[xdebug-dev] Bug 0000085: Segmentation fault

The following bug has been CLOSED
======================================================================
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000085
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Reporter: emgie
Handler:
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Project: Xdebug
Bug ID: 85
Category: Usage problems
Reproducibility: always
Severity: minor
Priority: normal
Status: closed
Operating System: Fedora Core 1
PHP Version: 5.0.0-dev
Xdebug Version: 2.0-dev
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Date Submitted: 2004-08-04 10:28 CEST
Last Modified: 2004-08-05 13:12 CEST
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Summary: Segmentation fault
Description:
Every time I run php with XDebug extension, it finishes with segmentation
fault, having executed every script or just version request (-v)
correctly.
======================================================================

----------------------------------------------------------------------
 emgie - 2004-08-04 10:30 CEST
----------------------------------------------------------------------
Here is the gdb log:

[root[@]floyd bin]# gdb php
GNU gdb Red Hat Linux (5.3.90-0.20030710.41rh)
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "i386-redhat-linux-gnu"...Using host
libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) run -v
Starting program: /usr/local/bin/php -v
[Thread debugging using libthread_db enabled]
[New Thread -1084790912 (LWP 16385)]
PHP 5.0.0 (cli) (built: Jul 20 2004 11:59:59)
Copyright (c) 1997-2004 The PHP Group
Zend Engine v2.0.0, Copyright (c) 1998-2004 Zend Technologies
    with Xdebug v2.0.0dev, Copyright (c) 2002, 2003, 2004, by Derick
Rethans

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1084790912 (LWP 16385)]
0x007612f2 in _int_free () from /lib/tls/libc.so.6
(gdb) bt
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000000 0x007612f2 in _int_free () from /lib/tls/libc.so.6
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000001 0x0076028b in free () from /lib/tls/libc.so.6
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000002 0x001e2005 in zm_post_zend_deactivate_xdebug ()
    at /home/maciek/nowe/xdebug2/xdebug/xdebug.c:566
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000003 0x08206796 in exec_done_cb (module=0x94f98)
    at /home/maciek/nowe/php-5.0.0/Zend/zend.c:834
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000004 0x0820c365 in zend_hash_apply (ht=0x1f1fad,
    apply_func=0x8206780 <exec_done_cb>)
    at /home/maciek/nowe/php-5.0.0/Zend/zend_hash.c:664
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000005 0x082067bd in zend_post_deactivate_modules ()
    at /home/maciek/nowe/php-5.0.0/Zend/zend.c:842
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000006 0x081d46be in php_request_shutdown (dummy=0x0)
    at /home/maciek/nowe/php-5.0.0/main/main.c:1215
http://bugs.xdebug.org/bug_view_page.php?bug_id=0000007 0x08232c93 in main (argc=2, argv=0xbfe8db84)
    at /home/maciek/nowe/php-5.0.0/sapi/cli/php_cli.c:1046
(gdb)

----------------------------------------------------------------------
 derick - 2004-08-04 10:50 CEST
----------------------------------------------------------------------
Valgrind output:

==27885== Invalid free() / delete / delete[]
==27885== at 0x3C01F918: free (vg_replace_malloc.c:127)
==27885== by 0x3C88B4CB: zm_post_zend_deactivate_xdebug (xdebug.c:566)
==27885== by 0x82D7033: exec_done_cb (zend.c:834)
==27885== by 0x82DF86D: zend_hash_apply (zend_hash.c:664)
==27885== Address 0x3C89E67E is not stack'd, malloc'd or free'd

(If you want a workaround, just comment out that line 566 and it should
work).

----------------------------------------------------------------------
 emgie - 2004-08-04 11:41 CEST
----------------------------------------------------------------------
Actually, setting "xdebug.idekey" to anything makes a better solution.
(this option is not documented)

Seems that there should be more care taken of "ide_key" variable in the
code.

----------------------------------------------------------------------
 derick - 2004-08-05 13:12 CEST
----------------------------------------------------------------------
This is fixed in CVS now, we had a problem where we used two different
styles of memory allocation functions.
The idekey setting is now also documented.

Bug History
Date Modified Username Field Change
======================================================================
2004-08-04 10:28emgie New Bug
2004-08-04 10:30emgie Bugnote Added: 0000171
2004-08-04 10:50derick Bugnote Added: 0000172
2004-08-04 10:50derick Status new => confirmed
2004-08-04 11:41emgie Bugnote Added: 0000173
2004-08-05 13:12derick Bugnote Added: 0000174
2004-08-05 13:12derick Status confirmed => closed
======================================================================
Received on Thu Aug 05 2004 - 13:12:26 BST