Here's the link to the PHP bug report

http://bugs.php.net/bug.php?id=38534



Do you want to include a small comment in the documentation to alert 
users of this issue ?

You need to send the backtrace to the PHP bugs site, not us.

Horde 3.1.3, IMP 4.1.3, Apache/2.0.52, PHP 4.3.9 on RHEL4 (SELinux disabled)



$conf['log']['priority'] = PEAR_LOG_DEBUG

$conf['sessionhandler']['type'] = 'pgsql';



This genereates a segmentation fault in several pages (most of the 
time on the login page, but others are affected too). Changing to 
$conf['log']['priority'] = PEAR_LOG_INFO or setting the sessionhandler 
to 'none' solves the issue.



Here's the information from the httpd core dump and gdb:



#0  0x00ad1a2c in memcpy () from /lib/tls/libc.so.6

(gdb) bt

#0  0x00ad1a2c in memcpy () from /lib/tls/libc.so.6

#1  0x00e9534b in _mem_block_check (ptr=0x9a08b84, silent=0, 
__zend_filename=0xed9970 
"/usr/src/redhat/BUILD/php-4.3.9/ext/standard/string.c", 
__zend_lineno=3127,

     __zend_orig_filename=0x0, __zend_orig_lineno=0) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_alloc.c:675

#2  0x00e9530d in _mem_block_check (ptr=0x9a08b84, silent=1, 
__zend_filename=0xed9970 
"/usr/src/redhat/BUILD/php-4.3.9/ext/standard/string.c", 
__zend_lineno=3127,

     __zend_orig_filename=0x0, __zend_orig_lineno=0) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_alloc.c:667

#3  0x00e944cb in _efree (ptr=0x9a08b84, __zend_filename=0xed9970 
"/usr/src/redhat/BUILD/php-4.3.9/ext/standard/string.c", 
__zend_lineno=3127,

     __zend_orig_filename=0x0, __zend_orig_lineno=0) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_alloc.c:243

#4  0x00e41b24 in zif_setlocale (ht=2, return_value=0x9a18344, 
this_ptr=0x0, return_value_used=0) at 
/usr/src/redhat/BUILD/php-4.3.9/ext/standard/string.c:3127

#5  0x00ebd4f6 in execute (op_array=0x91657cc) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute.c:1640

#6  0x00ebd771 in execute (op_array=0x93210ac) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute.c:1684

#7  0x00e9e977 in call_user_function_ex (function_table=0x9332000, 
object_pp=0x932a768, function_name=0x932178c, 
retval_ptr_ptr=0xbfe9ebe4, param_count=2,

     params=0x9723fac, no_separation=1, symbol_table=0x0) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute_API.c:567

#8  0x00e9df81 in call_user_function (function_table=0x901ab18, 
object_pp=0x0, function_name=0x932a844, retval_ptr=0x9a1bccc, 
param_count=2, params=0xbfe9ec68)

     at /usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute_API.c:409

#9  0x00dde06e in ps_call_handler (func=0x932a844, argc=2, 
argv=0xbfe9ec68) at 
/usr/src/redhat/BUILD/php-4.3.9/ext/session/mod_user.c:60

#10 0x00dde695 in ps_write_user (mod_data=0xf07310, key=0x92d698c 
"555d66f42dd88768d0c97638a5a2c821",

     val=0x9a64164 
"imp|a:29:{s:5:\"cache\";a:0:{}s:4:\"pass\";s:7:\"v\036\032?207\rN\";s:11:\"_logintasks\";i:0;s:4:\"user\";s:11:\"xxxxxxxxxxx\";s:8:\"uniquser\";s:23:\"xxxxxxxxxxxxxxxxxxxxxxx\";s:6:\"server\";s:9:\"localhost\";s:3:\"acl\";b:0;s:5:\""..., vallen=80476) at 
/usr/src/redhat/BUILD/php-4.3.9/ext/session/mod_user.c:148

#11 0x00dd9d27 in php_session_save_current_state () at 
/usr/src/redhat/BUILD/php-4.3.9/ext/session/session.c:696

#12 0x00ddd123 in php_session_flush () at 
/usr/src/redhat/BUILD/php-4.3.9/ext/session/session.c:1605

#13 0x00ddd14e in zm_deactivate_session (type=1, module_number=8) at 
/usr/src/redhat/BUILD/php-4.3.9/ext/session/session.c:1619

#14 0x00eaccea in module_registry_cleanup (module=0x90b7df8) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_API.c:1167

#15 0x00eafea3 in zend_hash_apply (ht=0xf0b720, apply_func=0xeacca7 
<module_registry_cleanup>) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_hash.c:703

#16 0x00ea8954 in zend_deactivate_modules () at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend.c:652

#17 0x00e6b6c2 in php_request_shutdown (dummy=0x0) at 
/usr/src/redhat/BUILD/php-4.3.9/main/main.c:993

#18 0x00ec3079 in php_apache_request_dtor (r=0x911c948) at 
/usr/src/redhat/BUILD/php-4.3.9/sapi/apache2handler/sapi_apache2.c:461

#19 0x00ec384c in php_handler (r=0x911c948) at 
/usr/src/redhat/BUILD/php-4.3.9/sapi/apache2handler/sapi_apache2.c:595

#20 0x002839d7 in ap_run_handler () from /usr/sbin/httpd

#21 0x00283e43 in ap_invoke_handler () from /usr/sbin/httpd

#22 0x002808c5 in ap_process_request () from /usr/sbin/httpd

#23 0x0027b63f in _start () from /usr/sbin/httpd

#24 0x0911c948 in ?? ()

#25 0x00000004 in ?? ()

#26 0x0911c948 in ?? ()

#27 0x09110450 in ?? ()

#28 0x091108ff in ?? ()

#29 0x00000000 in ?? ()

(gdb) frame 5

#5  0x00ebd4f6 in execute (op_array=0x91657cc) at 
/usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute.c:1640

1640                                                             
((zend_internal_function *) 
EX(function_state).function)->handler(EX(opline)->extended_value, 
EX(Ts)[EX(opline)->result.u.var].var.ptr, EX(object).ptr, 
return_value_used TSRMLS_CC);

(gdb) print (char 
*)(executor_globals.function_state_ptr->function)->common.function_name

$1 = 0xed1dfd "setlocale"

(gdb) print (char *)executor_globals.active_op_array->function_name

$2 = 0x9163cfc "logmessage"

(gdb) print (char *)executor_globals.active_op_array->filename

$3 = 0x9164544 "/var/www/html/horde-3.1.3/lib/Horde.php"