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Bug#449027: vserver: [notice] child pid 27907 exit signal Segmentation fault (11)

From: Gerhard GauÃŸling <ggrubbish(at)web.de>
Date: Sat Nov 10 2007 - 09:56:47 EST

Hello,

I don't want to spam this bug report with logs, although I don't know what's going wrong.
I'm not able to get a coredump again, and gdb crashes all the time.

Therefore I come again with this huge report, I'm sorry:

# uname -a

Linux pv10.ncsrv.de 2.6.9-023stab044.11-smp #1 SMP Sat Sep 29 13:36:25 MSD 2007 i686 GNU/Linux

# apt-cache policy gdb

gdb:
Installed: 6.4.90.dfsg-1

# apt-cache policy apache-dbg

apache-dbg:
Installed: 1.3.34-4.1

# apt-cache policy libc6-dbg

libc6-dbg:
Installed: 2.3.6.ds1-13etch2

|---------------------------------------------------------------

# egrep '(CoreDump|Core\ Dump)' -A10 /etc/apache/httpd.conf
#Enable Core Dumps
#http://issues.apache.org/bugzilla/show_bug.cgi?id=30909
#http://httpd.apache.org/dev/debugging.html#gcore
#http://library.pantek.com/Mailing%20Lists/httpd.apache.org/bugs/03/12/11117.html
#http://www.wikiservice.at/dse/wiki.cgi?MarkusRechberger/C/CoreDump

CoreDumpDirectory /tmp
|-^^^^^^^^^^^^^^^^^^^^^^

#EnableExceptionHook controls whether or not an exception hook
implemented by a module will be called after a child process crash. The exception hook allows modules to log diagnostic information that may help determine the cause of the crash.
#http://httpd.apache.org/docs/1.3/mod/core.html#enableexceptionhook
#http://www.linuxserverforum.de/vb/archive/index.php/t-781.html

Do you need help?

<IfModule mod_backtrace.c>
EnableExceptionHook On
</IfModule>

|---------------------------------------------------------------

# ls -l /var/tmp /var/tmp_safe/ /tmp /|grep core

-rw-------    1 root root  3928064 2007-10-02 12:27 core.13649
-rw-------    1 root root  3928064 2007-10-02 12:28 core.16058
-rw-------    1 root root  3928064 2007-10-02 12:29 core.17953
-rw-------    1 root root  3928064 2007-10-02 12:30 core.20073
-rw-------    1 root root  3928064 2007-10-02 12:31 core.23832
-rw-------    1 root root  3928064 2007-10-02 12:36 core.8024

# ls -ld /var/tmp /var/tmp_safe/ /tmp /          

drwxr-xr-x 20 root root 1024 2007-11-09 14:09 /
drwxrwxrwt  5 root root 6144 2007-11-10 15:50 /tmp

drwxrwxrwt 3 root root 1024 2007-09-18 20:14 /var/tmp drwxr-xr-x 2 root root 1024 2007-03-29 05:27 /var/tmp_safe/

|---------------------------------------------------------------

# cat /etc/apache/modules.conf
# Autogenerated file - do not edit!
# This file is maintained by the apache package.
# To update it, run the command:
# /usr/sbin/apache-modconf apache

ClearModuleList
AddModule mod_so.c
AddModule mod_macro.c
LoadModule config_log_module /usr/lib/apache/1.3/mod_log_config.so LoadModule agent_log_module /usr/lib/apache/1.3/mod_log_agent.so LoadModule referer_log_module /usr/lib/apache/1.3/mod_log_referer.so LoadModule log_forensic_module /usr/lib/apache/1.3/mod_log_forensic.so LoadModule mime_magic_module /usr/lib/apache/1.3/mod_mime_magic.so LoadModule mime_module /usr/lib/apache/1.3/mod_mime.so LoadModule status_module /usr/lib/apache/1.3/mod_status.so LoadModule info_module /usr/lib/apache/1.3/mod_info.so LoadModule dir_module /usr/lib/apache/1.3/mod_dir.so LoadModule alias_module /usr/lib/apache/1.3/mod_alias.so LoadModule rewrite_module /usr/lib/apache/1.3/mod_rewrite.so LoadModule access_module /usr/lib/apache/1.3/mod_access.so

LoadModule auth_module /usr/lib/apache/1.3/mod_auth.so
LoadModule setenvif_module /usr/lib/apache/1.3/mod_setenvif.so
LoadModule php5_module /usr/lib/apache/1.3/libphp5.so

LoadModule backtrace_module /usr/lib/apache/1.3/mod_backtrace.so LoadModule whatkilledus_module /usr/lib/apache/1.3/mod_whatkilledus.so

