Apache Error Signal Segmentation Fault
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on your server can drive you crazy trying to solve it… So, I'm gonna explain you apache signal segmentation fault (11) how I figured out what was causing the last apache segfault apache exit signal segmentation fault I had. My server was running under Debian Squeeze, with Apache 2.2 and PHP 5.3, and I ah00051 child pid exit signal segmentation fault (11) possible coredump in /etc/apache2 got randomly segmentation faults: [Jun 08 17:38:07 2012] [notice] child pid 5646 exit signal Segmentation fault (11) [Jun 08 18:21:34 2012] [notice] child pid 8278 exit signal Segmentation
Apache Coredumpdirectory
fault (11) [Jun 08 18:44:59 2012] [notice] child pid 5665 exit signal Segmentation fault (11) 123 [Jun 08 17:38:07 2012] [notice] child pid 5646 exit signal Segmentation fault (11)[Jun 08 18:21:34 2012] [notice] child pid 8278 exit signal Segmentation fault (11)[Jun 08 18:44:59 2012] [notice] child pid 5665 exit signal Segmentation fault (11) I supposed the problem apache segmentation fault (core dumped) was on some php extension, so I deactivated some of them…but the problem was still there :( After spending a lot of time looking for what was causing it, I decided to debug apache with gdb. I installed it through backports because I needed an upper version than gdb 7.0 (7.0.1-2 is the current version on squeeze stable repository) otherwise I got this: "warning: The current binary is a PIE (Position Independent Executable), which GDB does NOT currently support. Most debugger features will fail if used in this session." when I was trying to debug apache: $ echo "deb http://backports.debian.org/debian-backports squeeze-backports main" >> /etc/apt/sources.list && apt-get update $ apt-get -t squeeze-backports install gdb 12 $ echo "deb http://backports.debian.org/debian-backports squeeze-backports main" >> /etc/apt/sources.list && apt-get update$ apt-get -t squeeze-backports install gdb Well, I had the debugger installed, but I also needed the php and apache debug symbols: $ apt-get install apache2-dbg php5-dbg 1 $ apt-get install apache2-dbg php5-dbg Once I had installed all I needed, I configured apache to crea
(11) If you have, read on. At my day job I deal with both Apache and PHP a lot. If you have ever tried to figure out why your PHP ah00052: child pid exit signal segmentation fault code seems to cause Apache segmentation faults, you probably experienced the same as
Apache 2.4 "segmentation Fault"
I did. Lots of pain, frustration and headaches. However all is not lost. There is a way to figure out
Httpd Notice Child Pid Exit Signal Segmentation Fault (11)
what PHP code is making Apache act crazy. I'll try to explain how to debug Apache using gdb to locate that nasty bug that is causing you to lose your precious beautysleep. http://sysadmin.carlusgg.com/?p=197 Before webegin Now, Apache does not dump core by default. We need to do some work before that happens. If you don't like to get your hands dirty compiling stuff manually, you should leave now, this is not foryou. Still here? Good! Before we start, make sure youhave: Root access to your webserver Apache source code and everything needed to (re-)compileApache PHP source code (or just http://www.omh.cc/blog/2008/mar/6/fixing-apache-segmentation-faults-caused-php/ download the .gbdinit file) Make Apache dumpcore The first step is to make Apache not change user when it starts up and forks, so we will make it run as root the whole time. To accomplish this we need to compile Apache with -DBIG_SECURITY_HOLE. For obvious reasons, this is not recommended forproduction. 1 2 3make clean export EXTRA_CFLAGS="-DBIG_SECURITY_HOLE" ./configure && make && make install Now specify the "root" as the "User" in httpd.conf. While we're editing httpd.conf we'll add a setting to specify where Apache should put our coredump. 1 2 3User nobody [...] CoreDumpDirectory /tmp/apache Make sure /tmp/apacheexists 1mkdir -p /tmp/apache On most systems the core file size is set to zero by default. We'll go ahead and change it tounlimited. 1ulimit -c 0 You can check your current core dump file size limit byrunning 1ulimit -a RestartApache 1apachectl restart Next time Apache crashes with a Segmentation fault it should make us a core dump. If you did everything correctly you should see something like this in the apacheerror_log. 1 2[notice] child pid 16430 exit signal Segmentation fault (11), possible coredump in /tmp/apache Note: For reasons unclear to me my dump file ende
