[Bug 1674532] Re: glibc update caused NSS ABI break

[Seth Arnold]

Daniel, if this bug is related to your issue you can simply reboot to
fix it. If it's still broken then it's not this issue.

Thanks

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Daniel Colceag]

I'm having issues with DNS over VPN since 2.24-0ubuntu2. I cannot access
the company's internal sites through VPN anymore. Please tell me what
should I post here for more details

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Launchpad Bug Tracker]

This bug was fixed in the package glibc - 2.24-9ubuntu2

---
glibc (2.24-9ubuntu2) zesty; urgency=medium

  * debian/patches/any/cvs-resolv-internal-qtype.diff: Revert to avoid
failure in name resolution on upgrades from yakkety (LP: #1674532)

 -- Adam Conrad   Tue, 21 Mar 2017 15:27:15 -0600

** Changed in: glibc (Ubuntu)
   Status: Fix Committed => Fix Released

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Adam Conrad]

@paul-dubs: "dig @8.8.8.8", by definition, completely bypasses the libc
resolver.  It makes a direct connection to 8.8.8.8 and queries it.  If
that's slow or broken for you, you have a link layer networking issue,
or Google's geo-located 8.8.8.8 near you is broken, or some other
similar thing.  It literally can't relate to the this update.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[bhat3]

#Fixed LTS package versions: 2.23-0ubuntu7 (xenial) & 2.19-0ubuntu6.11
(trusty)

@jozznaz, jm7485 & co: You're not alone for me it was way more than 50
boxes where the PHP stuff couldn't resolve names anymore and needed my
attention. Nasty and frustrating for sure ... and i was also swearing ;)

But for all the "haters": Keep in mind that automatic updates means you
automated a change request that can fail by definition, that's why you
should do them in a specific time frame so you're able to respond
quickly in case of failure. If you don't know how to do that and you're
going fully productive with your servers better find a real Linux admin
who knows more then just "apt install unattended-upgrades" ;)

Otherwise a preintegrated solution to problems with libc updates is to
blacklist them in /etc/apt/apt.conf.d/50unattended-upgrades:

// List of packages to not update (regexp are supported)
Unattended-Upgrade::Package-Blacklist {
//  "vim";
//  "libc6";
//  "libc6-dev";
//  "libc6-i686";
};

But be aware the security holes in there can effect a lot of stuff and
will not get patched if you blacklist them. In general i run unattended-
upgrades for many many years now and it was the second time i got nuked
so it's still a good trade off if you consider the time you save for
manually patching or that you have patched systems when you don't have
the time.

Another paid solution would be to talk with Canonical about Landscape in
what ways it can help here: https://landscape.canonical.com/

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Paul Dubs]

I am also still seeing problems related to hostname resolution.

Sometimes, a simple 'dig @8.8.8.8 google.com' will take up to 30 seconds
and then timeout, sometimes it works after a long delay, and sometimes
it works as quick as it should.

In any instance where it works, it says that the dns server answered in
about 30ms, so the delay must be from somewhere else.

I'm running this with glibc version 2.24-3ubuntu2 on yakkety.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Mathew Hodson]

** No longer affects: glibc (Ubuntu Yakkety)

** Changed in: glibc (Ubuntu)
   Importance: Undecided => Critical

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Mathew Hodson]

** No longer affects: eglibc (Ubuntu)

** No longer affects: eglibc (Ubuntu Xenial)

** No longer affects: eglibc (Ubuntu Yakkety)

** No longer affects: glibc (Ubuntu Precise)

** No longer affects: glibc (Ubuntu Trusty)

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Seth Arnold]

Lukas, if your DNS works but is slow that's probably two junk
nameservers listed in /etc/resolv.conf before one working nameserver. A
full debugging of your DNS is probably out of scope for a bug report; I
suggest heading to askubuntu.com or IRC.

Thanks

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Lukas]

http://stackoverflow.com/questions/43053872/file-get-contents-with-full-
url-to-same-server-very-slow-with-php-7-as-of-very-r

it is not even necessary that the DNS lookup doesn't work, it actually
can be just very very slow so it seems to me at least

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Lukas]

and yes, to say as well:

we have 4 servers affected, clients are very upset. We will be disabling
automatic updates.

for the meantime: what is the proper solution to this?

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Nacho Vazquez]

It's still happening to my servers too.

It looks like they are being all hit (12 of them) at the same time. This
is after an apt-get update / upgrade cycle and a reboot.


$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.5 LTS"

$ apt-cache show libc6 | grep Version
Version: 2.19-0ubuntu6.11
Version: 2.19-0ubuntu6

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Martin Su]

We are still encountering intermittent DNS resolution issues, even after
an OS reboot. For example:

Net::OpenTimeout: execution expired
  /usr/lib/ruby/2.3.0/resolv-replace.rb:   25:in `initialize'
  /usr/lib/ruby/2.3.0/resolv-replace.rb:   25:in `initialize'
/usr/lib/ruby/2.3.0/net/smtp.rb:  542:in `open'
/usr/lib/ruby/2.3.0/net/smtp.rb:  542:in `tcp_socket'


Environment:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 14.04.4 LTS
Release:14.04
Codename:   trusty

$ grep '2017-03-2' /var/log/unattended-upgrades/unattended-upgrades.log
2017-03-20 06:42:25,345 INFO Initial blacklisted packages: postgresql 
redis-server
2017-03-20 06:42:25,346 INFO Starting unattended upgrades script
2017-03-20 06:42:25,347 INFO Allowed origins are: ['o=Ubuntu,a=trusty-security']
2017-03-20 06:42:41,350 INFO No packages found that can be upgraded unattended 
and no pending auto-removals
2017-03-21 06:35:11,528 INFO Initial blacklisted packages: postgresql 
redis-server
2017-03-21 06:35:11,531 INFO Starting unattended upgrades script
2017-03-21 06:35:11,531 INFO Allowed origins are: ['o=Ubuntu,a=trusty-security']
2017-03-21 06:35:47,806 INFO Packages that will be upgraded: libc-bin 
libc-dev-bin libc6 libc6-dev libfreetype6 libgnutls-openssl27 libgnutls26 
multiarch-support
2017-03-21 06:35:47,807 INFO Writing dpkg log to 
'/var/log/unattended-upgrades/unattended-upgrades-dpkg_2017-03-21_06:35:47.807180.log'
2017-03-21 06:35:55,379 INFO All upgrades installed
2017-03-21 06:36:02,861 INFO Packages that are auto removed: ''
2017-03-21 06:36:02,941 INFO Packages auto-removed
2017-03-22 06:31:53,606 INFO Initial blacklisted packages: postgresql 
redis-server
2017-03-22 06:31:53,607 INFO Starting unattended upgrades script
2017-03-22 06:31:53,607 INFO Allowed origins are: ['o=Ubuntu,a=trusty-security']
2017-03-22 06:32:13,869 INFO Packages that will be upgraded: libc-bin 
libc-dev-bin libc6 libc6-dev multiarch-support
2017-03-22 06:32:13,870 INFO Writing dpkg log to 
'/var/log/unattended-upgrades/unattended-upgrades-dpkg_2017-03-22_06:32:13.869840.log'
2017-03-22 06:32:19,722 INFO All upgrades installed
2017-03-22 06:32:25,622 INFO Packages that are auto removed: ''
2017-03-22 06:32:25,668 INFO Packages auto-removed
2017-03-23 06:28:02,799 INFO Initial blacklisted packages: postgresql 
redis-server
2017-03-23 06:28:02,800 INFO Starting unattended upgrades script
2017-03-23 06:28:02,801 INFO Allowed origins are: ['o=Ubuntu,a=trusty-security']
2017-03-23 06:28:10,368 INFO No packages found that can be upgraded unattended 
and no pending auto-removals
2017-03-24 06:29:48,590 INFO Initial blacklisted packages: postgresql 
redis-server
2017-03-24 06:29:48,591 INFO Starting unattended upgrades script
2017-03-24 06:29:48,592 INFO Allowed origins are: ['o=Ubuntu,a=trusty-security']
2017-03-24 06:30:03,308 INFO Packages that will be upgraded: git git-core 
git-man
2017-03-24 06:30:03,309 INFO Writing dpkg log to 
'/var/log/unattended-upgrades/unattended-upgrades-dpkg_2017-03-24_06:30:03.308474.log'
2017-03-24 06:30:09,616 INFO All upgrades installed
2017-03-24 06:30:15,645 INFO Packages that are auto removed: ''
2017-03-24 06:30:15,694 INFO Packages auto-removed

$ cat 
/var/log/unattended-upgrades/unattended-upgrades-dpkg_2017-03-21_06:35:47.807180.log
Preconfiguring packages ...
(Reading database ... 107829 files and directories currently installed.)
Preparing to unpack .../libc6-dev_2.19-0ubuntu6.10_amd64.deb ...
Unpacking libc6-dev:amd64 (2.19-0ubuntu6.10) over (2.19-0ubuntu6.9) ...
Preparing to unpack .../libc-dev-bin_2.19-0ubuntu6.10_amd64.deb ...
Unpacking libc-dev-bin (2.19-0ubuntu6.10) over (2.19-0ubuntu6.9) ...
Preparing to unpack .../libc-bin_2.19-0ubuntu6.10_amd64.deb ...
Unpacking libc-bin (2.19-0ubuntu6.10) over (2.19-0ubuntu6.9) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Setting up libc-bin (2.19-0ubuntu6.10) ...
(Reading database ... 107829 files and directories currently installed.)
Preparing to unpack .../libc6_2.19-0ubuntu6.10_amd64.deb ...
Unpacking libc6:amd64 (2.19-0ubuntu6.10) over (2.19-0ubuntu6.9) ...
Setting up libc6:amd64 (2.19-0ubuntu6.10) ...
Processing triggers for libc-bin (2.19-0ubuntu6.10) ...
(Reading database ... 107829 files and directories currently installed.)
Preparing to unpack .../libgnutls-openssl27_2.12.23-12ubuntu2.7_amd64.deb ...
Unpacking libgnutls-openssl27:amd64 (2.12.23-12ubuntu2.7) over 
(2.12.23-12ubuntu2.6) ...
Preparing to unpack .../libgnutls26_2.12.23-12ubuntu2.7_amd64.deb ...
Unpacking libgnutls26:amd64 (2.12.23-12ubuntu2.7) over (2.12.23-12ubuntu2.6) ...
Preparing to unpack .../libfreetype6_2.5.2-1ubuntu2.6_amd64.deb ...
Unpacking libfreetype6:amd64 (2.5.2-1ubuntu2.6) over (2.5.2-1ubuntu2.5) ...
Preparing to unpack .../multiarch-support_2.19-0ubuntu6.10_amd64.deb ...
Unpacking multiarch-support (2.19-0ubuntu6.10) over 

[Bug 1674532] Re: glibc update caused NSS ABI break

[Robie Basak]

** Tags added: regression-update

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Ponny]

Still getting this despite being on latest.  Seems to come and go.  I'm
on 14.04.5.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Jamie]

I just want to chime in here and say this bug has cost our company
thousands of dollars in lost revenue, and not to mention the unnecessary
cost of debugging time, because it broke two of the most important API
endpoints we use... Stripe for payments and the API for email delivery
with SendGrid, so customers where unable to sign up, and even if they
could, pay us.

We will be disabling automatic security updates from now on.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Andrew Wason]

After installing libc6 2.23-0ubuntu7, you can check for running
processes that are using a deleted (pre-update) /lib/x86_64-linux-
gnu/libc-2.23.so using lsof:

sudo lsof -d DEL | grep /lib/x86_64-linux-gnu/libc-2.23.so

Those processes need to be restarted to re-link with the fixed libc.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Marech]

Hey! Im little bit confused, which version is latest stable release
where bug is fixed?

Im Using

Distributor ID: Ubuntu
Description:Ubuntu 16.04.2 LTS
Release:16.04
Codename:   xenial

Package: libc6
Status: install ok installed
Priority: required
Section: libs
Installed-Size: 10948
Maintainer: Ubuntu Developers 
Architecture: amd64
Multi-Arch: same
Source: glibc
Version: 2.23-0ubuntu7
Replaces: libc6-amd64
Depends: libgcc1
Suggests: glibc-doc, debconf | debconf-2.0, locales
Breaks: hurd (<< 1:0.5.git20140203-1), libtirpc1 (<< 0.2.3), locales (<< 2.23), 
locales-all (<< 2.23), lsb-core (<= 3.2-27), nscd (<< 2.23)
Conffiles:
 /etc/ld.so.conf.d/x86_64-linux-gnu.conf 593ad12389ab2b6f952e7ede67b8fbbf
Description: GNU C Library: Shared libraries
 Contains the standard libraries that are used by nearly all programs on
 the system. This package includes shared versions of the standard C library
 and the standard math library, as well as many others.
Homepage: http://www.gnu.org/software/libc/libc.html
Original-Maintainer: GNU Libc Maintainers 


And still this morning got the same error.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Adam Conrad]

@justin-demaris: Yes, sort of.  What happened is that the first update
caused a regression, and the second update reverted that.  Any services
that were restarted with the broken update would then have been "re-
broken" with the update that backed out that change until they were
again re-started.  The good news is that people with less aggressive
update schedules probably skipped the bug entirely (as upgrading from an
older libc to the current one won't break), but that's scant comfort for
those who came along for the ride.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Richard Hillmann]

** Information type changed from Public to Public Security

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[Bug 1674532] Re: glibc update caused NSS ABI break

[thecyborgus]

For clarities sake, and so I can understand what happened on my servers,
is it correct that this issue cropped up with two different Unattended
installs on two consecutive days? (i.e. the 21st and the 22nd).

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Adam Conrad]

To everyone asking "when will this be fixed", it's fixed.  If you're up
to date, the regression is fixed.  This doesn't require "nightly"
reboots, it requires one reboot after being fully up to date.  Sarcasm
and snark and overstating the issue may make you feel better, but it
doesn't help people who are actually reading the bug for factual
information.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Chris Monahan]

Taylor - I agree. I have trusted automatic security updates for years. I
have to turn them off and start running updates manually because I can't
trust Ubuntu won't do this again.

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Taylor Otwell]

Is this the new norm for Ubuntu 14.04? Just restart your entire server
every night? This is the most ridiculous shit I have ever seen in my
life. When will this be fixed?

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Jeff Klink]

Agreed on this one, we're also experiencing production failures, but
they happen every night around 1am and simply restarting apache clears
it up.

>From our logs

Start-Date: 2017-03-21  03:22:40
Commandline: /usr/bin/unattended-upgrade
Upgrade: libc6-dev:amd64 (2.23-0ubuntu3, 2.23-0ubuntu6), libc6:amd64 
(2.23-0ubuntu3, 2.23-0ubuntu6), locales:amd64 (2.23-0ubuntu3, 2.23-0ubuntu6), 
libc-bin:amd64 (2.23-0ubuntu3, 2.23-0ubuntu6), libc-dev-bin:amd64 
(2.23-0ubuntu3, 2.23-0ubuntu6), multiarch-support:amd64 (2.23-0ubuntu3, 
2.23-0ubuntu6)
End-Date: 2017-03-21  03:22:46

Start-Date: 2017-03-22  00:27:23
Commandline: /usr/bin/unattended-upgrade
Upgrade: libc6-dev:amd64 (2.23-0ubuntu6, 2.23-0ubuntu7), libc6:amd64 
(2.23-0ubuntu6, 2.23-0ubuntu7), locales:amd64 (2.23-0ubuntu6, 2.23-0ubuntu7), 
libc-bin:amd64 (2.23-0ubuntu6, 2.23-0ubuntu7), libc-dev-bin:amd64 
(2.23-0ubuntu6, 2.23-0ubuntu7), multiarch-support:amd64 (2.23-0ubuntu6, 
2.23-0ubuntu7)
End-Date: 2017-03-22  00:27:29

We believe that the unattended upgrade updated and killed us RIGHT
around the same time, thus needing the apache restart.  2 nights in a
row we found these failures, and 2 libc upgrades at the same time.

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Title:
  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[rmuch]

Experienced this issue when it brought down production services yesterday,
manifesting itself as the PHP issue described in #1674733. 

A reboot temporarily solved the problem but then it reoccurred approximately 18
hours later.

I'm currently unable to provide reproduction steps other than it seems to affect
long-running processes.

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Title:
  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[thecyborgus]

I'm still seeing this on Ubuntu 16.04 connecting to Amazon RDS as well.

Apache service reloads had temporarily resolved it, but I got a huge
rash of these again across all of my servers during the Unattended
installs again last night.


Start-Date: 2017-03-21  04:30:58
Commandline: /usr/bin/unattended-upgrade
Upgrade: libc6-dev:amd64 (2.23-0ubuntu3, 2.23-0ubuntu6), libc6:amd64 
(2.23-0ubuntu3, 2.23-0ubuntu6), locales:amd64 (2.23-0ubuntu3, 2.23-0ubuntu6), 
libc-bin:amd64 (2.23-0ubuntu3, 2.23-0ubuntu6), libc-dev-bin:amd64 
(2.23-0ubuntu3, 2.23-0ubuntu6), multiarch-support:amd64 (2.23-0ubuntu3, 
2.23-0ubuntu6), libfreetype6:amd64 (2.6.1-0.1ubuntu2, 2.6.1-0.1ubuntu2.1)
End-Date: 2017-03-21  04:31:02

Start-Date: 2017-03-22  03:53:14
Commandline: /usr/bin/unattended-upgrade
Upgrade: libc6-dev:amd64 (2.23-0ubuntu6, 2.23-0ubuntu7), libc6:amd64 
(2.23-0ubuntu6, 2.23-0ubuntu7), locales:amd64 (2.23-0ubuntu6, 2.23-0ubuntu7), 
libc-bin:amd64 (2.23-0ubuntu6, 2.23-0ubuntu7), libc-dev-bin:amd64 
(2.23-0ubuntu6, 2.23-0ubuntu7), multiarch-support:amd64 (2.23-0ubuntu6, 
2.23-0ubuntu7)
End-Date: 2017-03-22  03:53:18

I rebooted after the error cropped up and it worked for about 8 or 9
hours before it happened again on the same servers.

