[FUG-BR] Segmentation fault (core dumped)

Danilo Egea daniloegea em yahoo.com.br
Quarta Maio 25 18:29:43 BRT 2011 

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________________________________
De: Jose Raimundo da S. Barbosa <jose.barbosa at cpaa.embrapa.br>
Para: freebsd at fug.com.br
Enviadas: Quarta-feira, 25 de Maio de 2011 16:41
Assunto: [FUG-BR] Segmentation fault (core dumped)

Olá pessoal,

preciso de uma ajuda de vocês, já esgotei quase todos meus recursos e 
antes que eu lance mão dos outros gostaria de ter mais embasamento.

Depois de uma atualização do FreeBSD 7.2 para a 7.4 fiquei com alguns 
problemas (Core Dumped) em alguns serviços, mas especificamente àqueles 
que dependiam do Perl para a realização de algumas operações. Depois de 
algumas tentativas, resolvi logo fazer o upgrade (nas ponta dos dedos, 
sempre com frio na barriga) para a versão 8.4. Fiz como reza o manual: 
Atualização de ports, make buildword, etc...

Então, para minha frustração, os problemas ainda persistem. Pelas 
minhas análises, conforme os resultados dos teste abaixo, verifiquei que 
o problema começava quando o Perl fazia chamadas para algumas operações 
que envolvem SSL. Recompilei OpenSSL (por tabela as suas dependências) e 
durante esse processo houveram alguns breaks que foram sendo consertados 
até que pudesse ter uma compilação de 100% para todos que dependiam 
deste. Tive algum sucesso, visto que o debug do core não mais 
apresentava os erros de antes.

Os erros que aparecem agora no debug do arquivo "perl.core" são 
mostrados abaixo juntamente com minhas configurações do ambiente:

Alguma luz? Qualquer ajuda é muito bem-vinda. Pelos menos os serviços 
críticos não estão parados.

Dmesg parcial
--------------
Copyright (c) 1992-2011 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 
1994
         The Regents of the University of California. All rights 
reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.2-STABLE #0: Sun May 15 11:52:05 AMT 2011
    root at columbalivia.cpaa.embrapa.br:/usr/obj/usr/src/sys/GENERIC 
amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz (2333.43-MHz 
K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x10676  Family = 6  Model = 17  
Stepping = 6
  
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  
Features2=0xce3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1>
   AMD Features=0x20000800<SYSCALL,LM>
   AMD Features2=0x1<LAHF>
   TSC: P-state invariant
real memory  = 8589934592 (8192 MB)
avail memory = 8251072512 (7868 MB)
ACPI APIC Table: <HP     ProLiant>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s)


# uname -a

FreeBSD columbalivia.cpaa.embrapa.br 8.2-STABLE FreeBSD 8.2-STABLE #0: 
Sun May 15 11:52:05 AMT 2011    
root at columbalivia.cpaa.embrapa.br:/usr/obj/usr/src/sys/GENERIC  amd64


Exemplo de teste para identificar o problema

# /usr/local/sbin/smbldap-useradd -w "maqteste"
Segmentation fault (core dumped)

(aqui foi gerado o arquivo perl.core)

