From: rickard at punbb dot org
Operating system: Linux 2.4
PHP version: 5CVS-2004-02-05 (dev)
PHP Bug Type: Reproducible crash
Bug description: Segfault when calling phpinfo() after ob_start()
Description:
------------
PHP segfaults when calling phpinfo() with output buffering started. If the
call to ob_start() is left out, the code works fine.
I really don't know how to interpret the backtrace, but if I'm correct,
the problem is in the Standard PHP Library (SPL). On line 109 of
spl_functions.c, there is a call to strlen() with the parameter pce->name.
However, according to the backtrace, pce equals 0x0. Could this be what is
causing the problem?
To test my assumption, I recompiled PHP with --disable-spl and the
segfault no longer occurs. How output buffering comes into the picture is
beyond me.
Reproduce code:
---------------
<?php
ob_start();
phpinfo();
?>
Expected result:
----------------
phpinfo() should be displayed.
Actual result:
--------------
(gdb) bt
#0 spl_add_class_name (list=0xbfffd5cc, pce=0x0, allow=1, ce_flags=8)
at /root/src/php5-200402051830/ext/spl/spl_functions.c:109
#1 0x08098b5a in spl_add_classes (ppce=0x81f6028, list=0xbfffd5cc,
sub=0,
allow=1, ce_flags=8)
at /root/src/php5-200402051830/ext/spl/spl_functions.c:141
#2 0x0809832d in zm_info_spl (zend_module=0x825f888)
at /root/src/php5-200402051830/ext/spl/php_spl.c:205
#3 0x08103f44 in _display_module_info (module=0x825f888, arg=0xbfffd6d0)
at /root/src/php5-200402051830/ext/standard/info.c:76
#4 0x08182bbe in zend_hash_apply_with_argument (ht=0xbfffd728,
apply_func=0x8103ed4 <_display_module_info>, argument=0xbfffd6d0)
at /root/src/php5-200402051830/Zend/zend_hash.c:677
#5 0x0810582e in php_print_info (flag=-1)
at /root/src/php5-200402051830/ext/standard/info.c:562
#6 0x08106ebe in zif_phpinfo (ht=0, return_value=0x4022177c,
this_ptr=0x0,
return_value_used=0) at
/root/src/php5-200402051830/ext/standard/info.c:882
#7 0x081b58ff in zend_do_fcall_common_helper (execute_data=0xbfffd8b0,
opline=0x40221d58, op_array=0x40221b94)
at /root/src/php5-200402051830/Zend/zend_execute.c:2560
#8 0x081b607d in zend_do_fcall_handler (execute_data=0xbfffd8b0,
opline=0x40221d58, op_array=0x40221b94)
at /root/src/php5-200402051830/Zend/zend_execute.c:2700
#9 0x0819b13f in execute (op_array=0x40221b94)
at /root/src/php5-200402051830/Zend/zend_execute.c:1272
#10 0x0817c13c in zend_execute_scripts (type=8, retval=0x0, file_count=3)
at /root/src/php5-200402051830/Zend/zend.c:1051
#11 0x08146585 in php_execute_script (primary_file=0xbffffc3c)
at /root/src/php5-200402051830/main/main.c:1641
#12 0x081bfba4 in main (argc=2, argv=0xbffffcc4)
at /root/src/php5-200402051830/sapi/cli/php_cli.c:941
#13 0x401083c1 in __libc_start_main () from /lib/libc.so.6
--
Edit bug report at http://bugs.php.net/?id=27165&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27165&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27165&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=27165&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=27165&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=27165&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=27165&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=27165&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=27165&r=support
Expected behavior: http://bugs.php.net/fix.php?id=27165&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=27165&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=27165&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=27165&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27165&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=27165&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=27165&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=27165&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=27165&r=float
