subject:"\[Bug 1591411\] Re\: systemd\-logind must be restarted every \~1000 SSH logins to prevent a \~25 second delay"

[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2019-08-22 Thread Nick Adams

@Ioanna

~25 second delay when connecting via SSH

Happens most often during ansible playbook runs, wherein a single ssh
connection is established, but multiple new sessions are created within
that connection. Usually only happens on the 3rd or 4th run after a
reboot. There are hundreds of leftover scopes after an ansible playbook
run and subsequent disconnection:

# ls -ld /run/systemd/transient/session-*.scope* | wc -l
344

# systemd --version
systemd 237
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP 
+GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 
default-hierarchy=hybrid

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  systemd-logind must be restarted every ~1000 SSH logins to prevent a
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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2019-08-21 Thread Ioanna Alifieraki

@Nick

What symptoms do you observe? Delays when ssh?
Could you please share your reproducer or describe in which circumstances you 
hit the bug?
Do you see any leaking scopes "ls -ld /run/systemd/transient/session-*.scope*" ?
Lastly what version of systemd do you run?

Thanks.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2019-07-17 Thread Nick Adams

This still seems to be an issue. Running latest Bionic.

# dpkg -s dbus | grep Version
Version: 1.12.2-1ubuntu1.1

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2019-05-16 Thread Bug Watch Updater

** Changed in: systemd
   Status: Unknown => Fix Released

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-10-29 Thread William Van Hevelingen

This bug does not appear to be resolved on Xenial as we are seeing scope
file leakage causing systemctl to hang.

We are running the version of dbus that contains the fix

# dpkg -s dbus | grep Version
Version: 1.10.6-1ubuntu3.3

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-09-18 Thread Drew Freiberger

Trusty versions of packages affected (I see there is a systemd update
229-4ubuntu19.  Does this include the backported fixes from v230/v231
mentioned in comment #4?):

ii  dbus 1.10.6-1ubuntu3.1  
amd64simple interprocess messaging system (daemon and utilities)
ii  libdbus-1-3:amd641.10.6-1ubuntu3.1  
amd64simple interprocess messaging system (library)
ii  libdbus-glib-1-2:amd64   0.106-1
amd64simple interprocess messaging system (GLib-based shared library)
ii  python3-dbus 1.2.0-3
amd64simple interprocess messaging system (Python 3 interface)
ii  libpam-systemd:amd64 229-4ubuntu12  
amd64system and service manager - PAM module
ii  libsystemd0:amd64229-4ubuntu12  
amd64systemd utility library
ii  python3-systemd  231-2build1
amd64Python 3 bindings for systemd
ii  systemd  229-4ubuntu12  
amd64system and service manager
ii  systemd-sysv 229-4ubuntu12  
amd64system and service manager - SysV links

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-09-18 Thread Drew Freiberger

** Tags added: canonical-bootstack canonical-is

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-09-18 Thread Drew Freiberger

Can we get this backported to trusty?

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-07-10 Thread Łukasz Zemczak

Since no one is able to verify the yakkety version of this SRU for so
long, I am dropping the dbus version with the fix for the bug from
yakkety-proposed.

** Changed in: dbus (Ubuntu Yakkety)
   Status: Fix Committed => Won't Fix

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-06-01 Thread Łukasz Zemczak

Anyone else can reproduce the issue on yakkety as-is and can test the
-proposed dbus packages? They're a bit stuck in -proposed for too long.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-04-06 Thread Bug Watch Updater

** Changed in: dbus
   Status: Unknown => Fix Released

** Changed in: dbus
   Importance: Unknown => Medium

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-24 Thread Dr. Jens Rosenboom

I've tried to reproduce this on a yakkety cloud instance as well as with
lxc for some time, but sadly with no success. So I'm not sure whether
this is still present in yakkety at all.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-23 Thread Łukasz Zemczak

A re-poke - could anyone with a yakkety system test the new dbus package
in -proposed? I would like it to make its way to yakkety-proposed as
well if possible. Thanks!

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-17 Thread Launchpad Bug Tracker

This bug was fixed in the package dbus - 1.10.6-1ubuntu3.3

---
dbus (1.10.6-1ubuntu3.3) xenial; urgency=medium

  * debian/dbus.user-session.upstart:
- Temporarily revert latest changes as those seem to cause issues in the
  unity8 session on touch (LP: #1654241).

 -- Łukasz 'sil2100' Zemczak   Thu, 12 Jan
2017 19:01:21 +0100

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

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  systemd-logind must be restarted every ~1000 SSH logins to prevent a
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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-16 Thread Dave Chiluk

@jan-huebner

Please educate yourself about the stable release process and development process
https://wiki.ubuntu.com/StableReleaseUpdates
https://wiki.ubuntu.com/UbuntuDevelopment

A regression was discovered in another component.  This is the reason
for the delay.  This is very uncommon, but also the entire reason for
the SRU process.

