MantisBT

View Issue Details Jump to Notes ] Issue History ] Print ]
IDProjectCategoryView StatusDate SubmittedLast Update
0000154XdebugUsage problems (Wrong Results)public2005-10-14 18:582006-01-18 22:31
ReporterSiburNY 
Assigned To 
PrioritynormalSeveritycrashReproducibilityalways
StatusclosedResolutionopen 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0000154: Apache Segfault when xdebug.collect_params is ON
DescriptionWhen xdebug.collect_params is OFF, everything works like a charm. Once I turn it on, all php scripts (except one that execute phpinfo() only) stop working. In Apache error log I see errors "[notice] child pid XXXXX exit signal Segmentation fault (11)".

P.S. I'm using PHP 5.0.6-dev (latest CVS) and XDebug from CVS downloaded today (Oct 14 around 12:30PM -0500)
Additional InformationI used GDB to get more info. This full output with stacktrace:

-----------------------------------------------------------
Starting program: /usr/local/apache2/bin/httpd -X
[Thread debugging using libthread_db enabled]
[New Thread -1208039760 (LWP 23500)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208039760 (LWP 23500)]
0x002f2f7a in add_stack_frame (zdata=0xbfe65054, op_array=0x9935894, type=Variable "type" is not available.
)
    at /package/xdebug-2.0.0beta2/xdebug.c:965
965 tmp->var[tmp->varc].addr = *param;
(gdb) bt
#0 0x002f2f7a in add_stack_frame (zdata=0xbfe65054, op_array=0x9935894, type=Variable "type" is not available.
)
    at /package/xdebug-2.0.0beta2/xdebug.c:965
#1 0x002f32ce in xdebug_execute_internal (current_execute_data=0xbfe65054, return_value_used=0)
    at /package/xdebug-2.0.0beta2/xdebug.c:1273
0000002 0x00d66bad in zend_do_fcall_common_helper (execute_data=0xbfe65054, opline=0xb5dec9b0,
    op_array=0x9935894) at /package/php5-STABLE-200510121840/Zend/zend_execute.c:2763
0000003 0x00d73e2e in zend_do_fcall_handler (execute_data=0xbfe65054, opline=0xb5dec9b0,
    op_array=0x9935894) at /package/php5-STABLE-200510121840/Zend/zend_execute.c:2895
0000004 0x00d648f2 in execute (op_array=0x9935894)
    at /package/php5-STABLE-200510121840/Zend/zend_execute.c:1438
0000005 0x002f3624 in xdebug_execute (op_array=0x9935894)
    at /package/xdebug-2.0.0beta2/xdebug.c:1231
0000006 0x00d489d1 in zend_execute_scripts (type=8, retval=Variable "retval" is not available.
)
    at /package/php5-STABLE-200510121840/Zend/zend.c:1064
0000007 0x00d16fe2 in php_execute_script (primary_file=0xbfe673dc)
    at /package/php5-STABLE-200510121840/main/main.c:1643
0000008 0x00d79da6 in php_handler (r=0x98e5b58)
    at /package/php5-STABLE-200510121840/sapi/apache2handler/sapi_apache2.c:549
0000009 0x0807e0be in ap_run_handler (r=0x98e5b58) at config.c:152
0000010 0x0807e436 in ap_invoke_handler (r=0x98e5b58) at config.c:364
0000011 0x0806d5d9 in ap_process_request (r=0x98e5b58) at http_request.c:249
0000012 0x08069019 in ap_process_http_connection (c=0x98e1960) at http_core.c:251
0000013 0x0808798e in ap_run_process_connection (c=0x98e1960) at connection.c:43
0000014 0x0807c85e in child_main (child_num_arg=Variable "child_num_arg" is not available.
) at prefork.c:610
0000015 0x0807ca11 in make_child (s=0x9788800, slot=0) at prefork.c:650
0000016 0x0807cada in startup_children (number_to_start=1) at prefork.c:722
0000017 0x0807d29c in ap_mpm_run (_pconf=0x97840a8, plog=0x97bc188, s=0x9788800) at prefork.c:941
0000018 0x0808256f in main (argc=2, argv=0xbfe677e4) at main.c:618
-----------------------------------------------------------

If you need more info, I'd be more than happy to provide it :).
TagsNo tags attached.
Operating System
PHP Version5.0.5
Attached Files

- Relationships
has duplicate 0000165resolvedderick xdebug.collect_params only produces "???" in php 5.1.x 

-  Notes
(0000299)
derick (administrator)
2005-10-19 10:21

Hello,

I just committed a "fix" to CVS, can you please verify that this stops the crash itself? (The parameters will be shown as "???" though, I do need to look into this a bit better).

Derick
(0000301)
SiburNY (reporter)
2005-10-19 21:04

Yes, I tested it and it's not segfaulting and all parameters are "???" :)
(0000316)
derick (administrator)
2005-12-30 14:39

I think I figured out what is causing this - it might be GCC's over optimizating something. Which GCC version do you use (gcc --version) and does it work if you remove the "-O2" from the Makefile before compiling?
(0000326)
SiburNY (reporter)
2005-12-30 21:45

I will recompile it today. Thank you.
(0000332)
derick (administrator)
2006-01-17 21:15

Does it work now?
(0000347)
judas_iscariote (reporter)
2006-01-17 23:29

I can confirm this problem it a gcc over-optimization issue.
removing "-O2" and debug.collect_params works perfectly

gcc --version
gcc (GCC) 4.0.2 20050901 (prerelease) (SUSE Linux)

(vendor provided GCC)
(0000350)
SiburNY (reporter)
2006-01-18 20:34

Everything works like a charm now :) Thanks!

--------------------------------------------------------------------------------
# gcc --version
gcc (GCC) 4.0.2 20051007 (Red Hat 4.0.2-3)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
--------------------------------------------------------------------------------
(0000351)
derick (administrator)
2006-01-18 22:31

In CVS I now remove the -O2 for this extension, so all should be well even without hacking the Makefile yourself. Thanks for testing it!

- Issue History
Date Modified Username Field Change
2005-10-14 18:58 SiburNY New Issue
2005-10-19 10:21 derick Xdebug Version 2.0-dev => 2.0.0beta5-dev
2005-10-19 10:21 derick Note Added: 0000299
2005-10-19 21:04 SiburNY Note Added: 0000301
2005-12-30 14:39 derick Note Added: 0000316
2005-12-30 14:39 derick Status new => feedback
2005-12-30 21:45 SiburNY Note Added: 0000326
2006-01-17 21:15 derick PHP Version 5.0.4 => 5.0.5
2006-01-17 21:15 derick Xdebug Version 2.0.0beta5-dev => 2.0.0beta2
2006-01-17 21:15 derick Note Added: 0000332
2006-01-17 23:22 derick Relationship added has duplicate 0000165
2006-01-17 23:29 judas_iscariote Note Added: 0000347
2006-01-18 20:34 SiburNY Note Added: 0000350
2006-01-18 22:31 derick Status feedback => closed
2006-01-18 22:31 derick Note Added: 0000351
2016-07-31 13:36 derick Category Usage problems => Usage problems (Crashes)
2016-07-31 13:38 derick Category Usage problems (Crashes) => Usage problems (Wrong Results)


Copyright © 2000 - 2017 MantisBT Team
Powered by Mantis Bugtracker