Apache CentOS Crash - Core Dump Analysis And Backtrace

Nov 30, 2013

I've been seeing lots of the following error in my error_log recently, I've enabled core dumps and have managed to analyse one using gdb:

[Fri Nov 29 20:44:41.318847 2013] [core:notice] [pid 2307] AH00051: child pid 7504 exit signal Segmentation fault (11), possible coredump in /tmp/core-dump[Fri Nov 29 20:44:41.318937 2013] [core:notice] [pid 2307] AH00051: child pid 7623 exit signal Segmentation fault (11), possible coredump in /tmp/core-dump[Fri Nov 29 20:44:43.324859 2013] [core:notice] [pid 2307] AH00051: child pid 7724 exit signal Segmentation fault (11), possible coredump in /tmp/core-dump

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Apache :: How To Create Dump File For Crash In Windows

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how to create Dump File for Apache Crash in Windows.We are using Apache for Reverse Proxy with OpenAM Module for Sign-in.Apache Version : are very frequently facing Apache Crash Issue.

Also in logs we do not get much information.when submitted logs to ForgeRock, they asked us to look into below error and provide Crash Dump.

[Sun Jun 15 23:00:10.153908 2014] [mpm_winnt:warn] [pid 2376:tid 424] (OS 64)The specified network name is no longer available. : AH00341: winnt_accept: Asynchronous AcceptEx failed.
[Sun Jun 15 23:02:21.609557 2014] [proxy_http:error] [pid 2376:tid 6544] (OS 10060)A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. : [client 10.XXX.XX.XX:XXXX] AH01095: prefetch request body failed to XX.XXX.XX.XX:XXX (teampark.sogeti.com) from XX.XXX.XX.XX (), referer: https://teampark.sogeti.com/blogs/roller-ui/authoring/weblog.do?method=create&weblog=VeckobrevIntegrationSyd&lang=sv_se

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Unable to rotate dump: The dump rotation is failed with code '121' at /usr/local/psa/admin/bin/plesk_agent_manager line 1041.

I read here [URL] .... that it should be solved but I have the version 12.0.18 Update #33, why does it persist?

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processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz
stepping : 7
cpu MHz : 1998.000
cache size : 2048 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni monitor ds_cpl est tm2 cx16 xtpr lahf_lm
bogomips : 4668.98

it shows all 4 cores but look at the MHZ, is there something i can do about this to fix this?

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i have the following server specs :-

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i have some sites vb forums / proxy sites / file hosting site / tube sites , all together some 10-12K visitors a day , i am using xcache , but still apache is crashing many times ,what should i do , i have asked platinum server management guys, they disable logs , suexec but still no luck, will increase of another 2gb of ram help me?

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Jul 8, 2008

The Apache service is getting crash and creaing following logs

[Mon Jul 07 23:52:21 2008] [notice] child pid 12878 exit signal Segmentation fault (11)
[Mon Jul 07 23:52:21 2008] [notice] child pid 12881 exit signal Segmentation fault (11)
[Mon Jul 07 23:52:21 2008] [notice] child pid 12886 exit signal Segmentation fault (11)
[Mon Jul 07 23:52:22 2008] [notice] child pid 12859 exit signal Segmentation fault (11)
[Mon Jul 07 23:52:23 2008] [notice] child pid 12904 exit signal Segmentation fault (11)
[Mon Jul 07 23:52:23 2008] [notice] child pid 12909 exit signal Segmentation fault (11)
[Mon Jul 07 23:52:25 2008] [notice] child pid 12877 exit signal Segmentation fault (11)

Server Specification.

Apache : 2.0.52
PHP : PHP 5.2.5
MySQL : 5.0.51


KeepAlive Off
MaxKeepAliveRequests 50
KeepAliveTimeout 10
StartServers 16
MinSpareServers 8
MaxSpareServers 64
ServerLimit 1000
MaxClients 500
MaxRequestsPerChild 5000
ServerSignature On

my.cnf (Seprate box with 2GB RAM)

log-slow-queries = /var/log/mysql/mysql-slow.log
max_connections = 800
max_user_connections = 800
key_buffer = 36M
key_buffer_size = 64M
myisam_sort_buffer_size = 64M
join_buffer_size = 2M
read_buffer_size = 2M
sort_buffer_size = 3M
thread_stack = 128K
table_cache = 1024
thread_cache_size = 286
interactive_timeout = 25
wait_timeout = 1800
connect_timeout = 10
max_allowed_packet = 16M
max_connect_errors = 999999
query_cache_limit = 8M
query_cache_size = 64M
query_cache_type = 1
tmp_table_size = 16M
max_allowed_packet = 16M
key_buffer = 16M

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i do not download or upload any files to there,

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The Apache server on one of my box crashed last night and the log file simply states:
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lrwxrwxrwx 1 root root 25 Mar 9 23:51 build;45f23959 -> ../../usr/lib/httpd/build
lrwxrwxrwx 1 root root 19 Mar 9 23:51 logs;45f23959 -> ../../var/log/httpd

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Has anyone seen similar things like this? What could be the root cause?

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Template_Exception: Can not restart web server:
file: /usr/local/psa/admin/plib/Service/Driver/Web/Server/Apache.php
line: 104
code: 0

We then run "bootstrapper.sh repair" to get Apache back online. But can't create any new sub domains, without the same issue occuring. With each server, 1and1 raise a ticket with Parallels, who log in and fix the issue. But then Following the Parallels fix, the server runs slowly, sometime throwing up 502 errors etc, which nobody is able to fix, and again, we have to move servers.We have just hit exactly the same issue on our 3rd and final 1and1 server.

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Jul 27, 2008

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I have tried installing Ubuntu as a fully virtualized guest, but the Ubuntu CD doesn't even bootup. I get the Linux bootloader, and that's it,it doesn't continue to boot. Odd.

When trying to install a Paravirtualized guest, I had to use the debootstrap method, but can't get it to boot up.


xm create anya_zanet
Using config file "/etc/xen/anya_zanet".
Error: (2, 'Invalid kernel', 'xc_dom_find_loader: no loader found

This is the xen configuration:

kernel = "/boot/vmlinuz-"
ramdisk = "/boot/initrd-"
memory = 256
name = "anya_zanet"
vcpus = 1
vif = [ 'bridge=xenbr0' ]
disk = [ 'phy:/dev/System/anya_zanet,hda1,w' , 'phy:/dev/System/anya_zanet,hda2,w' ]
root = "/dev/hda1 ro"
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'

how to get Ubuntu working on a CentOS / Fedora Core XEN server?

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May 16, 2007

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I downloaded and installed SmarterStats to evaluate it. It seems to have only analyzed the first few days of the one-year's worth of log files. I couldn't find a number to call, and I couldn't get into their forum, so I decided I don't like them.

Webalizer seems to be just for *nix systems. This company is Windows based.

I need very basic information. Visitor sessions, popular pages, and, if possible, how many people clicked on an ad.

Also, the logs already exist. They just need to be analyzed. A solution that wants me to add something to my code might be appropriate going forward, but I need something that can read my existing log files.

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Jul 11, 2008

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I will be providing an in-depth ongoing analysis of my experiences with them for the benefit of the WebHostingTalk community.

I signed up for the "Windows-EZ VPS Value" package.
RAM: 768MB (a great vlaue)
Transfer: 300 GB
Price: $29/month
( with 50% off first month coupon my total was $14.50 )

After completing the sign-up process, I checked my email and noticed I had received 6 automated e-mails from them during the process

The order was placed at 9:46am.
They e-mailed me that my VPS was created at 10:10am (nice)
The followup e-mail with my server information arrived at 10:20am. For a total of 34 minutes from sign-up to server access. So far I am very happy.

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I don't think Mosso is ready for prime time. The marketing on their site is beautiful. When a friend recommended it (an entrepreneur like me), coupled with all the promises on their marketing pages, plus the pricing, I thought moving my service to Mosso was a no-brainer.

First of all, kudos to them for having a user forum. I firmly believe this is the right way to go. Unfortunately it also confirmed my experience was not unique. On the day I signed up, the control panel was not responsive. It took a long time and several attempts to load. The user forum also points to almost daily downtime, though granted for only a few minutes in most cases (via the pingdom links provided).

The forums are currently password protected, but a Mosso employee said this is accessible via a demo account. I suggest you review the forums before signing up with Mosso, it would have saved me time and effort.

In short -

1. The service doesn't provide the uptime suggested by their marketing pages.

2. Initial review suggests the software needs security updates. I emailed them my findings, hopefully it helps them. No response after 2 days. I'm keeping this vague intentionally.

3. The cancellation of an account was a mini-AOL-like experience. You can't cancel via the admin console. Turns out you cancel via email. What kills me most about this is the lack of understanding of security. They want me to email them my account's username and password. Since I'm human, I only have 2-3 passwords for all my accounts (banking, registar, etc.). And for me to email them my password is not appropriate at best. I had to use the "forget password" function to create a new one so I could email it to them.

4. I really think they over promise on their marketing. I think they should label it as a "beta" product to better reflect its status. The parent company has a great reputation, and I've used them in the past, hopefully they'll better protect their reputation by more openly reflecting Mosso's status. How can they have an enterprise level system with almost daily downtime?

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### Proxy Setup ####

ProxyVia On
ProxyPass /console http://<apps-host>:8980/console

<Location /console>
ProxyPassReverse http://<apps-host>:8980/console

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Checked the Error Logs it shows -

[Mon May 27 14:09:24 2013] [notice] child pid 29964 exit signal Segmentation fault (11)
[Mon May 27 14:09:32 2013] [notice] child pid 29963 exit signal Segmentation fault (11)
[Mon May 27 14:11:14 2013] [notice] caught SIGTERM, shutting down
[Mon May 27 14:11:19 2013] [warn] RSA server certificate CommonName (CN) `BUNTY RAY' does NOT match server name!?
[Mon May 27 14:11:19 2013] [warn] No JkLogFile defined in httpd.conf. Using default /opt/apache-2.2.24/logs/mod_jk.log


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