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Title:
  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Harry Wiles]

14.04
Reboot temporarily fixed issue for a few hours, but has resurfaced since.

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Sean Leach]

I'm also seeing this issue replicated on 14.04.2 -

$ apt-cache show libc6 | grep Version
Version: 2.19-0ubuntu6.11
Version: 2.19-0ubuntu6

$cat /var/log/apt/history.log

...
Start-Date: 2017-03-21 07:11:13
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 07:11:31
...

Note some people suggesting a reboot will fix - in my case a reboot did
not permanently fix the issue, but did give me around 18 hours of
stability before performance was too poor to serve operationally.

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Roberts]

@Adam C.: Thx!

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Adam Conrad]

@robertsv: As mentioned in other comments, just reboot.  You'll be fine
from there.

@fariazz: If you're on 15.04, you're not seeing this bug.  Also, 15.04
has been out of support for over a year.

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[fariazz]

My bad, I'm in 15.04.

Any workaround to make things work again?

This is causing severe problems on our end so any advise would be
welcome.

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Roberts]

Same issue on  Ubuntu 14.X LTS
After auto upgrade on 2017.03.21 application running on apache and php is 
unable some times to connect to db server.
Upgrade log:
Preparing to unpack .../libc6_2.19-0ubuntu6.10_amd64.deb ...
Unpacking libc6:amd64 (2.19-0ubuntu6.10) over (2.19-0ubuntu6.9) ...

Upgrade on 2017.03.22 did not help
Upgrade log:
Preparing to unpack .../libc6_2.19-0ubuntu6.11_amd64.deb ...
Unpacking libc6:amd64 (2.19-0ubuntu6.11) over (2.19-0ubuntu6.10) ...

Is there an estimated time for fixing libc6 issue for Ubuntu 14.X LTS?

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[fariazz]

I'm having this problem in 14.04 since yesterday, where all my DNS
resolutions take forever, some timeout. I've restarted several times.

This has broken many integrations in our site, is there anything that
can be done to make things work?

This is the version of libc6 that I have:

dpkg -s libc6
Package: libc6
Status: install ok installed
Priority: required
Section: libs
Installed-Size: 10568
Maintainer: Ubuntu Developers 
Architecture: amd64
Multi-Arch: same
Source: glibc
Version: 2.21-0ubuntu4
Replaces: libc6-amd64
Depends: libgcc1
Suggests: glibc-doc, debconf | debconf-2.0, locales
Breaks: hurd (<< 1:0.5.git20140203-1), libtirpc1 (<< 0.2.3), lsb-core (<= 
3.2-27), nscd (<< 2.21)
Conflicts: prelink (<= 0.0.20090311-1), tzdata (<< 2007k-1), tzdata-etch
Conffiles:
 /etc/ld.so.conf.d/x86_64-linux-gnu.conf 593ad12389ab2b6f952e7ede67b8fbbf
Description: GNU C Library: Shared libraries
 Contains the standard libraries that are used by nearly all programs on
 the system. This package includes shared versions of the standard C library
 and the standard math library, as well as many others.
Homepage: http://www.gnu.org/software/libc/libc.html
Original-Maintainer: GNU Libc Maintainers 

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Adam Conrad]

"Again, the question is what else needs to be restarted?"

The answer to that is "I don't know", which is why the general
recommendation here should be to just reboot.  Basically, any long-
running process with the older libc loaded that tries to do NSS DNS
lookups will fail.  This was the bug introduced in the previous update,
and reverted in this, but of course, the revert will have the same
effect as the original update if you upgraded and restarted with the
interim libc.

Again, this sucks, but there's no sane way to both revert the ABI break
and make it smooth for the people who restarted services (or the
machine) with the bad update in between.

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  glibc update caused NSS ABI break

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[Bug 1674532] Re: glibc update caused NSS ABI break

[Adam Conrad]

** Summary changed:

- Ubuntu 14.04 broken during PXE boot
+ glibc update caused NSS ABI break

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