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Bug #14862 xmldocfile segfaults sometimes
Submitted: 2002-01-04 18:09 UTC Modified: 2002-01-05 04:24 UTC
From: chregu@php.net Assigned:
Status: Closed Package: DOM XML related
PHP Version: 4.0CVS-2002-01-04 OS: linux
Private report: No CVE-ID: None
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 [2002-01-04 18:09 UTC] chregu@php.net 
xmldocfile produces from time to time segfaults at shutdown (not always, sometimes more, sometimes less...)

code:
$xmlDoc = xmldocfile("test.xml");

xml: any.

"workaround" (does the same jobs right, just in more lines :) )

$fd = fopen( $datasrc, "r" );
$xmlstring = fread( $fd, filesize( $datasrc ) );
fclose( $fd );
$xmlDoc = xmldoc($xmlstring);

backtrace:

0x40224b0b in zend_hash_index_find (ht=0x403747a4, h=1075888551, 
    pData=0xbfffef38) at zend_hash.c:935
935                     if ((p->h == h) && (p->nKeyLength == 0)) {
(gdb) bt
#0  0x40224b0b in zend_hash_index_find (ht=0x403747a4, h=1075888551, 
    pData=0xbfffef38) at zend_hash.c:935
#1  0x402257e8 in _zend_list_delete (id=1075888551) at zend_list.c:53
#2  0x4021bc43 in _zval_dtor (zvalue=0x812653c, 
    __zend_filename=0x403385bc "zend_execute_API.c", __zend_lineno=274)
    at zend_variables.c:64
#3  0x40211e0c in _zval_ptr_dtor (zval_ptr=0x8126990, 
    __zend_filename=0x40338a13 "zend_variables.c", __zend_lineno=189)
    at zend_execute_API.c:274
#4  0x4021c08d in _zval_ptr_dtor_wrapper (zval_ptr=0x8126990)
    at zend_variables.c:189
#5  0x40223a1a in zend_hash_destroy (ht=0x812657c) at zend_hash.c:541
#6  0x4021bc0f in _zval_dtor (zvalue=0x812dc04, 
    __zend_filename=0x403385bc "zend_execute_API.c", __zend_lineno=274)
    at zend_variables.c:57
#7  0x40211e0c in _zval_ptr_dtor (zval_ptr=0x8126ba8, 
    __zend_filename=0x40338a13 "zend_variables.c", __zend_lineno=189)
    at zend_execute_API.c:274
#8  0x4021c08d in _zval_ptr_dtor_wrapper (zval_ptr=0x8126ba8)
    at zend_variables.c:189
#9  0x40223a1a in zend_hash_destroy (ht=0x40374688) at zend_hash.c:541
#10 0x40211977 in shutdown_executor () at zend_execute_API.c:173
#11 0x4021d2f3 in zend_deactivate () at zend.c:596
#12 0x4022f95b in php_request_shutdown (dummy=0x0) at main.c:736
#13 0x4022b8e8 in apache_php_module_main (r=0x811b234, display_source_mode=0)
    at sapi_apache.c:96
#14 0x4022c7a8 in send_php (r=0x811b234, display_source_mode=0, 
    filename=0x811bd4c "/usr/local/apache/htdocs/buch/domxml/newfunctions.php")
    at mod_php4.c:575
#15 0x4022c82b in send_parsed_php (r=0x811b234) at mod_php4.c:590
#16 0x08073b29 in ap_invoke_handler ()
#17 0x0808893f in process_request_internal ()
#18 0x080889a6 in ap_process_request ()
#19 0x0807f886 in child_main ()
#20 0x0807fa41 in make_child ()
#21 0x0807fbbc in startup_children ()
#22 0x0808024d in standalone_main ()
#23 0x08080aac in main ()
#24 0x400be65f in __libc_start_main () from /lib/libc.so.6

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 [2002-01-04 18:55 UTC] mfischer@php.net 
Seems to depend on the input data. No matter how much stress testing I do, I can't reproduce a crash.

Please provide some crashing input data too.
 [2002-01-04 19:01 UTC] chregu@php.net 
it's sometimes not easy to cause a segfault, but if you once have one, then they come very often :) and with the following xml-data, it shouldn't take long...

<?xml version="1.0"?>
<buecher bla="bla">
<buch buch_id="1" isbn="3-8266-0612-4">
<titel>Apache Web-Server</titel>
<jahr>2000</jahr>
<kategorie>2</kategorie>
</buch>
</buecher>
 [2002-01-04 19:09 UTC] mfischer@php.net 
Doesn't segfault either ... (used ab for testing, this should really be it).

What's your configure line, which apache version?
 [2002-01-05 04:24 UTC] chregu@php.net 
Ok, i give up. Today, I can't reproduce it, either.
If it occurs again, i will reopen this bug.
 
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