subject:"\[Kernel\-packages\] \[Bug 1739672\] Re\: Regression in getaddrinfo\(\)\: calls block for much longer on Bionic \(compared to Xenial\), please disable LLMNR"

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-04-10 Thread Ryan Harper

ubuntu@foufoune:~$ lsb_release -rd
Description:Ubuntu 17.10
Release:17.10
ubuntu@foufoune:~$ apt-cache policy systemd
systemd:
  Installed: 234-2ubuntu12.3
  Candidate: 234-2ubuntu12.3
  Version table:
 *** 234-2ubuntu12.3 500
500 http://azure.archive.ubuntu.com/ubuntu artful-updates/main amd64 
Packages
100 /var/lib/dpkg/status
 234-2ubuntu12.1 500
500 http://security.ubuntu.com/ubuntu artful-security/main amd64 
Packages
 234-2ubuntu12 500
500 http://azure.archive.ubuntu.com/ubuntu artful/main amd64 Packages


ubuntu@foufoune:~$ time ping  __cloud_init_expected_not_found
ping: __cloud_init_expected_not_found: Temporary failure in name resolution

real0m15.016s
user0m0.000s
sys 0m0.003s

After applying the workaround from comment #11, I see fast lookups
again.

ubuntu@foufoune:~$ cat /etc/systemd/resolved.conf 
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See resolved.conf(5) for details

[Resolve]
#DNS=
#FallbackDNS=
#Domains=
#LLMNR=yes
#MulticastDNS=yes
#DNSSEC=no
#Cache=yes
#DNSStubListener=udp
LLMNR=no

ubuntu@foufoune:~$ time ping  __cloud_init_expected_not_found
ping: __cloud_init_expected_not_found: Name or service not known

real0m0.006s
user0m0.000s
sys 0m0.001s

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Released
Status in glibc source package in Artful:
  New
Status in linux source package in Artful:
  New
Status in systemd source package in Artful:
  New
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-04-10 Thread Ryan Harper

I'm seeing this on Artful as well, in Azure cloud.

** Also affects: glibc (Ubuntu Artful)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Artful)
   Importance: Undecided
   Status: New

** Also affects: systemd (Ubuntu Artful)
   Importance: Undecided
   Status: New

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Released
Status in glibc source package in Artful:
  New
Status in linux source package in Artful:
  New
Status in systemd source package in Artful:
  New
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-02-24 Thread Launchpad Bug Tracker

This bug was fixed in the package systemd - 237-3ubuntu3

---
systemd (237-3ubuntu3) bionic; urgency=medium

  * tests/control: drop qemu-system-ppc.
Whilst some tests pass, many regress / fail to boot. This is not a 
regression,
as qemu-based tests were not run previously.

 -- Dimitri John Ledkov   Tue, 20 Feb 2018 17:40:02
+

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

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Released
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-02-15 Thread Francis Ginther

** Tags added: id-5a4e5d0285ca388b893cf09d

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Committed
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Fix Committed

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-02-09 Thread Dimitri John Ledkov

** Changed in: systemd (Ubuntu Bionic)
   Status: Triaged => Fix Committed

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Committed
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Fix Committed

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-02-08 Thread Dimitri John Ledkov

** Changed in: systemd (Ubuntu Bionic)
 Assignee: (unassigned) => Dimitri John Ledkov (xnox)

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Triaged

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-02-08 Thread Steve Langasek

** Tags removed: rls-bb-incoming

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Triaged

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-02-08 Thread Steve Langasek

** Also affects: glibc (Ubuntu Bionic)
   Importance: Undecided
   Status: Invalid

** Also affects: linux (Ubuntu Bionic)
   Importance: High
   Status: Invalid

** Also affects: systemd (Ubuntu Bionic)
   Importance: High
   Status: Triaged

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged
Status in glibc source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Invalid
Status in systemd source package in Bionic:
  Triaged

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-01-17 Thread Dimitri John Ledkov

yes, but I'm not uploading systemd until after the build-farm is open.

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-01-17 Thread Scott Moser

Hi,

I'm coming here from bug 1730744.
Is this bug expected to be fixed for 18.04?

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Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-01-05 Thread Brian Murray

** Tags added: rls-bb-incoming

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https://bugs.launchpad.net/bugs/1739672

Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

2018-01-04 Thread Dimitri John Ledkov

** Summary changed:

- Regression in getaddrinfo(): calls block for much longer on Bionic (compared 
to Xenial)
+ Regression in getaddrinfo(): calls block for much longer on Bionic (compared 
to Xenial), please disable LLMNR

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1739672

Title:
  Regression in getaddrinfo(): calls block for much longer on Bionic
  (compared to Xenial), please disable LLMNR

Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  When testing MAAS on Bionic, we noticed sluggish performance that we
  could not immediately explain.

  After comparing the results from a run of the test suite on Xenial to
  a run on Bionic, we determined that the slowdowns had to do with DNS
  lookups. In particular, if MAAS attempts to resolve a hostname using
  getaddrinfo() and the call fails, on Xenial the negative result is
  returned in a fraction of a second. On Bionic, the negative result is
  returned in ~1.6 seconds, according to some measures.

  ### To run the test ###

  git clone https://github.com/mpontillo/test-getaddrinfo
  cd test-getaddrinfo
  make

  ### Results on Xenial ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Success
  getaddrinfo() return value: -2 (Name or service not known)

  real  0m0.015s
  user  0m0.000s
  sys   0m0.000s

  ### Results on Bionic ###
  $ time ./test not-a-real-hostname
  Trying to resolve: not-a-real-hostname
  getaddrinfo errno: Resource temporarily unavailable
  getaddrinfo() return value: -3 (Temporary failure in name resolution)

  real  0m1.609s
  user  0m0.004s
  sys   0m0.000s

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1739672/+subscriptions

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[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

[Kernel-packages] [Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial), please disable LLMNR

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