If you are capable of contributing in a development manner, I will
gladly mentor you or help find a mentor for you.  Contributing solutions
is the best way to help speed fixes for which you may care about in the
open-source world.

As it sounds as though you are using in production in a mission critical 
application perhaps you'd consider financially supporting the project by 
purchasing a support contract, or donating when you download.
https://buy.ubuntu.com/

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-13 Thread Jan Hübner

Thanks for your quick reply. I don't want to sound harsh or be the guy
who is always complaining, but this is just so annoying. I can't test
packages on production servers or run "testing" packages on them, even
if known good, when it's company policy to only run stable/official
packages (especially when it's a LTS release).

And be honest: how much more basic from a user/admin perspective than
"SSH is working" can it get?

So: sorry for my "outburst" - I felt better afterwards ;) - and
obviously something is moving again :)

Kind regards,
Jan

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-13 Thread Łukasz Zemczak

This takes much too longer than expected, it was supposed to migrate
long time already. All because of that additional fix that got attached
by another developer which caused some regression somewhere in another
component *sigh*. I re-uploaded a new dbus to xenial-proposed with the
other fix reverted (so only having our logind workaround). Will now make
sure that this one migrates ASAP (trying to get it in now).

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-13 Thread Jan Hübner

Oh come on, I monitor machines via SSH remote execution of scripts -
Icinga logs in every minute. You might get the picture in regard to this
bug. We're waiting for six month now. How should anyone take Ubuntu
serious anymore? *sadface*

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-10 Thread Łukasz Zemczak

The packages are still stuck in -proposed for xenial as there seems to
be an issue with another patch that was released alongside of our fix.
Until that's resolved we can't really do much...

In the meantime, is there anyone with a yakkety device that could test
the yakkety-proposed packages as well?

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-09 Thread Florian Bogner

Hi there,

applying the given DBUS package from PROPOSED on 16.04 LTS as described
above solved the issue for us as well.

Thanks for all the work involved.

Best regards,

Florian

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2017-01-04 Thread Keith Pawson

Hello

We are running Gitlab on 16.04 LTS and had this issue which was really
causing a lot of frustrations. I was waiting for the update to go
through for about a month now and decided to apply this updated version.
After applying it via proposed repository it has solved the issue for us
as well.

This must be affecting many others out there as well.

Anyway, thank you so much for making this available and hopefully they
will release it soon.

Cheers
Keith

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-22 Thread Dave Chiluk

@Lukasz 
Looking good so far.  Appears resolved with 1.10.6-1ubuntu3.2.

Thanks,
Dave.

** Tags removed: verification-needed
** Tags added: verification-done

** Tags removed: verification-done
** Tags added: verification-done-xenial

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-19 Thread Łukasz Zemczak

@Kai-Heng
Thanks for giving those a spin, that's really good news! Would be good if we 
got a few more people testing those - this way we could revert the workaround 
and get the real fix released both upstream and downstream.

@Laurent
Thank you for testing the xenial package!

Are there any yakkety users around that could potentially give the dbus
package a try as well? We could then switch the bug to verification-done
and get both of them released into the updates pocket.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-16 Thread Laurent Perrin

Hello,

I just tested the package from Xenial proposed repository and it solved
the issue for us.

Here is the version of the package dbus: 1.10.6-1ubuntu3.2

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-16 Thread Timo Aaltonen

Hello Mike, or anyone else affected,

Accepted dbus into yakkety-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/dbus/1.10.10-1ubuntu1.2 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: dbus (Ubuntu Yakkety)
   Status: In Progress => Fix Committed

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-16 Thread Timo Aaltonen

Hello Mike, or anyone else affected,

Accepted dbus into xenial-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/dbus/1.10.6-1ubuntu3.2
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: dbus (Ubuntu Xenial)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-14 Thread Kai-Heng Feng

Hi Lukasz,

I found this issue when I use `systemd suspend` several hundred times.
I can confirm that the dbus package with 'proper fix' in the PPA fixes the 
issue for my case.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-13 Thread Łukasz Zemczak

Hello Stan! The dbus packages for xenial and yakkety have been uploaded
a long time ago (on the 25th of November actually) but are currently
still sitting in the UNAPPROVED queue for each release. I'll poke the
SRU team to take a look at those as soon as possible. I didn't expect
this to take so long.

In the meantime, could someone please test the new packages with the new
'proper' proposed fix (as per my PPA above)? This would help upstream in
getting rid of the issue without using just this workaround.

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-12-12 Thread Stan Hu

Lukasz, could we get an updated release for Ubuntu 16.04 (xenial)? We're
finding that the latest kernel updates are overwriting our custom dbus
packages, and we would prefer to have an official release soon. Thank
you!

