C++ PHP Extension Segfaults Under Apache.

["Bruce Bailey" <bruce1828 at hotmail dot com>]

Hi

Please let me know if there's a better forum for this question . . .

I have been trying mightily to resolve a rather sticky problem and would 
really appreciate any suggestions as to how I can resolve this.

There are really two problems:

1.  Starting apache in normal run mode ? apache dies immediately with no 
logs or core files.  Since Apache forks, I can't get gdb to trace the 
process that aborts.

2.  Starting apache in single process mode (-X) runs OK until I try to 
append to an std::string, at which time it aborts in 
std::string::_Rep::_S_create (see backtrace, below).  The function  
std::string::assign has a this pointer with an address of 0x3!

Do either of these (especially the 2nd) sound like a known problem?
Any suggestions as to how to track down what's happening?

Thanks in advance,

Bruce

Calling structure:

mainline (httpd) ?C? Apache/1.3.33
dlopen (apache module) libphp5.so ?C? PHP 5.1.4
dlopen (php extension) my PHP extension ?C++?
loads my library ?C++?


Software versions:

g++ (GCC) 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
Copyright (C) 2002 Free Software Foundation, Inc.

Linux C621177 2.4.21-40.EL.1-3 #1 SMP Thu Apr 5 13:31:00 PDT 2007 i686 i686 
i386 GNU/Linux


Program received signal SIGSEGV, Segmentation fault.
std::string::_Rep::_S_create (__capacity=3, __alloc=@0xbfffa1b0)
   at 
/usr/src/build/146482-i386/BUILD/gcc-3.2-20020903/obj-i386-redhat-linux/i386-redhat-linux/libstdc++-v3/include/bits/stl_alloc
.h:397
397     
/usr/src/build/146482-i386/BUILD/gcc-3.2-20020903/obj-i386-redhat-linux/i386-redhat-linux/libstdc++-v3/include/bits/stl_allo
c.h: No such file or directory.
       in 
/usr/src/build/146482-i386/BUILD/gcc-3.2-20020903/obj-i386-redhat-linux/i386-redhat-linux/libstdc++-v3/include/bits/stl_a
lloc.h
Current language:  auto; currently c++
(gdb) bt
#0  std::string::_Rep::_S_create (__capacity=3, __alloc=@0xbfffa1b0)
   at 
/usr/src/build/146482-i386/BUILD/gcc-3.2-20020903/obj-i386-redhat-linux/i386-redhat-linux/libstdc++-v3/include/bits/stl_alloc
.h:397
#1  0xb63a2eed in std::string::_M_mutate (this=0xbfffa310, __pos=0, 
__len1=0, __len2=3)
   at 
/usr/src/build/146482-i386/BUILD/gcc-3.2-20020903/obj-i386-redhat-linux/i386-redhat-linux/libstdc++-v3/include/bits/basic_str
ing.h:403
#2  0xb6858cb2 in std::string::_M_replace_safe<char const*> 
(this=0xbfffa310, __i1=
     {<std::iterator<std::random_access_iterator_tag, char, int, char*, 
char&>> = {<No data fields>}, _M_current = 0xb63e978c ""},
__k1=0x85178e0 "1.0", __k2=0x85178e3 "") at 
/usr/include/c++/3.2/bits/basic_string.tcc:534
#3  0xb63a3a6f in std::string::assign (this=0x3, __n=3)
   at 
/usr/src/build/146482-i386/BUILD/gcc-3.2-20020903/obj-i386-redhat-linux/i386-redhat-linux/libstdc++-v3/include/bits/basic_str
ing.h:242
#4  0xb67d1d40 in CEOAPINode::StoreAttributes (this=0x85137d0, 
attrs=@0x85012a0) at /usr/include/c++/3.2/bits/char_traits.h:135
#5  0xb67d40df in CEOAPIRequest::StoreAttributes (this=0x85137d0, 
attrs=@0x85012a0) at EOAPIRequest.cpp:76
#6  0xb67cafae in CEOAPIEventHandler::startElement (this=0xbfffc7c0, 
uri=0x8513208, localname=0x85133c8, qname=0x8513378,
   attrs=@0x85012a0) at EOAPIEventHandler.cpp:147
#7  0xb65e4064 in xercesc_2_7::SAX2XMLReaderImpl::startElement () from 
/abc/lib/libxerces-c.so.27
#8  0xb65a8482 in xercesc_2_7::IGXMLScanner::scanStartTagNS () from 
/abc/lib/libxerces-c.so.27
#9  0xb65a4e7c in xercesc_2_7::IGXMLScanner::scanContent () from 
/abc/lib/libxerces-c.so.27
#10 0xb65a3a1d in xercesc_2_7::IGXMLScanner::scanDocument () from 
/abc/lib/libxerces-c.so.27
#11 0xb65e3591 in xercesc_2_7::SAX2XMLReaderImpl::parse () from 
/abc/lib/libxerces-c.so.27
#12 0xb67da541 in EOAPI_ProcessXML::processXML (
   xml=0x84f8b94 "<?xml version=\"1.0\" 
encoding=\"UTF-8\"?>\r\n<eoapi:Request 
xmlns:eoapi=\"http://www.abc.com/eoapi\"; version=\"1
.0\" ShowUnknownElementErrors=\"Yes\" 
ShowTiming=\"No\">\r\n\t<Session>\r\n\t\t<Connection>\r\n\t\t\t<Host>ryukyu"...,
   returnAddress=0x8504204 "", out=@0xbfffc8a0) at EOAPI_ProcessXML.cpp:238
#13 0xb68e7ce7 in zif_eoapi_processxml () from /abc/lib/php_eoapi.so.1.1
#14 0xb7250999 in zend_do_fcall_common_helper_SPEC (execute_data=0xbfffcb40)
   at 
/releases/SW812/working/SW/abc/bin/php/linux/php-5.1.4/Zend/zend_vm_execute.h:200
#15 0xb59de47b in get_module () from 
/abc/local/Zend/lib/Optimizer-2.6.1/php-5.1.x/ZendOptimizer.so
#16 0xbfffcb40 in ?? ()
#17 0x085040c4 in ?? ()
#18 0x00000011 in ?? ()
#19 0xacbf7522 in ?? ()
#20 0x08501a74 in ?? ()
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