Debian Bug report logs - #691318
libapache2-mod-php5: Segmentation fault when mediawiki used on a fusionforge install

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: olivier.berger@telecom-sudparis.eu

To: submit@bugs.debian.org

Subject: libapache2-mod-php5: Segmentation fault when mediawiki used on a fusionforge install

Date: Wed, 24 Oct 2012 11:43:25 +0200

Package: libapache2-mod-php5
Version: 5.4.4-7
Severity: normal

I've installed FusionForge on a wheezy system (using rebuilt packages
from the 5.2 branch, FWIW), and I get crashes when mediawiki is used to
edit pages.

Apache's error log reports only :
[Wed Oct 24 11:35:31 2012] [notice] child pid 13403 exit signal Segmentation fault (11)

Appart from that, it's very hard to tell what's wrong.

Thanks in advance.

Hope this helps.

Best regards,
-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-3-amd64 (SMP w/1 CPU core)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash

Versions of packages libapache2-mod-php5 depends on:
ii  apache2-mpm-prefork  2.2.22-11
ii  apache2.2-common     2.2.22-11
ii  libbz2-1.0           1.0.6-4
ii  libc6                2.13-35
ii  libcomerr2           1.42.5-1
ii  libdb5.1             5.1.29-5
ii  libgssapi-krb5-2     1.10.1+dfsg-2
ii  libk5crypto3         1.10.1+dfsg-2
ii  libkrb5-3            1.10.1+dfsg-2
ii  libmagic1            5.11-2
ii  libonig2             5.9.1-1
ii  libpcre3             1:8.30-5
ii  libqdbm14            1.8.78-2
ii  libssl1.0.0          1.0.1c-4
ii  libstdc++6           4.7.1-7
ii  libxml2              2.8.0+dfsg1-6
ii  mime-support         3.52-1
ii  php5-common          5.4.4-7
ii  tzdata               2012g-1
ii  ucf                  3.0025+nmu3
ii  zlib1g               1:1.2.7.dfsg-13

Versions of packages libapache2-mod-php5 recommends:
ii  php5-cli  5.4.4-7

Versions of packages libapache2-mod-php5 suggests:
ii  php-pear  5.4.4-7

-- no debconf information

Message #10 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Markus Lichtenstein <markus.lichtenstein@gmx.de>

To: 691318@bugs.debian.org

Subject: Similar to 694473?

Date: Sun, 23 Dec 2012 11:05:54 +0100

Same problem occurs here ...

-- 
Markus Lichtenstein

Message #15 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Stefan Fritsch <sf@sfritsch.de>

To: 691318@bugs.debian.org

Cc: 691318-submitter@bugs.debian.org

Subject: Maybe duplicate of 694473 ?

Date: Sun, 23 Dec 2012 16:13:27 +0100

This may be the same as

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=694473

which has more infos.

Message #23 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Lior Kaplan <kaplan@debian.org>

To: Stefan Fritsch <sf@sfritsch.de>, 691318@bugs.debian.org

Subject: Re: [php-maint] Bug#691318: Maybe duplicate of 694473 ?

Date: Tue, 25 Dec 2012 19:52:29 +0200

[Message part 1 (text/plain, inline)]

Why do you think they are similar ? One is a segfault and the other is a
recursion .

Kaplan

On Sun, Dec 23, 2012 at 5:13 PM, Stefan Fritsch <sf@sfritsch.de> wrote:

> This may be the same as
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=694473
>
> which has more infos.
>
> _______________________________________________
> pkg-php-maint mailing list
> pkg-php-maint@lists.alioth.debian.org
> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-php-maint
>

[Message part 2 (text/html, inline)]

Message #28 received at 691318-quiet@bugs.debian.org (full text, mbox, reply):

From: Lior Kaplan <kaplanlior@gmail.com>

To: olivier.berger@telecom-sudparis.eu, Markus Lichtenstein <markus.lichtenstein@gmx.de>

Cc: 691318-quiet@bugs.debian.org

Subject: debian #691318 - please supply backtrace

Date: Tue, 25 Dec 2012 19:55:24 +0200

[Message part 1 (text/plain, inline)]

Hi Guys,

Please supply a backtrace as part of bug #691318. See
http://wiki.debian.org/HowToGetABacktrace for more details.

We can't really guess what is the problem without some hints.

Thanks,

Kaplan

[Message part 2 (text/html, inline)]

Message #33 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Stefan Fritsch <sf@sfritsch.de>

To: Lior Kaplan <kaplan@debian.org>

Cc: 691318@bugs.debian.org

Subject: Re: [php-maint] Bug#691318: Maybe duplicate of 694473 ?