Prev Next This bug is not in your last search results. Bug56984 - Random https://bz.apache.org/bugzilla/show_bug.cgi?id=56984 and frequent Segmentation fault (11) Summary: Random and frequent Segmentation fault http://serverfault.com/questions/473797/php-segmentation-fault-when-using-more-than-128m (11) Status: RESOLVED INVALID Product: Apache httpd-2 Classification: Unclassified Component: Platform Version: 2.4.7 Hardware: PC Linux Importance: P2 critical (vote) TargetMilestone: --- Assigned To: Apache HTTPD Bugs Mailing List URL: Keywords: Duplicates: 57846 (view as bug list) Depends on: Blocks: Show dependency tree segmentation fault Reported: 2014-09-15 13:47 UTC by victor_volpe Modified: 2015-04-22 18:59 UTC (History) CC List: 3 users (show) jkaluza katilthe ylavic.dev Attachments Add an attachment (proposed patch, testcase, etc.) Note You need to log in before you can comment on or make changes to this bug. Description victor_volpe 2014-09-15 13:47:36 UTC After I moved from 2.2 to signal segmentation fault 2.4 start the headaches. The crashes are random and occur very frequently. No hardware problem related, same behavior on an Cloud server. Same behavior with PHP 5.4.32 and 5.6.0. The crash occurs in any PHP script, with no warning/error in the logs. OS: FreeBSD 10.0-RELEASE-p7 amd64 error_log: [Sun Sep 14 22:15:20.114756 2014] [core:notice] [pid 80717:tid 34410095616] AH00052: child pid 81760 exit signal Segmentation fault (11) [Sun Sep 14 22:15:22.180905 2014] [core:notice] [pid 80717:tid 34410095616] AH00052: child pid 81727 exit signal Segmentation fault (11) [Sun Sep 14 22:27:14.973207 2014] [core:notice] [pid 80717:tid 34410095616] AH00052: child pid 81807 exit signal Segmentation fault (11) Apache 2.4.10 compile options: ./configure --prefix=/usr/apache --exec-prefix=/usr --sysconfdir=/etc/apache --enable-modules=none --enable-mods-static="authn_core authn_file authz_host authz_groupfile authz_user authz_core auth_basic socache_shmcb so include filter mime log_config env expires headers setenvif version ssl unixd status autoindex suexec cgi negotiation dir actions userdir alias rewrite" PHP 5.6.0 compile options: ./configure --prefix=/usr/php5 --exec-prefix=/usr --with-apxs2=/usr/bin/apxs --with-config-file-path=/etc --with-openssl --with-zlib --with-bz2 --with-curl --enable-ftp --with-gd --with-jpeg-dir --with-png-dir --with-zlib-dir --enable-mbstring --with-mcrypt --with-mssql --with-mysql --with-mysql-sock=/tmp/mysql.sock --with-mysqli=/usr/local/bin/mysql_config --ena
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top PHP segmentation fault when using more than 128M up vote 2 down vote favorite 1 I have an install of SugarCRM. It is heavy on memory, which is a separate issue to deal with. In the meantime, any page that attempts to use more than 128M of memory, results in the Apache (mod_php) process halting with a segmentation fault: [notice] child pid 6852 exit signal Segmentation fault (11) If I set the PHP memory limit to 128M, then I never get the signal 11; I just get the normal PHP error telling me it cannot allocate any more memory. If I set the PHP memory limit to greater than 128M - even slightly - then any process veering into that memory causes the segmentation fault and a white screen/broken connection for the user. I'm using PHP 5.3.21 on a CentOS 6.2 server with the Atomic repository. It is a production server, so there are no compilers present, so recompiling the Apache processes to do core dumps is not possible. We have APC 3.1.13 installed, and need that for some sites. It is (I believe) disabled for my SugarCRM site. I'm not sure what other details are needed to diagnose this? I'm hoping there are a few obvious things that I can look at, if someone here has encountered something similar. What is it about that 128M that causes the crash if memory usage exceeds it? Edit: The plot thickens. This test script runs, with 256M set as the memory_limit, until the PHP process runs out of memory at around 256M. It does not cause a segmentation fault; it runs and is terminated gracefully: