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John Hayward

1.8 server child exit Segmentation Falt

After installing the 9-20 version of 1.8 I observe when browsing to various applications (admin, calendar etc) having the browser come back asking me what I want to do with a php file. In looking at the apache2..2.14 log I see:
====
[Thu Sep 23 07:49:38 2010] [notice] child pid 23180 exit signal Segmentation fault (11)
[Thu Sep 23 07:49:39 2010] [notice] child pid 23179 exit signal Segmentation fault (11)
[Thu Sep 23 07:49:54 2010] [notice] child pid 23181 exit signal Segmentation fault (11)
[Thu Sep 23 07:49:55 2010] [notice] child pid 23182 exit signal Segmentation fault (11)
[Thu Sep 23 07:49:55 2010] [notice] child pid 23184 exit signal Segmentation fault (11)
====

I have not seen this problem with 1.6.
I have seen this on two different virtual servers (xen).

I do have the issue with JPGraph when running the setup check installation.
Enviornment:
Ubuntu 10.04.1 LTS
PHP/5.3.2-1ubuntu4.5

Anyone seen this?
Any suggestions on how to fix?

johnh...

NoBody

Re: 1.8 server child exit Segmentation Falt

Yes, I have seen this.

Infact, I'm currently seeing this happen, with the exact same errormessages (segmentation faults in apache) when trying to open some eGW-modules, for example Timesheet or Filemanager..

Running a fresh installation of Ubuntu Server 10.04 with current latest versions of Apache2, PHP5(.3.3) and MySQL5, from the default aptitude-repositories. Installed eGW fresh from the opensuse.org-repository for my Ubuntu-version..

So, to reproduce, my guess would be to 'just' install Ubuntu 10.04 on some (virtual) PC (although the problem still seems to exist with 10.10, from what I understood whilst googling this), install default AMP and default eGW. Then just try to open one of those modules.

Too bad no-one has responded yet to this thread. A solution for this would be nice ;-)

Hans-Jürgen Tappe

Re: 1.8 server child exit Segmentation Falt

Am 04.02.2011 04:06, schrieb NoBody:
> Too bad no-one has responded yet to this thread. A solution for this would
> be nice ;-)

PHP 5.3 is broken. A lot of threads address this, including instructions
for downgrade to PHP 5.2. Just search.

Regards,
Hans-Jürgen

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Robert Steinmetz AIA

Re: 1.8 server child exit Segmentation Falt

In reply to this post by John Hayward

John Hayward wrote:

After installing the 9-20 version of 1.8 I observe when browsing to various
applications (admin, calendar etc) having the browser come back asking me
what I want to do with a php file.  In looking at the apache2..2.14 log I
see:
====
[Thu Sep 23 07:49:38 2010] [notice] child pid 23180 exit signal Segmentation
fault (11)
[Thu Sep 23 07:49:39 2010] [notice] child pid 23179 exit signal Segmentation
fault (11)
[Thu Sep 23 07:49:54 2010] [notice] child pid 23181 exit signal Segmentation
fault (11)
[Thu Sep 23 07:49:55 2010] [notice] child pid 23182 exit signal Segmentation
fault (11)
[Thu Sep 23 07:49:55 2010] [notice] child pid 23184 exit signal Segmentation
fault (11)
====

I have not seen this problem with 1.6.
I have seen this on two different virtual servers (xen).

I do have the issue with JPGraph when running the setup check installation.
Enviornment:
Ubuntu 10.04.1 LTS
PHP/5.3.2-1ubuntu4.5 

Anyone seen this?
Any suggestions on how to fix?

johnh...

I am currently running Ubuntu 10.04 with stock Ubuntu php modules. I found that in my case segmentation faults were the result of php attempting load more than one php accelerator. Remove xcache and apc (if installed) or disable any similar caching you may have installed.and see if that helps.

Let us know what happens

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NoBody

Re: 1.8 server child exit Segmentation Falt

Removing APC did the trick for me. Apparently it's installed by default by Ubuntu Server 10.04.