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-25 Thread Łukasz Zemczak

** Changed in: dbus (Ubuntu Xenial)
   Status: Confirmed => In Progress

** Changed in: dbus (Ubuntu Yakkety)
   Status: Confirmed => In Progress

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-18 Thread Jan Hübner

I just had the chance to add the PPA and install the package. Rebooted
the machine and will report. Ubuntu 16.04.1 LTS.

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-16 Thread Łukasz Zemczak

While the workaround is being prepared to get SRUed to the stable
releases, I prepared the dbus packages with the two patches Simon
proposed for testing.

https://launchpad.net/~sil2100/+archive/ubuntu/ppa

Could anyone that was able to reproduce the original issue install the
dbus packages from the above PPA and re-try the tests to see if the
issue is reproducible? The following packages have the workaround
reverted and the two requested patches applied. I prepared both xenial
and zesty packages in the PPA for testing purposes.

Thanks!

** Description changed:

  [Impact]
  
  The bug affects multiple users and introduces an user visible delay (~25
  seconds) on SSH connections after a large number of sessions have been
  processed. This has a serious impact on big systems and servers running
  our software.
  
  The currently proposed fix is actually a safe workaround for the bug as
  proposed by the dbus upstream. The workaround makes uid 0 immune to the
  pending_fd_timeout limit that kicks in and causes the original issue.
  
  [Test Case]
  
- .
+ lxc launch ubuntu:x test
+ lxc exec test -- login -f ubuntu
+ ssh-import-id 
+ 
+ Then ran a script as follows (passing in ubuntu@):
+ 
+ while [ 1 ]; do
+ (time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
+ done
+ 
+ Then checking the log file if there are any ssh sessions that are taking
+ 25+ seconds to complete.
+ 
+ Multiple instances of the same script can be used at the same time.
  
  [Regression Potential]
  
  The fix has a rather low regression potential as the workaround is a
  very small change only affecting one particular case - handling of uid
  0. The fix has been tested by multiple users and has been around in
  zesty for a while, with multiple people involved in reviewing the
  change. It's also a change that has been proposed by upstream.
- 
  
  [Original Description]
  
  I noticed on a system that accepts large numbers of SSH connections that
  after awhile, SSH sessions were taking ~25 seconds to complete.
  
  Looking in /var/log/auth.log, systemd-logind starts failing with the
  following:
  
  Jun 10 23:55:28 test sshd[3666]: pam_unix(sshd:session): session opened for 
user ubuntu by (uid=0)
  Jun 10 23:55:28 test systemd-logind[105]: New session c1052 of user ubuntu.
  Jun 10 23:55:28 test systemd-logind[105]: Failed to abandon session scope: 
Transport endpoint is not connected
  Jun 10 23:55:28 test sshd[3666]: pam_systemd(sshd:session): Failed to create 
session: Message recipient disconnected from message bus without replying
  
  I reproduced this in an LXD container by doing something like:
  
  lxc launch ubuntu:x test
  lxc exec test -- login -f ubuntu
  ssh-import-id 
  
  Then ran a script as follows (passing in ubuntu@):
  
  while [ 1 ]; do
  (time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
  done
  
  In my case, after 1052 logins, the 1053rd and thereafter were taking 25+
  seconds to complete. Here are some snippets from the log file:
  
  $ cat log | grep 0m0 | wc -l
  1052
  
  $ cat log | grep 0m25 | wc -l
  4
  
  $ tail -5 log
  real  0m0.222s
  real  0m25.232s
  real  0m25.235s
  real  0m25.236s
  real  0m25.239s
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: systemd 229-4ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Sat Jun 11 00:09:34 2016
  MachineType: Notebook W230SS
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → 
/lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/systemd-timesyncd.service → 
/lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
  
   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W230SS
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W230SS
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-15 Thread Łukasz Zemczak

** Description changed:

+ [Impact]
+ 
+ The bug affects multiple users and introduces an user visible delay (~25
+ seconds) on SSH connections after a large number of sessions have been
+ processed. This has a serious impact on big systems and servers running
+ our software.
+ 
+ The currently proposed fix is actually a safe workaround for the bug as
+ proposed by the dbus upstream. The workaround makes uid 0 immune to the
+ pending_fd_timeout limit that kicks in and causes the original issue.
+ 
+ [Test Case]
+ 
+ .
+ 
+ [Regression Potential]
+ 
+ The fix has a rather low regression potential as the workaround is a
+ very small change only affecting one particular case - handling of uid
+ 0. The fix has been tested by multiple users and has been around in
+ zesty for a while, with multiple people involved in reviewing the
+ change. It's also a change that has been proposed by upstream.
+ 
+ 
+ [Original Description]
+ 
  I noticed on a system that accepts large numbers of SSH connections that
  after awhile, SSH sessions were taking ~25 seconds to complete.
  
  Looking in /var/log/auth.log, systemd-logind starts failing with the
  following:
  
  Jun 10 23:55:28 test sshd[3666]: pam_unix(sshd:session): session opened for 
user ubuntu by (uid=0)
  Jun 10 23:55:28 test systemd-logind[105]: New session c1052 of user ubuntu.
  Jun 10 23:55:28 test systemd-logind[105]: Failed to abandon session scope: 
Transport endpoint is not connected
  Jun 10 23:55:28 test sshd[3666]: pam_systemd(sshd:session): Failed to create 
session: Message recipient disconnected from message bus without replying
  
  I reproduced this in an LXD container by doing something like:
  
  lxc launch ubuntu:x test
  lxc exec test -- login -f ubuntu
  ssh-import-id 
  
  Then ran a script as follows (passing in ubuntu@):
  
  while [ 1 ]; do
  (time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
  done
  
  In my case, after 1052 logins, the 1053rd and thereafter were taking 25+
  seconds to complete. Here are some snippets from the log file:
  
  $ cat log | grep 0m0 | wc -l
  1052
  
  $ cat log | grep 0m25 | wc -l
  4
  
  $ tail -5 log
  real  0m0.222s
  real  0m25.232s
  real  0m25.235s
  real  0m25.236s
  real  0m25.239s
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: systemd 229-4ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Sat Jun 11 00:09:34 2016
  MachineType: Notebook W230SS
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → 
/lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/systemd-timesyncd.service → 
/lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
  
   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W230SS
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W230SS
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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Re: [Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-14 Thread Pablo Carranza

We can try the proposed patched version in one worker at gitlab. It will
get stressed quite fast

On Nov 14, 2016 13:25, "Łukasz Zemczak" <1591...@bugs.launchpad.net>
wrote:

> @Shay: yes, we will prepare an SRU to the currently supported series
> soon - but please note that the current 'fix' is, in fact, just a
> workaround. But it works.
>
> @Simon: I can try finding some people that could reproduce this easily,
> prepare patched-up version of dbus with both the proposed fixes and ask
> them to run tests on them. Would be really cool if a real fix could be
> found this way. I'll take care of this this week and send feedback here
> and the upstream bug.
>
> Thanks again for looking into this further Simon!
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1591411
>
> Title:
>   systemd-logind must be restarted every ~1000 SSH logins to prevent a
>   ~25 second delay
>
> Status in D-Bus:
>   Unknown
> Status in systemd:
>   Unknown
> Status in dbus package in Ubuntu:
>   Fix Released
> Status in systemd package in Ubuntu:
>   Fix Released
> Status in dbus source package in Xenial:
>   Confirmed
> Status in systemd source package in Xenial:
>   Invalid
> Status in dbus source package in Yakkety:
>   Confirmed
> Status in systemd source package in Yakkety:
>   Invalid
>
> Bug description:
>   I noticed on a system that accepts large numbers of SSH connections
>   that after awhile, SSH sessions were taking ~25 seconds to complete.
>
>   Looking in /var/log/auth.log, systemd-logind starts failing with the
>   following:
>
>   Jun 10 23:55:28 test sshd[3666]: pam_unix(sshd:session): session opened
> for user ubuntu by (uid=0)
>   Jun 10 23:55:28 test systemd-logind[105]: New session c1052 of user
> ubuntu.
>   Jun 10 23:55:28 test systemd-logind[105]: Failed to abandon session
> scope: Transport endpoint is not connected
>   Jun 10 23:55:28 test sshd[3666]: pam_systemd(sshd:session): Failed to
> create session: Message recipient disconnected from message bus without
> replying
>
>   I reproduced this in an LXD container by doing something like:
>
>   lxc launch ubuntu:x test
>   lxc exec test -- login -f ubuntu
>   ssh-import-id 
>
>   Then ran a script as follows (passing in ubuntu@):
>
>   while [ 1 ]; do
>   (time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
>   done
>
>   In my case, after 1052 logins, the 1053rd and thereafter were taking
>   25+ seconds to complete. Here are some snippets from the log file:
>
>   $ cat log | grep 0m0 | wc -l
>   1052
>
>   $ cat log | grep 0m25 | wc -l
>   4
>
>   $ tail -5 log
>   real  0m0.222s
>   real  0m25.232s
>   real  0m25.235s
>   real  0m25.236s
>   real  0m25.239s
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 16.04
>   Package: systemd 229-4ubuntu5
>   ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
>   Uname: Linux 4.4.0-22-generic x86_64
>   ApportVersion: 2.20.1-0ubuntu2
>   Architecture: amd64
>   Date: Sat Jun 11 00:09:34 2016
>   MachineType: Notebook W230SS
>   ProcEnviron:
>TERM=xterm-256color
>PATH=(custom, no user)
>   ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic
> root=/dev/mapper/ubuntu--vg-root ro quiet splash
>   SourcePackage: systemd
>   SystemdDelta:
>[EXTENDED]   /lib/systemd/system/rc-local.service →
> /lib/systemd/system/rc-local.service.d/debian.conf
>[EXTENDED]   /lib/systemd/system/systemd-timesyncd.service →
> /lib/systemd/system/systemd-timesyncd.service.d/disable-
> with-time-daemon.conf
>
>2 overridden configuration files found.
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 04/15/2014
>   dmi.bios.vendor: American Megatrends Inc.
>   dmi.bios.version: 4.6.5
>   dmi.board.asset.tag: Tag 12345
>   dmi.board.name: W230SS
>   dmi.board.vendor: Notebook
>   dmi.board.version: Not Applicable
>   dmi.chassis.asset.tag: No Asset Tag
>   dmi.chassis.type: 9
>   dmi.chassis.vendor: Notebook
>   dmi.chassis.version: N/A
>   dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:
> svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:
> rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
>   dmi.product.name: W230SS
>   dmi.product.version: Not Applicable
>   dmi.sys.vendor: Notebook
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/dbus/+bug/1591411/+subscriptions
>

