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From gmanohar <>
Subject [users@httpd] segfault while migrating from RHEL4 to centOS 4.2 on apache 2.2.4 as proxy
Date Thu, 11 Jun 2009 10:42:28 GMT

I need some help in migrating our existing code from RHEL4 to centOS 4.2.
We use apache configured as a proxy server and ,we have an out filter
module registered with apache 2.2.4, where we gets the page content and
do some processing based on the content.
Everything worked fine in RHEL4 but when the same code was migrated to
CentOS4.2 and compiled there ,a segmentation fault  occurs while loading
the module.
we have some infilter modules also registered but did not face any
problem with loading them, the issue is with the loading the out filter.

details of the setup
apache was configured with following command

./configure --prefix=/usr/local/apache2
--enable-mods-shared="proxy_connect proxy_ftp proxy_http proxy status
rewrite deflate" --with-mpm=worker --with-included-apr

uname -a :
Linux 2.6.9-22.ELsmp #1 SMP Sat Oct 8
19:11:43 CDT 2005 i686 i686 i386 GNU/Linux

gcc version:

Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-java-awt=gtk
Thread model: posix
gcc version 3.4.4 20050721 (Red Hat 3.4.4-2)

The following is the back trace using gdb.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208027456 (LWP 16497)]
0x009d9641 in __gnu_cxx::__exchange_and_add () from /usr/lib/
(gdb) bt
#0  0x009d9641 in __gnu_cxx::__exchange_and_add () from
#1  0x00ee4fc5 in __tcf_4 () from
#2  0x0013b6e4 in __cxa_finalize () from /lib/tls/
#3  0x00eaacea in __do_global_dtors_aux () from
#4  0x00f184de in _fini () from
#5  0x0020df6b in _dl_close () from /lib/tls/
#6  0x00418d5a in dlclose_doit () from /lib/
#7  0x00a9d07e in _dl_catch_error () from /lib/
#8  0x004192bb in _dlerror_run () from /lib/
#9  0x00418d8a in dlclose () from /lib/
#10 0x00b260b5 in dso_cleanup (thedso=0x9ba8ed0) at dso/unix/dso.c:72
#11 0x00b2b2d1 in run_cleanups (cref=0x9b240b8) at
#12 0x00b2c04d in apr_pool_clear (pool=0x9b240a8) at
#13 0x08062024 in main (argc=3, argv=0xbff26764) at main.c:667
(gdb) q

Did some one face the same problem ,or can anyone give me an idea
regarding the problem/solution.

Thanks & regards,

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