debugando o arquivo perl.core

# gdb perl perl.core
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and 
you are
welcome to change it and/or distribute copies of it under certain 
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for 
details.
This GDB was configured as "amd64-marcel-freebsd"...
Core was generated by `perl'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so...done.
Loaded symbols for /usr/local/lib/perl5/5.10.1/mach/CORE/libperl.so
Reading symbols from /lib/libm.so.5...done.
Loaded symbols for /lib/libm.so.5
Reading symbols from /lib/libcrypt.so.5...done.
Loaded symbols for /lib/libcrypt.so.5
Reading symbols from /lib/libutil.so.8...done.
Loaded symbols for /lib/libutil.so.8
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/auto/Cwd/Cwd.so...done.
Loaded symbols for /usr/local/lib/perl5/5.10.1/mach/auto/Cwd/Cwd.so
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/auto/IO/IO.so...done.
Loaded symbols for /usr/local/lib/perl5/5.10.1/mach/auto/IO/IO.so
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/auto/Socket/Socket.so...done.
Loaded symbols for 
/usr/local/lib/perl5/5.10.1/mach/auto/Socket/Socket.so
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/auto/Encode/Encode.so...done.
Loaded symbols for 
/usr/local/lib/perl5/5.10.1/mach/auto/Encode/Encode.so
Reading symbols from 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Unicode/String/String.so...done.
Loaded symbols for 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Unicode/String/String.so
Reading symbols from 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Unicode/Map/Map.so...done.
Loaded symbols for 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Unicode/Map/Map.so
Reading symbols from 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Unicode/Map8/Map8.so...done.
Loaded symbols for 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Unicode/Map8/Map8.so
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/auto/Encode/Unicode/Unicode.so...done.
Loaded symbols for 
/usr/local/lib/perl5/5.10.1/mach/auto/Encode/Unicode/Unicode.so
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/auto/List/Util/Util.so...done.
Loaded symbols for 
/usr/local/lib/perl5/5.10.1/mach/auto/List/Util/Util.so
Reading symbols from 
/usr/local/lib/perl5/5.10.1/mach/auto/Encode/JP/JP.so...done.
Loaded symbols for 
/usr/local/lib/perl5/5.10.1/mach/auto/Encode/JP/JP.so
Reading symbols from /usr/local/lib/nss_ldap.so.1...done.
Loaded symbols for /usr/local/lib/nss_ldap.so.1
Reading symbols from /usr/local/lib/libldap-2.4.so.8...done.
Loaded symbols for /usr/local/lib/libldap-2.4.so.8
Reading symbols from /usr/local/lib/liblber-2.4.so.8...done.
Loaded symbols for /usr/local/lib/liblber-2.4.so.8
Reading symbols from /usr/local/lib/libsasl2.so.2...done.
Loaded symbols for /usr/local/lib/libsasl2.so.2
Reading symbols from /usr/lib/libkrb5.so.10...done.
Loaded symbols for /usr/lib/libkrb5.so.10
Reading symbols from /usr/lib/libcom_err.so.5...done.
Loaded symbols for /usr/lib/libcom_err.so.5
Reading symbols from /usr/lib/libgssapi_krb5.so.10...done.
Loaded symbols for /usr/lib/libgssapi_krb5.so.10
Reading symbols from /usr/lib/libfetch.so.6...done.
Loaded symbols for /usr/lib/libfetch.so.6
Reading symbols from /usr/local/lib/libssl.so.7...done.
Loaded symbols for /usr/local/lib/libssl.so.7
Reading symbols from /usr/local/lib/libcrypto.so.7...done.
Loaded symbols for /usr/local/lib/libcrypto.so.7
Reading symbols from /usr/lib/libgssapi.so.10...done.
Loaded symbols for /usr/lib/libgssapi.so.10
Reading symbols from /usr/lib/libhx509.so.10...done.
Loaded symbols for /usr/lib/libhx509.so.10
Reading symbols from /lib/libcrypto.so.6...done.
Loaded symbols for /lib/libcrypto.so.6
Reading symbols from /usr/lib/libroken.so.10...done.
Loaded symbols for /usr/lib/libroken.so.10
Reading symbols from /usr/lib/libasn1.so.10...done.
Loaded symbols for /usr/lib/libasn1.so.10
Reading symbols from /usr/lib/libssl.so.6...done.
Loaded symbols for /usr/lib/libssl.so.6
Reading symbols from /lib/libmd.so.5...done.
Loaded symbols for /lib/libmd.so.5
Reading symbols from 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Net/SSLeay/SSLeay.so...done.
Loaded symbols for 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Net/SSLeay/SSLeay.so
Reading symbols from /lib/libz.so.5...done.
Loaded symbols for /lib/libz.so.5
Reading symbols from 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Socket6/Socket6.so...done.
Loaded symbols for 
/usr/local/lib/perl5/site_perl/5.10.1/mach/auto/Socket6/Socket6.so
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x000000080352e7b0 in EVP_MD_CTX_md () from /lib/libcrypto.so.6
(gdb)
(gdb)
(gdb) bt
#0  0x000000080352e7b0 in EVP_MD_CTX_md () from /lib/libcrypto.so.6
#1  0x0000000802e31dfc in tls1_enc () from /usr/local/lib/libssl.so.7
#2  0x0000000802e2a6b5 in do_ssl3_write () from 
/usr/local/lib/libssl.so.7
#3  0x0000000802e2ab14 in ssl3_write_bytes () from 
/usr/local/lib/libssl.so.7
#4  0x0000000802e2ce9d in ssl3_do_write () from 
/usr/local/lib/libssl.so.7
#5  0x0000000802e26fcc in ssl3_connect () from 
/usr/local/lib/libssl.so.7
#6  0x0000000803bfbee8 in XS_Net__SSLeay_connect (cv=Variable "cv" is 
not available.
) at SSLeay.c:1274
#7  0x00000008007acd02 in Perl_pp_entersub () at pp_hot.c:2888
#8  0x00000008007583fc in Perl_runops_debug () at dump.c:1968
#9  0x00000008006a4b68 in S_run_body (oldscope=1) at perl.c:2431
#10 0x00000008006a3f30 in perl_run (my_perl=0x801204104) at perl.c:2349
#11 0x0000000000400bf4 in main (argc=5, argv=0x7fffffffea78, 
env=0x7fffffffeaa8)
     at perlmain.c:117
(gdb) q
#

Desde já agradeço.

---
José Raimundo da S. Barbosa


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