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-14 Thread Łukasz Zemczak

@Shay: yes, we will prepare an SRU to the currently supported series
soon - but please note that the current 'fix' is, in fact, just a
workaround. But it works.

@Simon: I can try finding some people that could reproduce this easily,
prepare patched-up version of dbus with both the proposed fixes and ask
them to run tests on them. Would be really cool if a real fix could be
found this way. I'll take care of this this week and send feedback here
and the upstream bug.

Thanks again for looking into this further Simon!

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-13 Thread Shay

Will fix, 1.10.10-1ubuntu2, enter 16.04 LTS?

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-11 Thread Simon McVittie

... er, that should be, I have some more ideas for testing on
.

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-11 Thread Simon McVittie

If you can reproduce this issue and you have an expendable machine or
container to test it on, I have some more ideas on Bug #95263.

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-11 Thread Simon McVittie

I have not been able to reproduce this on a Debian (jessie or sid) or
Ubuntu (xenial) virtual machine prepared according to the instructions
in autopkgtest-virt-qemu(1), even after reducing the pending_fd_timeout
limit from 15 (2.5 minutes) to 150 (150ms) with this configuration
in /etc/dbus-1/system-local.conf:


  150


This is with 4 parallel loops repeatedly logging in via ssh, currently
at around 280 logins each.

Is there something special that is needed in the OS image to exhibit
this failure mode?

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-07 Thread Łukasz Zemczak

** Changed in: dbus (Ubuntu Yakkety)
 Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: dbus (Ubuntu Yakkety)
   Importance: Undecided => Medium

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-11-04 Thread Launchpad Bug Tracker

This bug was fixed in the package dbus - 1.10.10-1ubuntu2

---
dbus (1.10.10-1ubuntu2) zesty; urgency=medium

  * debian/patches/make-uid-0-immune-to-timeout.patch:
- Add a test patch proposed by Simon McVittie upstream to fix bug
  LP: #1591411.

 -- Łukasz 'sil2100' Zemczak   Tue, 11 Oct
2016 20:12:43 +0200

** Changed in: dbus (Ubuntu)
   Status: Confirmed => Fix Released

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-21 Thread Łukasz Zemczak

I think I will just go forward and start preparing the release of dbus
with this fix in zesty and then backporting it to yakkety and xenial.
Upstream didn't seem to officially review the fix or provide any
feedback on our test results, but the fix is enough high-priority to
consider including it anyway. I will of course get someone to review all
this, but I suppose we'll be pushing upstream about it separately.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-21 Thread Łukasz Zemczak

** Also affects: dbus (Ubuntu Yakkety)
   Importance: Undecided
   Status: New

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

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

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

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-19 Thread Ben Parafina

Tested with Ubuntu Xenial, after using Mike Pontillo's While loop
hammering 16x in parallel I couldn't reproduce after installing the
modified dbus package.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-13 Thread autostatic

Tested with an Openstack 16.04 instance and having Mike Pontillo's while
loop hammering ten times in parallel on it. With dbus 1.10.6-1ubuntu3 I
quickly got logins taking about 25 seconds, after having installed the
dbus package from the sil2100 PPA I couldn't reproduce the issue
anymore.

Jeremy

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-13 Thread Łukasz Zemczak

** Changed in: dbus (Ubuntu Xenial)
 Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: dbus (Ubuntu)
 Assignee: (unassigned) => Łukasz Zemczak (sil2100)

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-13 Thread Łukasz Zemczak

Excellent, let me forward these comments to the upstream bug. We'll
still wait for a few more people to test it out with this change applied
and then try to release it to the latest series + back-porting to xenial
at least. Of course we can do that instantly once upstream accepts the
patch, but I'm sure they'll like some real world feedback as well.