Date: Tue, 25 Dec 2012 20:41:49 +0100 (CET)

On Tue, 25 Dec 2012, Lior Kaplan wrote:

> Why do you think they are similar ? One is a segfault and the other is a
> recursion .

The recursion in #694473 causes a stack overflow, which then leads to a 
segfault, too. And both issues involve mediawiki. Therefore it seems 
likely to me that they involve the same php functions and hit the same 
problem.

>
> Kaplan
>
> On Sun, Dec 23, 2012 at 5:13 PM, Stefan Fritsch <sf@sfritsch.de> wrote:
>
>> This may be the same as
>>
>> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=694473
>>
>> which has more infos.
>>
>> _______________________________________________
>> pkg-php-maint mailing list
>> pkg-php-maint@lists.alioth.debian.org
>> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-php-maint
>>
>

Message #38 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Olivier Berger <olivier.berger@it-sudparis.eu>

To: Lior Kaplan <kaplanlior@gmail.com>, 691318@bugs.debian.org

Cc: 694473-quiet@bugs.debian.org

Subject: Re: Bug#691318: debian #691318 - please supply backtrace

Date: Mon, 7 Jan 2013 17:09:40 +0100

On Tue, Dec 25, 2012 at 07:55:24PM +0200, Lior Kaplan wrote:
> Hi Guys,
> 
> Please supply a backtrace as part of bug #691318. See
> http://wiki.debian.org/HowToGetABacktrace for more details.
> 
> We can't really guess what is the problem without some hints.
> 

Unfortunately, I can't :-(

I've tried producing core dumps, but cannot succeed.

I'm using mpm-prefork, and it seems that no cores will be produced for the child processes, although the master process (the one owned by root) dumps cores on signal 11 perfectly.

Maybe it's because the reproduction scenario involves an apache2 reload (yes, it seems very similar to #694473 : trying to post an edit to a wiki page after an /etc/init.d/apache2 reload has happened).

Are there any more instructions that what's in /usr/share/doc/apache2-mpm-prefork/README.backtrace on how to make sure apache's sub processes can dump cores ?

Thanks in advance.

Best regards,
-- 
Olivier BERGER 
http://www-public.telecom-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8
Ingenieur Recherche - Dept INF
Institut Mines-Telecom, Telecom SudParis, Evry (France)

Message #43 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Olivier Berger <olivier.berger@it-sudparis.eu>

To: Stefan Fritsch <sf@sfritsch.de>, 694473@bugs.debian.org

Cc: 691318@bugs.debian.org

Subject: Re: Bug#694473: apache2: segmentation fault after reload, maybe PHP

Date: Mon, 7 Jan 2013 17:13:39 +0100

Hi.

On Sun, Dec 23, 2012 at 04:09:48PM +0100, Stefan Fritsch wrote:
> 
> It always happens after there has been an graceful reload (i.e.
> /etc/init.d/apache2 reload), so it will break after every logrotate (therefore
> bumping severity).
> 

FWIW, I think #691318 is probably a duplicate of #694473, as I can reproduce systematically a crash in an apache subprocess when editing a mediawiki page right after a reload.

However, I've been unable to produce core dumps (see my previous message to #691318) to confirm for sure.

In any case, thanks for the hint.

Best regards,

-- 
Olivier BERGER 
http://www-public.telecom-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8
Ingenieur Recherche - Dept INF
Institut Mines-Telecom, Telecom SudParis, Evry (France)

Message #48 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Stefan Fritsch <sf@sfritsch.de>

To: Olivier Berger <olivier.berger@it-sudparis.eu>

Cc: 691318@bugs.debian.org

Subject: Re: Bug#694473: apache2: segmentation fault after reload, maybe PHP

Date: Mon, 7 Jan 2013 21:28:53 +0100

On Monday 07 January 2013, you wrote:
> Hi.
> 
> On Sun, Dec 23, 2012 at 04:09:48PM +0100, Stefan Fritsch wrote:
> > It always happens after there has been an graceful reload (i.e.
> > /etc/init.d/apache2 reload), so it will break after every
> > logrotate (therefore bumping severity).
> 
> FWIW, I think #691318 is probably a duplicate of #694473, as I can
> reproduce systematically a crash in an apache subprocess when
> editing a mediawiki page right after a reload.
> 
> However, I've been unable to produce core dumps (see my previous
> message to #691318) to confirm for sure.
> 
> In any case, thanks for the hint.

Strange, I can't remember having the same problem.

You could try setting /proc/sys/fs/suid_dumpable to 1. But this is a 
security issue on a production server, read the proc man page to see 
if it is acceptable.

Also, look into /etc/apache2 for coredumps, too. There is a short time 
period during restart where the core dump directory will be set to the 
compiled-in server root directory (I think this is a bug).

Message #53 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Nye Liu <nyet@nyet.org>

To: Stefan Fritsch <sf@sfritsch.de>

Cc: Olivier Berger <olivier.berger@it-sudparis.eu>, 691318@bugs.debian.org

Subject: Re: Bug#694473: apache2: segmentation fault after reload, maybe PHP

Date: Sun, 13 Jan 2013 11:28:00 -0800

On Mon, Jan 07, 2013 at 09:28:53PM +0100, Stefan Fritsch wrote:
> On Monday 07 January 2013, you wrote:
> > However, I've been unable to produce core dumps (see my previous
> > message to #691318) to confirm for sure.
> 
> Strange, I can't remember having the same problem.
> 
> You could try setting /proc/sys/fs/suid_dumpable to 1.

I had to use fs.suid_dumpable=2

> Also, look into /etc/apache2 for coredumps, too. There is a short time 
> period during restart where the core dump directory will be set to the 
> compiled-in server root directory (I think this is a bug).

Yes. The segfault happens before any of apache's core dump directory stuff is
processed.

I used kernel.core_pattern=/var/tmp/cores/%e.%p.%h.%t to make it easier to sort
out what cores are what.

Message #58 received at 691318-close@bugs.debian.org (full text, mbox, reply):

From: Ondřej Surý <ondrej@debian.org>

To: 691318-close@bugs.debian.org

Subject: Bug#691318: fixed in php5 5.4.4-12

Date: Mon, 21 Jan 2013 11:18:27 +0000

Source: php5
Source-Version: 5.4.4-12

We believe that the bug you reported is fixed in the latest version of
php5, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 691318@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Ondřej Surý <ondrej@debian.org> (supplier of updated php5 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.8
Date: Mon, 21 Jan 2013 11:02:25 +0100
Source: php5
Binary: php5 php5-common libapache2-mod-php5 libapache2-mod-php5filter php5-cgi php5-cli php5-fpm libphp5-embed php5-dev php5-dbg php-pear php5-curl php5-enchant php5-gd php5-gmp php5-imap php5-interbase php5-intl php5-ldap php5-mcrypt php5-mysql php5-mysqlnd php5-odbc php5-pgsql php5-pspell php5-recode php5-snmp php5-sqlite php5-sybase php5-tidy php5-xmlrpc php5-xsl
Architecture: source amd64 all
Version: 5.4.4-12
Distribution: unstable
Urgency: low
Maintainer: Debian PHP Maintainers <pkg-php-maint@lists.alioth.debian.org>
Changed-By: Ondřej Surý <ondrej@debian.org>
Description: 
 libapache2-mod-php5 - server-side, HTML-embedded scripting language (Apache 2 module)
 libapache2-mod-php5filter - server-side, HTML-embedded scripting language (apache 2 filter mo
 libphp5-embed - HTML-embedded scripting language (Embedded SAPI library)
 php-pear   - PEAR - PHP Extension and Application Repository
 php5       - server-side, HTML-embedded scripting language (metapackage)
 php5-cgi   - server-side, HTML-embedded scripting language (CGI binary)
 php5-cli   - command-line interpreter for the php5 scripting language
 php5-common - Common files for packages built from the php5 source
 php5-curl  - CURL module for php5
 php5-dbg   - Debug symbols for PHP5
 php5-dev   - Files for PHP5 module development
 php5-enchant - Enchant module for php5
 php5-fpm   - server-side, HTML-embedded scripting language (FPM-CGI binary)
 php5-gd    - GD module for php5
 php5-gmp   - GMP module for php5
 php5-imap  - IMAP module for php5
 php5-interbase - interbase/firebird module for php5
 php5-intl  - internationalisation module for php5
 php5-ldap  - LDAP module for php5
 php5-mcrypt - MCrypt module for php5
 php5-mysql - MySQL module for php5
 php5-mysqlnd - MySQL module for php5 (Native Driver)
 php5-odbc  - ODBC module for php5
 php5-pgsql - PostgreSQL module for php5
 php5-pspell - pspell module for php5
 php5-recode - recode module for php5
 php5-snmp  - SNMP module for php5
 php5-sqlite - SQLite module for php5
 php5-sybase - Sybase / MS SQL Server module for php5
 php5-tidy  - tidy module for php5
 php5-xmlrpc - XML-RPC module for php5
 php5-xsl   - XSL module for php5
Closes: 691318 694473
Changes: 
 php5 (5.4.4-12) unstable; urgency=low
 .
   * Apply two workaround patches for crashes caused by infinite recursion
     in php_rfc1867_callback (Closes: #694473, #691318)
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Message #63 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Ondřej Surý <ondrej@sury.org>

To: olivier.berger@telecom-sudparis.eu, 691318@bugs.debian.org, markus.lichtenstein@gmx.de, Stefan Fritsch <sf@sfritsch.de>, Mechtilde <ooo@mechtilde.de>, Mali <mali-nospam01@ram.rwth-aachen.de>

Subject: Re: Bug#694473 session extension causes endless recursion after graceful reload

Date: Mon, 21 Jan 2013 21:47:52 +0100

Hi,

I have pulled Stephan's patch and the one from referenced bug. Could
you please confirm that this fixes the issue (5.4.4-12), and if not
would there be anyone willing to try php5 from experimental (5.4.11-1)
if that fixes the issue? (Probably not, but it's a worth trying.)

