 1638709                     
+   /lib64/libc-2.5.so
366cf52000-366cf57000 rw-p 366cf52000 00:00 0 
366d000000-366d082000 r-xp 00000000 08:03 1638712                     
+   /lib64/libm-2.5.so
366d082000-366d281000 ---p 00082000 08:03 1638712                     
+   /lib64/libm-2.5.so
366d281000-366d282000 r--p 00081000 08:03 1638712                     
+   /lib64/libm-2.5.so
366d282000-366d283000 rw-p 00082000 08:03 1638712                     
+   /lib64/libm-2.5.so
366d400000-366d402000 r-xp 00000000 08:03 1638608                     
+   /lib64/libdl-2.5.so
366d402000-366d602000 ---p 00002000 08:03 1638608                     
+   /lib64/libdl-2.5.so
366d602000-366d603000 r--p 00002000 08:03 1638608                     
+   /lib64/libdl-2.5.so
366d603000-366d604000 rw-p 00003000 08:03 1638608                     
+   /lib64/libdl-2.5.so
366d800000-366d816000 r-xp 00000000 08:03 1638711                     
+   /lib64/libpthread-2.5.so
366d816000-366da15000 ---p 00016000 08:03 1638711                     
+   /lib64/libpthread-2.5.so
366da15000-366da16000 r--p 00015000 08:03 1638711                     
+   /lib64/libpthread-2.5.so
366da16000-366da17000 rw-p 00016000 08:03 1638711                     
+   /lib64/libpthread-2.5.so
366da17000-366da1b000 rw-p 366da17000 00:00 0 
366dc00000-366dd2b000 r-xp 00000000 08:03 202553                      
+   /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so
366dd2b000-366df2b000 ---p 0012b000 08:03 202553                      
+   /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so
366df2b000-366df34000 rw-p 0012b000 08:03 202553                      
+   /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so
366df34000-366df36000 rw-p 366df34000 00:00 0 
3670000000-367000d000 r-xp 00000000 08:03 1638714                     
+   /lib64/libgcc_s-4.1.2-20080825.so.1
367000d000-367020d000 ---p 0000d000 08:03 1638714                     
+   /lib64/libgcc_s-4.1.2-20080825.so.1
367020d000-367020e000 rw-p 0000d000 08:03 1638714                     
+   /lib64/libgcc_s-4.1.2-20080825.so.1
3673800000-3673815000 r-xp 00000000 08:03 1638453                     
+   /lib64/libnsl-2.5.so
3673815000-3673a14000 ---p 00015000 08:03 1638453                     
+   /lib64/libnsl-2.5.so
3673a14000-3673a15000 r--p 0Abort
[download]

Here is my system info:
uname -a
Linux 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
perl -v
This is perl, v5.8.8 built for x86_64-linux-thread-multi
Copyright 1987-2006, Larry Wall
Modules I used

use strict;
use warnings;
use threads;
use Scalar::Util 'reftype';
use Data::Dumper;
use CGI qw(:standard Vars);
use LWP::UserAgent;
use XML::Simple;
[download]

In reply to Re^8: Parallel Modules ? by Gary Yang
in thread Parallel Modules ? by Gary Yang

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