PHP dumps core when compiled with both LDAP and OCI8. The reason is the Oracle client libraries include an LDAP library, and PHP is calling the Oracle ldap_modify_s instead of the OpenLDAP ldap_modify_s. We are using OpenLDAP 1.2.11 and Oracle 8.1.6.

Short-term workaround: use LD_PRELOAD, e.g. add:

LD_PRELOAD=/usr/local/ldap/lib/libldap.so
export LD_PRELOAD

to your Apache start scripts.

Here is the gdb backtrace:

(gdb) r -X -f /usr/local/apache/conf/httpd-kefta.conf
Starting program: /usr/local/apache/bin/httpd -X -f /usr/local/apache/conf/httpd
-kefta.conf
[New LWP 1]
[New LWP 2]
[New LWP 3]
warning: Lowest section in /usr/lib/libintl.so.1 is .dynamic at 00000074
[New LWP 4]
warning: Lowest section in /usr/lib/libintl.so.1 is .dynamic at 00000074

Program received signal SIGSEGV, Segmentation fault.
0xde589e0a in gsleenSBerPrintf () from /export/home/oracle/lib/libclntsh.so.8.0
(gdb) bt
#0  0xde589e0a in gsleenSBerPrintf ()
   from /export/home/oracle/lib/libclntsh.so.8.0
#1  0xde580234 in gslcmom_Modify ()
   from /export/home/oracle/lib/libclntsh.so.8.0
#2  0xde57d8e7 in ldap_modify_s ()
   from /export/home/oracle/lib/libclntsh.so.8.0
#3  0xdee2f440 in php_ldap_do_modify (ht=3, return_value=0x81f5d0c,
    this_ptr=0x0, return_value_used=0, oper=2) at ldap.c:1364
#4  0xdee2f5e1 in zif_ldap_modify (ht=3, return_value=0x81f5d0c, this_ptr=0x0,
    return_value_used=0) at ldap.c:1399
#5  0xdedd51b9 in execute (op_array=0x8195fc0) at ./zend_execute.c:1590
#6  0xdedd540c in execute (op_array=0x819296c) at ./zend_execute.c:1630
#7  0xdede66b0 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at zend.c:814
#8  0xdedf98c1 in php_execute_script (primary_file=0x8047808) at main.c:1307
#9  0xdedf3d4a in apache_php_module_main (r=0x818a750, display_source_mode=0)
    at sapi_apache.c:90
#10 0xdedf4f00 in send_php (r=0x818a750, display_source_mode=0,
    filename=0x818c338 "/usr/local/apache/htdocs/mail/mailforward.php")
    at mod_php4.c:575
#11 0xdedf4f73 in send_parsed_php (r=0x818a750) at mod_php4.c:590
#12 0x8088945 in ap_invoke_handler (r=0x818a750) at http_config.c:517
#13 0x809e794 in process_request_internal (r=0x818a750) at http_request.c:1308
#14 0x809e7fe in ap_process_request (r=0x818a750) at http_request.c:1324
---Type <return> to continue, or q <return> to quit---q
Quit
(gdb) i sym

Here is the final link stage in compiling PHP. Please note -lldap is supplied before -lclntsh, and thus OpenLDAP should resolve first, but apparently this is not the case:

/bin/sh /home/majid/src/php-4.1.2/libtool --silent --mode=link gcc  -I. -I/home/
majid/src/php-4.1.2/ -I/home/majid/src/php-4.1.2/main -I/home/majid/src/php-4.1.
2 -I/usr/local/ldap/include -I/export/home/oracle/rdbms/demo -I/export/home/orac
le/network/public -Iexpat/xmltok -Iexpat/xmlparse -Iimap-4.7c/c-client -I/usr/lo
cal/apache/include -I/home/majid/src/php-4.1.2/Zend -I/usr/local/include/freetyp
e -I/usr/local/include -I/usr/local/ldap/include -I/usr/local/mysql/include/mysq
l -I/export/home/oracle/rdbms/public -I/export/home/oracle/rdbms/demo -I/export/
home/oracle/network/public -I/home/majid/src/php-4.1.2/ext/xml/expat  -D_POSIX_P
THREAD_SEMANTICS -DSOLARIS2=280 -DMOD_SSL=208106 -DEAPI -DEAPI_MM -DUSE_EXPAT -I
/home/majid/src/php-4.1.2/TSRM -g -DEAPI -prefer-pic   -o libphp4.la -rpath /hom
e/majid/src/php-4.1.2/libs -export-symbols /home/majid/src/php-4.1.2/sapi/apache
/php.sym -avoid-version -L/usr/ucblib -L/usr/local/lib/gcc-lib/i386-pc-solaris2.
8/2.95.2 -L/usr/local/lib -L/usr/local/ldap/lib -L/usr/local/mysql/lib/mysql -L/
export/home/oracle/lib  -R /usr/ucblib -R /usr/local/lib/gcc-lib/i386-pc-solaris
2.8/2.95.2 -R /usr/local/lib -R /usr/local/ldap/lib -R /usr/local/mysql/lib/mysq
l -R /export/home/oracle/lib stub.lo  Zend/libZend.la  sapi/apache/libsapi.la  m
ain/libmain.la  regex/libregex.la  ext/gd/libgd.la ext/imap/libimap.la ext/ldap/
libldap.la ext/mhash/libmhash.la ext/mysql/libmysql.la ext/oci8/liboci8.la ext/p
cre/libpcre.la ext/posix/libposix.la ext/session/libsession.la ext/standard/libs
tandard.la ext/xml/libxml.la  TSRM/libtsrm.la -L/usr/local/ldap/lib -L/usr/local
/lib -lgd -lmhash -llber -lldap -L/export/home/oracle/lib -lclient8 -lclntsh -L/
usr/local/mysql/lib/mysql -lmysqlclient -lpam -limap -ldl -lm -lthread -laio -le
lf -ldl -lgen -lnsl -lsocket -lmysqlclient -lmhash -lldap -llber -lcrypt -lpam -
lgd -lttf -lcrypt -lresolv -lresolv -lresolv -lm -ldl -lnsl -lsocket -lsocket -l
gcc -lcrypt -lclntsh