Ondrej
--
Ondřej Surý <ondrej@sury.org>

Message #68 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Ondřej Surý <ondrej@debian.org>

To: Stefan Fritsch <sf@sfritsch.de>, 691318@bugs.debian.org, 694473@bugs.debian.org, 694473-submitter@bugs.debian.org

Cc: 691318-submitter@bugs.debian.org

Subject: Re: [php-maint] Bug#691318: Maybe duplicate of 694473 ?

Date: Wed, 23 Jan 2013 16:36:09 +0100

There's a slight problem and that is I can't reproduce the problem
with 5.4.4-11 in amd64 wheezy chroot neither with mediawiki package
nor the vanilla mediawiki 1.20.2, so I cannot confirm if the 5.4.4-12
fixed the error or not.

Could one of the affected people please confirm?  Unless you confirm
the bug is fixed, it cannot be propagated to wheezy, and I would
really much like to avoid releasing wheezy with a RC bug in PHP.

Ondrej

On Sun, Dec 23, 2012 at 4:13 PM, Stefan Fritsch <sf@sfritsch.de> wrote:
> This may be the same as
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=694473
>
> which has more infos.
>
> _______________________________________________
> pkg-php-maint mailing list
> pkg-php-maint@lists.alioth.debian.org
> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-php-maint



-- 
Ondřej Surý <ondrej@sury.org>

Message #76 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Olivier Berger <olivier.berger@it-sudparis.eu>

To: Ondřej Surý <ondrej@debian.org>

Cc: 691318@bugs.debian.org, 694473@bugs.debian.org

Subject: Re: [php-maint] Bug#691318: Bug#691318: Maybe duplicate of 694473 ?

Date: Thu, 24 Jan 2013 10:54:33 +0100

Hi.

Ondřej Surý <ondrej@debian.org> writes:

> There's a slight problem and that is I can't reproduce the problem
> with 5.4.4-11 in amd64 wheezy chroot neither with mediawiki package
> nor the vanilla mediawiki 1.20.2, so I cannot confirm if the 5.4.4-12
> fixed the error or not.
>
> Could one of the affected people please confirm?  Unless you confirm
> the bug is fixed, it cannot be propagated to wheezy, and I would
> really much like to avoid releasing wheezy with a RC bug in PHP.
>

I've just tested posting a mediawiki edit on my fusionforge server
installed with 5.4.4-11 and could reproduce the problem right after an
/etc/init.d/apache2 reload.

Will now test 5.4.4-12 and report.

Best regards,

-- 
Olivier BERGER 
http://www-public.telecom-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8
Ingenieur Recherche - Dept INF
Institut Mines-Telecom, Telecom SudParis, Evry (France)

Message #81 received at 691318@bugs.debian.org (full text, mbox, reply):

From: Olivier Berger <olivier.berger@it-sudparis.eu>

To: OndÅ?ej Surý <ondrej@sury.org>, 691318@bugs.debian.org

Cc: 694473@bugs.debian.org

Subject: Re: Bug#691318: Bug#694473 session extension causes endless recursion after graceful reload

Date: Thu, 24 Jan 2013 11:08:39 +0100

Hi.

On Mon, Jan 21, 2013 at 09:47:52PM +0100, Ondřej Surý wrote:
> Hi,
> 
> I have pulled Stephan's patch and the one from referenced bug. Could
> you please confirm that this fixes the issue (5.4.4-12),

Thanks alot.

I've just tested with 5.4.4-12 from unstable, and it seems to fix the issue : I can now make edits in the mediawiki installed with fusionforge right after an /etc/init.d/apache2 reload without a segmentation fault :-)

> and if not
> would there be anyone willing to try php5 from experimental (5.4.11-1)
> if that fixes the issue? (Probably not, but it's a worth trying.)
> 

FWIW, I won't test it : machine in production.

Hope this helps.

Best regards,
-- 
Olivier BERGER 
http://www-public.telecom-sudparis.eu/~berger_o/ - OpenPGP-Id: 2048R/5819D7E8
Ingenieur Recherche - Dept INF
Institut Mines-Telecom, Telecom SudParis, Evry (France)

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