Thanks for that tip :)

Robert Steinmetz AIA

Re: 1.8 server child exit Segmentation Falt

You're welcome. Do you have xcache installed? The package is called php5-xcache

Both apc and scache were installed on my much upgraded system.

I found that I could have one or the other but not both.

NoBody wrote:

Removing APC did the trick for me. Apparently it's installed by default by
Ubuntu Server 10.04.

Thanks for that tip :)

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NoBody

RE: 1.8 server child exit Segmentation Falt

Nope, APC was the only one installed; xcache wasn't. So there's either a 3rd accelerator playing along, or APC on it's own makes eGroupWare quit as well.

It's however working fine now and since it doesn't require the best performance, I'm fine with it :)

Date: Mon, 21 Feb 2011 07:47:18 -0800
From: [hidden email]
To: [hidden email]
Subject: Re: 1.8 server child exit Segmentation Falt

You're welcome. Do you have xcache installed? The package is called php5-xcache

Both apc and scache were installed on my much upgraded system.

I found that I could have one or the other but not both.

NoBody wrote:

Removing APC did the trick for me. Apparently it's installed by default by
Ubuntu Server 10.04.

Thanks for that tip :)

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Robert Steinmetz AIA

Re: 1.8 server child exit Segmentation Falt

Thanks for responding.
I've been trying to see if I can determine what causes this problem. It's obviously a bug in php, and other applications have been reported to trigger it.

You are the second person that reported apc alone causing problems. I find it odd that in my mostly stock 10.04 I can use either xcache or apc but not both. Obviously something else is going on.
You might want to try Xcache to see if it works for you. I it's performance is reportedly similar to apc.
The only other similar php accelerator I know of is eAccelerator which does not appear to be in the Ubuntu repositories. I understand that the Zend Server also incorporates caching.

NoBody wrote:

Nope, APC was the only one installed; xcache wasn't. So there's either a 3rd accelerator playing along, or APC on it's own makes eGroupWare quit as well.

It's however working fine now and since it doesn't require the best performance, I'm fine with it :)

Date: Mon, 21 Feb 2011 07:47:18 -0800
From: [hidden email]
To: [hidden email]
Subject: Re: 1.8 server child exit Segmentation Falt

You're welcome. Do you have xcache installed? The package is called php5-xcache

Both apc and scache were installed on my much upgraded system.

I found that I could have one or the other but not both.

NoBody wrote:
Removing APC did the trick for me. Apparently it's installed by default by
Ubuntu Server 10.04.

Thanks for that tip :)
  
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Xenopus

Re: 1.8 server child exit Segmentation Falt

Robert Steinmetz AIA wrote

You are the second person that reported apc alone causing problems. I find it odd that in my mostly stock 10.04 I can use either xcache or apc but not both. Obviously something else is going on.

There is more going on.
The segfaults were so severe on my stock 10.10 that it was impractical to use version 1.8 so I had to go back to 1.6. Removing all php caching improved things but was still not acceptable.
Then I saw this post and decided to disable the deflate module in apache. Lo! No more segfaults. I am now running server 1.8 on 64 bit Ubuntu 10.10 with php-5.3.5 and php-apc, have been fiddling with all applications for a few hours and all is well.
Confirm, anyone?

jqueiroz

Re: 1.8 server child exit Segmentation Falt

I'm having the same problem, Ubuntu server 10.04 32bits, PHP 5.3.2 from repository, eGroupware 1.8 from OpenSuse Deb repository.

Tried the solutions proposed here, nothing worked:

- uninstalled php-apc; no other chaching module installed (afaik).
- also tried installing php5-xcache, no result;
- disabled mod_deflate, still doesn't resolved the SEGV. But when this module is disabled, the output of the request is shown correctly, dispite the final SEGV error.

I'm accepting suggestions.

Robert Steinmetz AIA

Re: 1.8 server child exit Segmentation Falt

The variety of errors seems to point to system specific configuration issues triggering the underlying bugs. Some people seem to be able to resolve their issues but others using the same solution continue to have problems. My x86 (32 bit) system has been upgraded several times both hardware and software so I can't say it is equivalent to a new clean install. I am using apache2, PHP 5.3.2-1ubuntu4.7 with Suhosin-Patch and egroupware from the SUSE repository. I have apc installed (I removed xcache) and as far as I can tell it works as expected.

