Re: [Solved] httpd vs. avahi and SELinux in Fedora 11

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On 07/13/2009 09:02 AM, Daniel J Walsh wrote:
On 07/11/2009 07:06 PM, Steven F. LeBrun wrote:
  
After doing a clean install of Fedora 11, the Apache webserver, httpd
2.2.11, is failing.  The error log [see below] shows that all the httpd
children are killing themselves with Segmentation faults.

Httpd was working fine in Fedora 10, same laptop and I started with a
fresh install of Apache's httpd using the RPM provided for Fedora 11. 
At first I thought that maybe it is an SELinux problem.  Then I noticed
in the error_log the following line:

    [error] avahi_entry_group_add_service_strlst("tardis") failed: Local
name collision

The FQHN of my laptop where I am trying to run httpd is
tardis.home.lebruns.com

Question 1:  Is the segmentation faults due to an SELinux policy issue? 
I checked the files that should be displayed and their security context
looks correct.  Is there a problem displayed in the first error log line
where it states:

  SELinux policy enabled; httpd running as context
unconfined_u:system_r:httpd_t:s0

Question 2:  Any ideas of what is causing the avahi error message?  What
causes a "Local name collision"?  None of the configuration files
specify the host name that httpd is running on.  [Setting ServiceName
did not change anything.]

Error Log:
[Sat Jul 11 18:50:26 2009] [notice] SELinux policy enabled; httpd
running as context unconfined_u:system_r:httpd_t:s0
[Sat Jul 11 18:50:26 2009] [notice] suEXEC mechanism enabled (wrapper:
/usr/sbin/suexec)
[Sat Jul 11 18:50:26 2009] [notice] Digest: generating secret for digest
authentication ...
[Sat Jul 11 18:50:26 2009] [notice] Digest: done
[Sat Jul 11 18:50:26 2009] [notice] mod_python: Creating 4 session
mutexes based on 256 max processes and 0 max threads.
[Sat Jul 11 18:50:26 2009] [notice] mod_python: using mutex_directory /tmp
[Sat Jul 11 18:50:27 2009] [error]
avahi_entry_group_add_service_strlst("tardis") failed: Local name collision
[Sat Jul 11 18:50:27 2009] [notice] Apache/2.2.11 (Unix) DAV/2
mod_mono/2.4 mod_nss/2.2.11 NSS/3.12.2.0 PHP/5.2.9 mod_python/3.3.1
Python/2.6 mod_ssl/2.2.11 OpenSSL/0.9.8k-fips mod_perl/2.0.4
Perl/v5.10.0 configured -- resuming normal operations
[Sat Jul 11 18:50:27 2009] [notice] child pid 10956 exit signal
Segmentation fault (11)
[Sat Jul 11 18:50:27 2009] [notice] child pid 10957 exit signal
Segmentation fault (11)
...
The exit signal Segmentation fault (11) repeats ad nausium until httpd
is stopped.

Any help and/or suggestions will be appreciated.

    
Does this happen if SELinux is in permissive mode?  Is selinux reporting errors in the /var/log/audit/audit.log?

# getsebool -a | grep avahi
httpd_dbus_avahi --> on

THe only avahi/dbus boolean is defined above.


  

It turns out that the solution to my problem appeared in another thread, posted after my original posting.  [See: "httpd segfault" thread started by Jameson.]

        On 07/12/2009 03:18 PM, Jameson wrote:
    As soon as I finally decide to ask, I find the solution:
    https://bugzilla.redhat.com/show_bug.cgi?id=502133

The problem was not with avahi or SELinux but with the nss module.  Renaming the nss.conf file to nss.conf.no (in /etc/httpd/conf.d/) so that it does not load, solved my problem.

The nss.conf file was placed in the /etc/httpd/conf.d/ directory by the rpm file that installed the Apache httpd server.

--
  Steven F. LeBrun

Quote: "Behold the lowly turtle," the astronaut had quoted. "He only makes progress when he sticks his neck out."
     -- Ben Bova, from "Return to Mars"

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