php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #74287 DNS Resolution appears broken with recent Ubuntu update
Submitted: 2017-03-21 21:33 UTC Modified: 2017-03-23 17:39 UTC
Votes:18
Avg. Score:4.8 ± 0.5
Reproduced:17 of 17 (100.0%)
Same Version:11 (64.7%)
Same OS:15 (88.2%)
From: jndockery at gmail dot com Assigned:
Status: Not a bug Package: Network related
PHP Version: 5.6.30 OS: Ubuntu 14.04.5 LTS
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: jndockery at gmail dot com
New email:
PHP Version: OS:

 

 [2017-03-21 21:33 UTC] jndockery at gmail dot com 
Description:
------------
After an automated update, PHP appears unable to resolve DNS entries

 - Other commands still resolve properly: ping, telnet, ldapsearch, curl
 - Affected 3 services on separate servers
 - Servers without unattended-upgrades (updated 2017-03-17) still functioning
 - Adding a manual entry in /etc/hosts allows DNS resolution

Affected service examples:
 - ldap_bind(): "Can't contact LDAP server"
 - PHP curl: "Could not resolve host: ..."
 - SMTP: "Connection could not be established with host smtp.sendgrid.net"

Packages recently updated:

 - libgnutls-openssl27:amd64
 - multiarch-support:amd64
 - libfreetype6:amd64
 - libc-dev-bin:amd64
 - libc-bin:amd64
 - libc6:amd64
 - libgnutls26:amd64
 - libc6-dev:amd64

Start-Date: 2017-03-21  06:31:17
Upgrade: libgnutls-openssl27:amd64 (2.12.23-12ubuntu2.6, 2.12.23-12ubuntu2.7), multiarch-support:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libfreetype6:amd64 (2.5.2-1ubuntu2.5, 2.5.2-1ubuntu2.6), libc-dev-bin:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libc-bin:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libc6:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libgnutls26:amd64 (2.12.23-12ubuntu2.6, 2.12.23-12ubuntu2.7), libc6-dev:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10)
End-Date: 2017-03-21  06:31:22


Thank you!


Test script:
---------------
<?
  $url = "http://$_SERVER[HTTP_HOST]";
  $ch = curl_init();
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_exec($ch);
  print_r(curl_error($ch));
  curl_close($ch);


Expected result:
----------------
no output

Actual result:
--------------
Could not resolve host: example.example.com

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2017-03-21 21:55 UTC] spam2 at rhsoft dot net 
and why don't you write a bugreport on the ubuntu bugtracker instead upstream? most likely some library update broke the PHP installation - both is from ubuntu and PHP 5.6 is more or less EOL at all

and another question: who does "automated updates" and then complains at upstream bugtrackers that some unattended downstream stuff broke whatever?
 [2017-03-21 22:46 UTC] nikic@php.net 
@rhsoft: It would be much appreciated if you could tone down your comments a bit. They are commonly passive aggressive, sometimes downright rude and contribute to a somewhat unpleasant atmosphere on this bug tracker.
 [2017-03-22 10:33 UTC] spam2 at rhsoft dot net 
sorry, but i don't get how ideas like "oh, my distribution updated libc and something broke, i will report a bug on the victims upstream bugtracker" are growing
 [2017-03-22 11:16 UTC] alex at 1200wd dot com 
For people like me that happened to stumble on this:

Checking my apt logs the following packages were updated at that time:

- libxml2
- libc-bin

This happened on an ubuntu 16.04 server with php7.
 [2017-03-22 13:14 UTC] frank at groenewoud dot me 
Changelog libc-bin:
eglibc (2.19-0ubuntu6.11) trusty-security; urgency=medium

  * REGRESSION UPDATE: Previous update introduced ABI breakage in
    internal glibc query ABI
    - Back out patches/any/CVE-2015-5180-regression.diff
      (LP: #1674532)

 -- Steve Beattie <sbeattie@ubuntu.com>  Tue, 21 Mar 2017 03:28:13 -0700


Bug 1674532:
After installing the libc6_2.19-0ubuntu6.10_amd64_udeb package during the automated install of ubuntu 14.04.5, the system was suddenly unable to resolve hostnames via dns. Installing -0ubuntu6.9 resolved the issue. Reinstalling -ubuntu6.10 broke the system again.

I note that -ubuntu6.10 was recently added to the archive.

I am currently unable to install Ubuntu 14.04.5.
 [2017-03-22 14:22 UTC] afrase at wddonline dot com 
According to https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1674776

The cause might be the fix of CVE-2016-3706: getaddrinfo: stack overflow in hostent conversion.
 [2017-03-22 17:37 UTC] jndockery at gmail dot com
-Status: Open +Status: Closed
 [2017-03-22 17:37 UTC] jndockery at gmail dot com 
Thanks to all for the helpful resources - 

libc version 2.19-0ubuntu6.11 resolves the issue introduced in 2.19-0ubuntu6.10.
 [2017-03-22 21:16 UTC] mateus at simplehost dot com dot br 
Hello,
I saw this same behavior in 8 Ubuntu servers, with automated security updates.
 [2017-03-22 21:59 UTC] spam2 at rhsoft dot net 
> I saw this same behavior in 8 Ubuntu servers, with automated security update

what is a "ubuntu server"? :-)

joke aside - and hence when everything but not PHP is update dand PHP has a problem than it#s not the responsibility of PHP and when you get your PHP from your distribution it is NEVER a php upstream bug wehan some random package is updated and php breaks
 [2017-03-23 17:39 UTC] heiglandreas@php.net
-Status: Closed +Status: Not a bug
 [2017-03-24 14:02 UTC] danielpetrak1 at gmail dot com 
I have experienced same issue, i resolved the problem. Howerver we use Plesk Panel. Via Plesk I changed PHP version and then changed it back to same version. Problem fixed, probably some PHP config got rebuiled by that.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Fri Nov 22 03:01:27 2024 UTC