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

[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

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

[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

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

[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

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

[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

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

[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

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

[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

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

[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

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

[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

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

[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

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

[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

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

[Brian Murray]

** Tags added: rls-bb-incoming

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

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

[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

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Dimitri John Ledkov]

avahi is zeroconf or IPv4LL, which is RFC 3927; whilst LLMNR is RFC
4795. In many aspects LLMNR is like mdns, yet the two are distinct and
resolve different things quite differently, when inspected closer.


** Changed in: systemd (Ubuntu)
   Status: Confirmed => Triaged

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Mike Pontillo]

Workaround:

grep -q 'LLMNR=no' /etc/systemd/resolved.conf || \
echo 'LLMNR=no' | sudo tee -a /etc/systemd/resolved.conf
sudo service systemd-networkd restart

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Joseph Salisbury]

** Tags removed: kernel-da-key

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Mike Pontillo]

Interesting; the first thing I tried when triaging this was to edit
/etc/nsswitch.conf as follows:

# hosts:  files mdns4_minimal [NOTFOUND=return] dns myhostname
hosts:  files dns

... to eliminate the possibility that it was multicast DNS causing the
slowdown. But it appears I'm behind the times. ;-) (And didn't this only
affect the .local domain?)

Does this mean there are now two subsystems responsible for link-local
address resolution? (avahi and systemd-resolved?)

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Dimitri John Ledkov]

$ time systemd-resolve -p dns not-a-real-hostname
not-a-real-hostname: resolve call failed: No appropriate name servers or 
networks for name found

real0m0.003s
user0m0.000s
sys 0m0.004s

$ time systemd-resolve -p llmnr not-a-real-hostname
not-a-real-hostname: resolve call failed: All attempts to contact name servers 
or networks failed

real0m0.850s
user0m0.000s
sys 0m0.004s

$ time systemd-resolve -p llmnr-ipv4 not-a-real-hostname
not-a-real-hostname: resolve call failed: All attempts to contact name servers 
or networks failed

real0m0.820s
user0m0.000s
sys 0m0.000s

$ time systemd-resolve -p llmnr-ipv6 not-a-real-hostname
not-a-real-hostname: resolve call failed: All attempts to contact name servers 
or networks failed

real0m0.750s
user0m0.000s
sys 0m0.000s

$ time systemd-resolve not-a-real-hostname
not-a-real-hostname: resolve call failed: All attempts to contact name servers 
or networks failed

real0m0.712s
user0m0.004s
sys 0m0.000s

The dns resolution from systemd-resolve is fast; the llmnr one is not.
We currently have llmnr resolution enabled by default. ...it's a
feature?!

What is the usecase of resolving things that do not exist? Surely we
optimise for the fact that most resolutions will succeed, from
performance point of view. The first result retrieved, is returned back.

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Steve Langasek]

> The dns resolution from systemd-resolve is fast; the llmnr one is not.
> We currently have llmnr resolution enabled by default. ...it's a feature?!

It is not a feature for a local DNS resolver to be doing llmnr under the
hood by default.  Please disable this.

> What is the use case of resolving things that do not exist?

DNS search paths.
User typoed the name and shouldn't have to wait 10 seconds for the response.

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Steve Langasek]

** Changed in: systemd (Ubuntu)
   Importance: Undecided => High

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Blake Rouse]

** Changed in: systemd (Ubuntu)
   Status: New => Confirmed

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Blake Rouse]

The issue is with the systemd resolver not with glibc.

With systemd-resolve IP in /etc/resolv.conf:

# This file is managed by man:systemd-resolved(8). Do not edit.
#
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53

$ time ./test not-a-hostname
Trying to resolve: not-a-hostname
getaddrinfo errno: No such file or directory
getaddrinfo() return value: -2 (Name or service not known)

real0m10.076s
user0m0.001s
sys 0m0.000s


Without systemd-resolve in /etc/resolv.conf. I changed it to point to my local 
DNS server directly.

# This file is managed by man:systemd-resolved(8). Do not edit.
#
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
#nameserver 127.0.0.53
nameserver 192.168.1.1

$ time ./test not-a-hostname
Trying to resolve: not-a-hostname
getaddrinfo errno: No such file or directory
getaddrinfo() return value: -2 (Name or service not known)

real0m0.097s
user0m0.001s
sys 0m0.000s


** Changed in: glibc (Ubuntu)
   Status: New => Invalid

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Blake Rouse]

$ systemd-resolve --status
Global
  DNSSEC NTA: 10.in-addr.arpa
  16.172.in-addr.arpa
  168.192.in-addr.arpa
  17.172.in-addr.arpa
  18.172.in-addr.arpa
  19.172.in-addr.arpa
  20.172.in-addr.arpa
  21.172.in-addr.arpa
  22.172.in-addr.arpa
  23.172.in-addr.arpa
  24.172.in-addr.arpa
  25.172.in-addr.arpa
  26.172.in-addr.arpa
  27.172.in-addr.arpa
  28.172.in-addr.arpa
  29.172.in-addr.arpa
  30.172.in-addr.arpa
  31.172.in-addr.arpa
  corp
  d.f.ip6.arpa
  home
  internal
  intranet
  lan
  local
  private
  test

Link 8 (vethJWPPL8)
  Current Scopes: LLMNR/IPv6
   LLMNR setting: yes
MulticastDNS setting: no
  DNSSEC setting: no
DNSSEC supported: no

Link 4 (lxdbr0)
  Current Scopes: LLMNR/IPv4 LLMNR/IPv6
   LLMNR setting: yes
MulticastDNS setting: no
  DNSSEC setting: no
DNSSEC supported: no

Link 3 (eno1)
  Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6
   LLMNR setting: yes
MulticastDNS setting: no
  DNSSEC setting: no
DNSSEC supported: no
 DNS Servers: 192.168.1.1

Link 2 (enp4s0)
  Current Scopes: none
   LLMNR setting: yes
MulticastDNS setting: no
  DNSSEC setting: no
DNSSEC supported: no

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Blake Rouse]

$ time ./test not-a-real-hostname
Trying to resolve: not-a-real-hostname
getaddrinfo errno: No such file or directory
getaddrinfo() return value: -2 (Name or service not known)

real0m10.007s
user0m0.001s
sys 0m0.001s

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Mike Pontillo]

** Tags added: bionic

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  Regression in getaddrinfo(): calls block for much longer on Bionic
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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Mike Pontillo]

** Description changed:

  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
+ $ 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)
+ 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)
+ 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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https://bugs.launchpad.net/bugs/1739672

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Mike Pontillo]

I just tested with the Xenial kernel and Bionic userspace and observed
that the bug still occurs, so marked Invalid for 'linux'.

** Changed in: linux (Ubuntu)
   Status: Incomplete => Invalid

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Joseph Salisbury]

One way to tell if this bug is due to the kernel, is to boot with some
prior kernel versions and see if the bug goes away.

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-da-key

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

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[Bug 1739672] Re: Regression in getaddrinfo(): calls block for much longer on Bionic (compared to Xenial)

[Mike Pontillo]

Note: I doubt this bug is in the kernel itself; I initially attempted to
file it under glibc at first, but for some reason the `linux` package
was selected.

I also added `systemd` in case the difference in behavior can be
explained by the addition of resolved.

Note that these tests were run on Bionic Desktop, so it's using network-
manager, not networkd.

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

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