LoadModule prctl_module /usr/lib/apache/1.3/mod_prctl.so
|---------------------------------------------------------------^^^^^^^^^^^^^


|------------------------------------------------------------------------------------------------------------

# lynx --dump localhost/server-info

                                                          Apache Server

Information

Server Settings, mod_prctl.c, mod_whatkilledus.c, mod_backtrace.c, mod_php5.c, mod_setenvif.c, mod_auth.c, mod_access.c, mod_rewrite.c,

mod_alias.c, mod_dir.c, mod_info.c, mod_status.c, mod_mime.c, mod_mime_magic.c, mod_log_forensic.c, mod_log_referer.c, mod_log_agent.c,

mod_log_config.c, mod_macro.c, mod_so.c, http_core.c

   Server Version: Apache/1.3.34 (Debian)    Server Built: Mar 4 2007 01:34:14
   API Version: 19990320:18
   Run Mode: standalone
   User/Group: www-data(33)/33
   Hostname/port: xxx.xxx.xxx.xxx:80
   Daemons: start: 1 min idle: 1 max idle: 2 max: 20    Max Requests: per child: 4000 keep alive: on max per connection: 80

   Threads: per child: 0
   Excess requests: per child: 0
   Timeouts: connection: 300 keep-alive: 15    Server Root: /etc/apache
   Config File: /etc/apache/httpd.conf
   PID File: /var/run/apache.pid
   Scoreboard File: /var/run/apache.scoreboard

   Module Name: mod_prctl.c
   Content handlers: none
   Configuration Phase Participation: Child Init    Request Phase Participation: none
   Module Directives: none

   Module Name: mod_whatkilledus.c
   Content handlers: none
   Configuration Phase Participation: none    Request Phase Participation: Post-Read Request    Module Directives:

Do you need more help?

WhatKilledUsLog - the fully-qualified filename of the mod_whatkilledus logfile

Current Configuration:

   Module Name: mod_backtrace.c
   Content handlers: none
   Configuration Phase Participation: none    Request Phase Participation: none
   Module Directives:

BacktraceLog - the fully-qualified filename of the mod_backtrace logfile

Current Configuration:

Module Name: mod_php5.c
Content handlers: application/x-httpd-php , application/x-httpd-php-source , text/html

Configuration Phase Participation: Create Directory Config, Merge Directory Configs, Child Exit

Request Phase Participation: none
Module Directives:

          php_value - PHP Value Modifier
          php_flag - PHP Flag Modifier
          php_admin_value - PHP Value Modifier (Admin)
          php_admin_flag - PHP Flag Modifier (Admin)
          PHPINIDir - Directory containing the php.ini file

   Current Configuration:
         
___________________________________________________________________________________________________________________________

|-------------------------------------------------------------------------------------------------------------

Can we help you?

Unfortunately there is no line like this: [Mon Sep 05 13:35:39 2005] [notice] child pid 2027 exit signal Segmentation fault (11), possible coredump in /tmp

instead I get this, no core dump produced: pid 22064 mod_backtrace backtrace for signal 11

see:
http://httpd.apache.org/dev/debugging.html#crashes http://www.unixadmintalk.com/f44/apache-not-generating-core-files-36196/

# tail -f /var/log/apache/error.log

[Sat Nov 10 15:37:19 2007] [info] created shared memory segment #294912 [Sat Nov 10 15:37:19 2007] [notice] Apache/1.3.34 (Debian) configured -- resuming normal operations
[Sat Nov 10 15:37:19 2007] [info] Server built: Mar 4 2007 01:34:14 [Sat Nov 10 15:37:19 2007] [notice] Accept mutex: sysvsem (Default: sysvsem)
[Sat Nov 10 15:38:04 2007] pid 22351 mod_backtrace backtrace for signal 11
[Sat Nov 10 15:38:04 2007] pid 22351 mod_backtrace main() is at 8061680 /usr/lib/apache/1.3/mod_backtrace.so[0xb77c8b85] apache.dbg[0x805deb6]

/lib/tls/libpthread.so.0[0xb7fb5668]
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/lib/ld-linux.so.2[0xb7ff2b07]
/lib/ld-linux.so.2[0xb7ff62f9]
/lib/ld-linux.so.2[0xb7ff6090]
/lib/tls/librt.so.1[0xb73766e7]
/lib/ld-linux.so.2[0xb7ff6ede]
/lib/tls/libc.so.6(exit+0xd0)[0xb7d554f0]
apache.dbg[0x805d51a]
apache.dbg[0x805f746]
apache.dbg[0x805fe46]