Thanks for testing!

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-13 Thread Finn Herpich

I can confirm too that Łukasz latest version fixes the bug for me.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-11 Thread Ivan Kozik

It works fine with the new test package in your PPA.  I ran an SSH login
flood for 10 minutes and didn't see systemd-logind fall over.  I then
purged the PPA and confirmed it was still broken without the test
package (it dies after about 2 minutes / 5000 logins).

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-11 Thread Łukasz Zemczak

I have prepared another xenial dbus package in my PPA containing the
second WIP proposed fix from the upstream bug [1]. If you could give a
try on reproducing the issue using dbus 1.10.6-1ubuntu3.1~test2 from
this place, I would be grateful:

https://launchpad.net/~sil2100/+archive/ubuntu/ppa

Same as with the previous package, there is no guarantee this will help.
It's one of the proposed changes to make the situation better as per the
upstream developers, who would be very welcome on some feedback.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-10-05 Thread Łukasz Zemczak

Sadly upstream still didn't agree on a concrete fix, as the one that was
confirmed as working was actually reintroducing a security
vulnerability. We tried one of the other proposed fixes but it didn't
seem to help. I'll try to push a new dbus version with another of the
proposed fixes, but there has been no notable movement on the original
upstream bug since long [1].

[1] https://bugs.freedesktop.org/show_bug.cgi?id=95263

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-09-30 Thread Ken Baker

Are there any updates on fixing this in xenial/16.04?

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-29 Thread Jared Biel

We have some servers that host git mirrors accessed via SSH that are
affected by this. Restarting systemd-logind via cron every 5 minutes
works for us (no full system restart necessary.)

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-26 Thread Ivan Kozik

I don't think there's any change with the dbus from
https://launchpad.net/~sil2100/+archive/ubuntu/ppa.  I tried it twice
(across reboots) and systemd-logind still breaks after a few minutes of
flooding the system with SSH logins.

`loginctl list-sessions` also still seems to grow without cleaning up
~10% of old sessions, but that's probably another bug entirely.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-22 Thread Łukasz Zemczak

In https://launchpad.net/~sil2100/+archive/ubuntu/ppa I did a test-build
of dbus with one of the other WIP proposed patches from
https://bugs.freedesktop.org/show_bug.cgi?id=95263 if anyone would like
to test those and see if they help. Might be good if we gave some
additional feedback to the original bug on the patchsets.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-22 Thread Laurent Bigonville

I would really advise AGAINST setting "UsePAM" to "no"

This will cause other issues like not properly killing the user
applications if the machine is rebooted/shutdown (like
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751636)

** Bug watch added: Debian Bug tracker #751636
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751636

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-22 Thread Laurent Bigonville

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/1961
   Importance: Unknown
   Status: Unknown

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-19 Thread Ivan Kozik

Some hints for using Ubuntu 16.04 machines that can't be rebooted to
work around this bug:

1) You can keep your SSH logins a secret from systemd-logind by adding
`UsePAM no` to /etc/ssh/sshd_config; this will avoid the ~25 second
delay.

2) `UsePAM no` requires unlocked accounts (passwd -u) with a password
set, even if you are only using publickey authentication.

3) You can use `AuthenticationMethods publickey` to prevent login with
the passwords set for those accounts.

4) `su` also uses PAM and therefore informs systemd-logind and hangs for
~25 seconds, but in some cases `ssh user@localhost` can work as a
replacement for `su`.  There doesn't seem to be a way to configure `su`
to not use PAM.

5) If you were relying on PAM to set a ulimit -n (nofile) using
/etc/security/limits.conf, you can add something like
`LimitNOFILE=131072` to the [Service] section in
/etc/systemd/system/sshd.service, then `systemctl daemon-reload &&
systemctl restart sshd`

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-16 Thread Alberto Salvia Novella

** Changed in: dbus (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: dbus (Ubuntu)
   Importance: Undecided => Medium

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-16 Thread Simon McVittie

> I am still not 100% sure if it is considered ready for prime time

As far as I can tell, Lennart's proposed patch on fd.o #95263 would
reintroduce CVE-2014-3637 (fd.o #80559), a denial of service security
vulnerability.

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-3637

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-16 Thread Ubuntu Foundations Team Bug Bot

** Tags added: patch

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-16 Thread Łukasz Zemczak

Ok, with everyone confirming that the systemd patch is not required, I
am closing the systemd part of the bug as 'Invalid' - let's only
concentrate on the dbus part here. That being said, I would not like to
release a new patch for dbus downstream if the patch hasn't been fully
reviewed and approved upstream.

In this case I would propose to wait a bit and see if a finalized patch
will be available.

** Tags removed: patch

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

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

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

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-13 Thread Martin Pitt

** Also affects: dbus via
   https://bugs.freedesktop.org/show_bug.cgi?id=95263
   Importance: Unknown
   Status: Unknown

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Stan Hu

FYI, the dbus patches were written by Lennart Poettering and submitted
here for review: https://bugs.freedesktop.org/show_bug.cgi?id=95263#c13

** Bug watch added: freedesktop.org Bugzilla #95263
   https://bugs.freedesktop.org/show_bug.cgi?id=95263

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Pablo Carranza

Thanks for sponsoring Mike!

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Pablo Carranza

And Łukasz :)

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Stan Hu

That's correct: only the dbus patch is absolutely necessary, but since
the patch wasn't merged yet to dbus I am still not 100% sure if it is
considered ready for prime time. It seems to work for us.

As Łukasz observed, the systemd patch is a lot more extensive. Even
though it was merged to master, we were only going to attempt to
backport the fix if it were absolutely necessary. It doesn't look like
it was in this case, so we did not attempt to do it.

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Ubuntu Foundations Team Bug Bot

** Tags added: patch

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Mike Pontillo

Actually, please disregard the portion of my previous comment where I
suspected we should consider patching systemd as well. I no longer think
that is necessary. (My test case was flawed.) After correcting the issue
(ensuring I was running with the properly-updated dbus fix), I was able
to run eight parallel continuous-SSH scripts against the LXC with the
fixed dbus (without the systemd patch).

ubuntu@test:~$ uptime
 20:13:55 up 4 min,  1 user,  load average: 5.87, 3.70, 2.01

Over 10,000 sessions so far, and no issues. Ship it!

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Mike Pontillo

I would like to thank the GitLab team for their excellent work triaging
this issue (and getting a patch ready). Very nice work. I tested the
version of dbus in Stan Hu's PPA here:

https://launchpad.net/~stanhu/+archive/ubuntu/dbus

After updating dbus to the version in this PPA, I ran my "ssh to a
container" test (which I used as a test case reproduce the bug to file
this), and also on another test system that was experiencing this issue
with a real-world use case.

This time, I was able to SSH into the system several thousand times, and
everything worked fine.

Next I turned it up to eleven by running eight continuous-SSH scripts in
a loop. In a minute or two, it fell over and went back to the 25-second
delay behavior. So while the behavior is *much* improved with the dbus
patch, there are still lingering issues, and I think we should consider
patching systemd as well (in addition to triaging further to determine
if there is larger design flaw that can be fixed separately).

I think it's worth patching dbus alone as a first step. I will test
Łukasz's systemd PPA to see if that further improves things.

Thanks again to everyone in the community who helped pull together a
fix!

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Łukasz Zemczak

** Patch added: "Debdiff of the back-ported systemd patch"
   
https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1591411/+attachment/4719736/+files/systemd_229-4ubuntu8.debdiff

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Łukasz Zemczak

I backported the 230 fix for systemd to the xenial version of the
package and started a test-build in my PPA. The patch didn't apply
cleanly so I had to do some manual interventions - also, the changeset
is pretty big itself. Since I am not a systemd maintainer I would prefer
Martin to take a look at the patch before proceeding, so for now I am
attaching the debdiff here for further review (along with links to the
PPA, in case the package builds fine as I basically just did the dput).

But I also heard that possibly only the dbus fix might be sufficient. In
case anyone confirms that I will prepare a new dbus distro-release for
yakkety and xenial SRU.

PPA used for testing: https://launchpad.net/~sil2100/+archive/ubuntu/ppa

Thank you for your patience.

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Łukasz Zemczak

** Also affects: dbus (Ubuntu)
   Importance: Undecided
   Status: New

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Łukasz Zemczak

** Changed in: systemd (Ubuntu)
 Assignee: Łukasz Zemczak (sil2100) => (unassigned)

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

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Łukasz Zemczak

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

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

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

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-12 Thread Łukasz Zemczak

Hello Pablo and Stan!

I could try sponsoring the patches that you need for fixing these
issues. Just so I know the solution story: to get this issue fixed both
systemd and dbus need their patches, yes?

** Changed in: systemd (Ubuntu)
 Assignee: (unassigned) => Łukasz Zemczak (sil2100)

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-09 Thread Pablo Carranza

Hi, for back reference you can see our progress in the GitLab.com issue:
https://gitlab.com/gitlab-com/infrastructure/issues/290

You can see a graph of behavior before and after the dbus update and the
host reboot here: https://gitlab.com/gitlab-
com/infrastructure/issues/290#note_13607928

I think that the is a lot of value on getting this into ubuntu LTS
because it will solve the lockups for ssh session creations under heavy
load.

