Sir:
	I need your help now.
	I use dlopen() loading a special dynamic library and use dlclose
() closing it.
	But,the process received signal 11 and zombied after it had been 
executed for some hours.I get the core file
and attempt debuging it using gdb.
	the output is:
###########################################################################
##############
#gdb process_name core
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libserver_objs.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libdirectory.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libwebtokens.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libnotification.so...done.
Reading symbols from /opt/netdata/lib/libdtw.so...done.
Reading symbols from /opt/WebSphere/CommerceSuite/bin/libldap.so.1...done.
Reading symbols from /opt/netdata/lib/libdtwle.so...done.
Reading symbols from /opt/netdata/lib/libdtwmem.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libadmin_objs.so...done.
Reading symbols from /opt/WebSphere/CommerceSuite/bin/libbilling.so...done.
Reading symbols from /opt/WebSphere/CommerceSuite/bin/libon.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libcsp_admin.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libadmin_cmd.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libmassimpt.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libnc3_utilmsgs.so...done.
Reading symbols 
from /opt/WebSphere/CommerceSuite/bin/libIXXML4C2_3.so...done.
Reading symbols from /opt/WebSphere/CommerceSuite/bin/libicu-uc.so...done.
#0  0x4000771b in _dl_lookup_symbol (undef_name=0x4115b504 "_._6String", 
ref=0xbffff190, symbol_scope=0x80f145f, 
    
reference_name=0x80f1280 "/opt/WebSphere/CommerceSuite/bin/libbilling.so", 
reloc_type=7) at do-lookup.h:70
70	do-lookup.h: No such file or directory.
(gdb) frame
#0  0x4000771b in _dl_lookup_symbol (undef_name=0x4115b504 "_._6String", 
ref=0xbffff190, symbol_scope=0x80f145f, 
    
reference_name=0x80f1280 "/opt/WebSphere/CommerceSuite/bin/libbilling.so", 
reloc_type=7) at do-lookup.h:70
70	in do-lookup.h
Current language:  auto; currently c
(gdb) info stack
#0  0x4000771b in _dl_lookup_symbol (undef_name=0x4115b504 "_._6String", 
ref=0xbffff190, symbol_scope=0x80f145f, 
    
reference_name=0x80f1280 "/opt/WebSphere/CommerceSuite/bin/libbilling.so", 
reloc_type=7) at do-lookup.h:70
/**************************
 Symbol "_._6String" can be finded using 'nm -l libbilling.so | grep 
_._6String'.
	output is 00006728 W _._6String /opt/.../ldh_string.h:501
	the 501 line of the ldh_string.h file is destructor function.
****************************/
#1  0x4000a823 in fixup (l=0x80f12b8, reloc_offset=26) at dl-runtime.c:88
#2  0x4000a970 in _dl_runtime_resolve () at dl-runtime.c:182
#3  0x4115de9d in __do_global_dtors_aux () 
from /opt/WebSphere/CommerceSuite/bin/libbilling.so
#4  0x411616cd in ?? () from /opt/WebSphere/CommerceSuite/bin/libbilling.so
#5  0x40ad2ec9 in _dl_close (map=0x80f4728) at dl-close.c:77
#6  0x409d3430 in dlclose_doit (handle=0x80f4728) at dlclose.c:26
#7  0x4000ac3b in _dl_catch_error (errstring=0x80cc788, operate=0x409d3418 
<dlclose_doit>, args=0x80f4728) at dl-error.c:141
#8  0x409d38b9 in _dlerror_run (operate=0x409d3418 <dlclose_doit>, 
args=0x80f4728) at dlerror.c:125
#9  0x409d33fe in dlclose (handle=0x80f4728) at dlclose.c:32
#10 0x40109aa9 in OS_Dll::Free (this=0x80f45b8) at os.cpp:1997/* Free(): 
this function only call dlclose() */
#11 0x40108a3e in OS::FreeLibrary (libname=@0x8094114) at os.cpp:1384
#12 0x4011e725 in NC_DllContent::UnLoad (this=0x8094110) 
at ../../include/common/registry.h:298
#13 0x4011ba04 in NC_DllContent::~NC_DllContent (this=0x8094110, 
__in_chrg=3) at registry.cpp:85
#14 0x4004fbc0 in NC_PList::Clean (this=0x806a6f4, del=true) at 
ldh_list.cpp:66
#15 0x8056238 in NC_PList::~NC_PList (this=0x806a6f4, __in_chrg=2) 
at ../../include/containers/ldh_list.h:73
#16 0x40163a69 in TemplateNC_PList<NC_DllContent, 
String>::~TemplateNC_PList (this=0x806a6f4, __in_chrg=2) 
at ../../include/containers/ldh_list.h:176
#17 0x4011c1bb in NC_Registry::~NC_Registry (this=0x806a6f0, __in_chrg=3) 
at registry.cpp:166
#18 0x40113a5c in NC_CommandManager::~NC_CommandManager (this=0x806a6f0, 
__in_chrg=3) at cmd_manager.cpp:246
#19 0x40113c2c in NC_CommandManagerSentry::~NC_CommandManagerSentry 
(this=0xbffff4af, __in_chrg=2) at cmd_manager.cpp:268
#20 0x805185b in main (argc=5, argv=0xbffff624) at server.cpp:760
(gdb) 
###########################################################################
##############

I compile the C++ source code using 'g++ -shared -o aaa.so'.

Platform:
	RedHat 6.2
	kernel: kernel-2.2.14-5.0
	gcc: egcs-2.91.66
	glibc: glibc-2.1.3
	
I am hurry.Can you give some hints?

Dai Baohua write.