I'd be happy to provide any information from my system to assist others to compare their configuration.

jqueiroz wrote:

I'm having the same problem, Ubuntu server 10.04 32bits, PHP 5.3.2 from
repository, eGroupware 1.8 from OpenSuse Deb repository.

Tried the solutions proposed here, nothing worked:

- uninstalled php-apc; no other chaching module installed (afaik).
- also tried installing php5-xcache, no result;
- disabled mod_deflate, still doesn't resolved the SEGV. But when this
module is disabled, the output of the request is shown correctly, dispite
the final SEGV error.

I'm accepting suggestions.

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NoBody

RE: 1.8 server child exit Segmentation Falt

Perhaps that's the thing that makes the difference. I'm using eGW from the SuSE-repository too, instead of having it manually installed somewhere in /var/www/.

How did you guys install eGW?

Date: Wed, 23 Feb 2011 13:26:07 -0800
From: [hidden email]
To: [hidden email]
Subject: Re: 1.8 server child exit Segmentation Falt

The variety of errors seems to point to system specific configuration issues triggering the underlying bugs. Some people seem to be able to resolve their issues but others using the same solution continue to have problems. My x86 (32 bit) system has been upgraded several times both hardware and software so I can't say it is equivalent to a new clean install. I am using apache2, PHP 5.3.2-1ubuntu4.7 with Suhosin-Patch and egroupware from the SUSE repository. I have apc installed (I removed xcache) and as far as I can tell it works as expected.

I'd be happy to provide any information from my system to assist others to compare their configuration.

jqueiroz wrote:

I'm having the same problem, Ubuntu server 10.04 32bits, PHP 5.3.2 from
repository, eGroupware 1.8 from OpenSuse Deb repository.

Tried the solutions proposed here, nothing worked:

- uninstalled php-apc; no other chaching module installed (afaik).
- also tried installing php5-xcache, no result;
- disabled mod_deflate, still doesn't resolved the SEGV. But when this
module is disabled, the output of the request is shown correctly, dispite
the final SEGV error.

I'm accepting suggestions.

Romptekst bericht Robert Steinmetz, AIA
Principal
Steinmetz & Associates

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NoBody

RE: 1.8 server child exit Segmentation Falt

In reply to this post by Robert Steinmetz AIA

Oh darn,

Never mind my last mail; read over it.

I'm having the same problem, Ubuntu server 10.04 32bits, PHP 5.3.2 from
repository, eGroupware 1.8 from OpenSuse Deb repository.

Tried the solutions proposed here, nothing worked:

- uninstalled php-apc; no other chaching module installed (afaik).
- also tried installing php5-xcache, no result;
- disabled mod_deflate, still doesn't resolved the SEGV. But when this
module is disabled, the output of the request is shown correctly, dispite
the final SEGV error.

I'm accepting suggestions.

Romptekst bericht Robert Steinmetz, AIA
Principal
Steinmetz & Associates

If you reply to this email, your message will be added to the discussion below:

http://egroupware.219119.n3.nabble.com/1-8-server-child-exit-Segmentation-Falt-tp1567870p2563165.html

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jqueiroz

Re: 1.8 server child exit Segmentation Falt

In reply to this post by Robert Steinmetz AIA

Well, I ran apache in debug mode over GDB and got this BT:

#0 0xb7893415 in ?? () from /usr/lib/apache2/modules/libphp5.so
#1 0xb7893dfd in gc_collect_cycles () from /usr/lib/apache2/modules/libphp5.so
#2 0xb7874ff5 in ?? () from /usr/lib/apache2/modules/libphp5.so
#3 0xb7819868 in php_request_shutdown () from /usr/lib/apache2/modules/libphp5.so
#4 0xb790681c in ?? () from /usr/lib/apache2/modules/libphp5.so
#5 0xb7fdb031 in ap_run_handler (r=0xb837e3c8) at /build/buildd/apache2-2.2.14/server/config.c:159
#6 0xb7fdee17 in ap_invoke_handler (r=0xb837e3c8) at /build/buildd/apache2-2.2.14/server/config.c:373
#7 0xb7fee728 in ap_process_request (r=0xb837e3c8) at /build/buildd/apache2-2.2.14/modules/http/http_request.c:282
#8 0xb7feb258 in ap_process_http_connection (c=0xb83762f0) at /build/buildd/apache2-2.2.14/modules/http/http_core.c:190
#9 0xb7fe38a1 in ap_run_process_connection (c=0xb83762f0) at /build/buildd/apache2-2.2.14/server/connection.c:43
#10 0xb7ff3bea in child_main (child_num_arg=<value optimized out>) at /build/buildd/apache2-2.2.14/server/mpm/prefork/prefork.c:662
#11 0xb7ff3f21 in make_child (s=<value optimized out>, slot=0) at /build/buildd/apache2-2.2.14/server/mpm/prefork/prefork.c:702
#12 0xb7ff46af in ap_mpm_run (_pconf=0xb800e0a8, plog=0xb8040170, s=0xb80128e8) at /build/buildd/apache2-2.2.14/server/mpm/prefork/prefork.c:978
#13 0xb7fc5a92 in main (argc=2, argv=0xbffffcc4) at /build/buildd/apache2-2.2.14/server/main.c:742

Seems that php is throwing the segfault after the end of the script. I searched all the code for calls to "gc_collect_cycles", none found. I have no experience on PHP, but this seem to be a memory leak, or maybe a double-freed pointer.

I'll try to report this on the PHP5 forums, see if someone can help us.

jqueiroz

Re: 1.8 server child exit Segmentation Falt

Just refreshing the question,

I opened a bug in Ubuntu about this problem:
https://bugs.launchpad.net/ubuntu/+source/php5/+bug/725812

Ralf Becker-2

Re: 1.8 server child exit Segmentation Falt

To my knowledge you need the latest patched version for at least php
5.3.3, afaik only available for Maverick, to get rid of the segfaults.

If you look at the changelog, you can see tons of fixes imported from
Debian 6 (which also works well by now):

http://changelogs.ubuntu.com/changelogs/pool/main/p/php5/php5_5.3.3-1ubuntu9.3/changelog

As long as Ubuntu is not pushing the 5.3.3 version to ealier versions,
the easiest option is probably to update your Ubuntu system.

Ralf

Am 19.03.11 20:36, schrieb jqueiroz:

> Just refreshing the question,
>
> I opened a bug in Ubuntu about this problem:
> https://bugs.launchpad.net/ubuntu/+source/php5/+bug/725812
>
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jqueiroz

Re: 1.8 server child exit Segmentation Falt

No, upgrading to Maverick isn't an option. I cannot afford leaving the security of using a LTS version, to enter a routine of upgrade the server each 6 months.

By the way, the problem is "under control": disabling the "deflate" module of apache makes the SEGV to rise only after all the output is sent, so the users doesn't see the problem, just me, when I consult the logs.

This gives me time to wait for a better solution, doesn't matter if it comes in the form of a fix to PHP 5.3.2, or a backported new version.

Robert Steinmetz AIA

Re: 1.8 server child exit Segmentation Falt

I think back porting 5.3.3 is appropriate for an LTS version. Perhaps we can suggest that to Ubuntu. EGW is not the application suffering form these issues.

would tOn 3/20/2011 8:39 AM, jqueiroz wrote:

No, upgrading to Maverick isn't an option. I cannot afford leaving the
security of using a LTS version, to enter a routine of upgrade the server
each 6 months.

By the way, the problem is "under control": disabling the "deflate" module
of apache makes the SEGV to rise only after all the output is sent, so the
users doesn't see the problem, just me, when I consult the logs.

This gives me time to wait for a better solution, doesn't matter if it comes
in the form of a fix to PHP 5.3.2, or a backported new version.

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