[FUG-BR] chunk already is free()

[Rodrigo Salvador]

Caros,

tenho um programa escrito em c++, que utiliza Threads com a lib 
ulxmlrpcpp e é executado como WebService em um FreeBSD 6.1. Tenho também 
inúmeras classes que definem as funções publicadas para o WebService, e 
essas classes manipulam arquivos e algumas vezes executam um comando no 
shell (via system()).

Entretando algumas vezes o programa quebra com a mensagem "chunk already 
is free()", e não estou conseguindo identificar o ponto onde isso ocorre.

Tomei o cuidado de colocar log em todas as linhas para rastrear o ponto 
da falha, mas não tive resultado.
A edição de arquivos é feita usando um esquema de lock para concorrência 
de edição de arquivo.
Aloquei todos os objetos usando "new" e "delete", mas também não resolveu.

Procurei inúmeras vezes no google sobre a origem desta falha, mas ainda 
não achei. Alguém pode me dar uma luz e apontar onde devo olhar ?!
Segue o conteúdo do core gerado.

gdb /usr/sbin/flydnsd flydnsd.core
GNU gdb 6.1.1 [FreeBSD]
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Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd"...(no debugging symbols 
found)...
Core was generated by `flydnsd'.
Program terminated with signal 6, Aborted.
Reading symbols from /lib/libmd.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libmd.so.2
Reading symbols from /usr/local/lib/libulxmlrpcpp.so.13...(no debugging 
symbols found)...done.
Loaded symbols for /usr/local/lib/libulxmlrpcpp.so.13
Reading symbols from /usr/lib/libstdc++.so.4...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libstdc++.so.4
Reading symbols from /lib/libm.so.3...(no debugging symbols found)...done.
Loaded symbols for /lib/libm.so.3
Reading symbols from /lib/libc.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.5
Reading symbols from /usr/lib/libpthread.so.1...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libpthread.so.1
Reading symbols from /usr/local/lib/libexpat.so.6...(no debugging 
symbols found)...done.
Loaded symbols for /usr/local/lib/libexpat.so.6
Reading symbols from /lib/libcrypto.so.3...(no debugging symbols 
found)...done.
Loaded symbols for /lib/libcrypto.so.3
Reading symbols from /usr/lib/libssl.so.3...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libssl.so.3
Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols 
found)...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x2833f31b in pthread_testcancel () from /usr/lib/libpthread.so.1
(gdb) where
#0  0x2833f31b in pthread_testcancel () from /usr/lib/libpthread.so.1
#1  0x2832e54b in sigaction () from /usr/lib/libpthread.so.1
#2  0x2832e260 in sigaction () from /usr/lib/libpthread.so.1
#3  0x28337902 in pthread_mutexattr_init () from /usr/lib/libpthread.so.1
#4  0x00000000 in ?? ()
(gdb)


vlw

Rodrigo