You can check realtime behavior here:
http://monitor.gitlab.net/dashboard/db/gitlab-status

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-04 Thread Stan Hu

This is biting us and our customers quite a bit.

More relevant links: https://github.com/systemd/systemd/issues/1961

dbus patch: https://bugs.freedesktop.org/attachment.cgi?id=123493


** Bug watch added: github.com/systemd/systemd/issues #1961
   https://github.com/systemd/systemd/issues/1961

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-08-03 Thread Stan Hu

There are two patches that relate to this problem.

systemd: https://github.com/systemd/systemd/pull/3191

dbus: https://bugs.freedesktop.org/show_bug.cgi?id=95264

The systemd patch was merged in
https://github.com/systemd/systemd/commit/5ab42bc85a11a5250dcdf8e86291d3da90aa84bd
and released in systemd v230 and v231. Ubuntu appears to be on
229-4ubuntu7.

The dbus patch was merged in master but may not be released yet.

** Bug watch added: freedesktop.org Bugzilla #95264
   https://bugs.freedesktop.org/show_bug.cgi?id=95264

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-07-01 Thread Alberto Salvia Novella

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

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-06-15 Thread Christian Reis

** Tags added: cdo-qa-blocker

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-06-13 Thread Launchpad Bug Tracker

Status changed to 'Confirmed' because the bug affects multiple users.

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

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Title:
  systemd-logind must be restarted every ~1000 SSH logins to prevent a
  ~25 second delay

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[Bug 1591411] Re: systemd-logind must be restarted every ~1000 SSH logins to prevent a ~25 second delay

2016-06-10 Thread Mike Pontillo

Here's my (sad) workaround:

$ sudo crontab -l
1,11,21,31,41,51 * * * * service systemd-logind restart


** Description changed:

  I noticed on a system that accepts large numbers of SSH connections that
  after awhile, SSH sessions were taking ~25 seconds to complete.
  
  Looking in /var/log/auth.log, systemd-logind starts failing with the
  following:
  
+ Jun 10 23:55:28 test sshd[3666]: pam_unix(sshd:session): session opened for 
user ubuntu by (uid=0)
+ Jun 10 23:55:28 test systemd-logind[105]: New session c1052 of user ubuntu.
  Jun 10 23:55:28 test systemd-logind[105]: Failed to abandon session scope: 
Transport endpoint is not connected
  Jun 10 23:55:28 test sshd[3666]: pam_systemd(sshd:session): Failed to create 
session: Message recipient disconnected from message bus without replying
  
  I reproduced this in an LXD container by doing something like:
  
  lxc launch ubuntu:x test
  lxc exec test -- login -f ubuntu
  ssh-import-id 
  
  Then ran a script as follows (passing in ubuntu@:
  
  while [ 1 ]; do
- (time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
+ (time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
  done
  
  In my case, after 1052 logins, the 1053rd and thereafter were taking 25+
  seconds to complete. Here are some snippets from the log file:
  
  $ cat log.confirmed_with_password | grep 0m0 | wc -l
  1052
  
  $ cat log.confirmed_with_password | grep 0m25 | wc -l
  4
  
  $ tail -5 log.confirmed_with_password
  real  0m0.222s
  real  0m25.232s
  real  0m25.235s
  real  0m25.236s
  real  0m25.239s
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: systemd 229-4ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Sat Jun 11 00:09:34 2016
  MachineType: Notebook W230SS
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
+  TERM=xterm-256color
+  PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
  SourcePackage: systemd
  SystemdDelta:
-  [EXTENDED]   /lib/systemd/system/rc-local.service → 
/lib/systemd/system/rc-local.service.d/debian.conf
-  [EXTENDED]   /lib/systemd/system/systemd-timesyncd.service → 
/lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
-  
-  2 overridden configuration files found.
+  [EXTENDED]   /lib/systemd/system/rc-local.service → 
/lib/systemd/system/rc-local.service.d/debian.conf
+  [EXTENDED]   /lib/systemd/system/systemd-timesyncd.service → 
/lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
+ 
+  2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W230SS
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W230SS
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook

** Description changed:

  I noticed on a system that accepts large numbers of SSH connections that
  after awhile, SSH sessions were taking ~25 seconds to complete.
  
  Looking in /var/log/auth.log, systemd-logind starts failing with the
  following:
  
  Jun 10 23:55:28 test sshd[3666]: pam_unix(sshd:session): session opened for 
user ubuntu by (uid=0)
  Jun 10 23:55:28 test systemd-logind[105]: New session c1052 of user ubuntu.
  Jun 10 23:55:28 test systemd-logind[105]: Failed to abandon session scope: 
Transport endpoint is not connected
  Jun 10 23:55:28 test sshd[3666]: pam_systemd(sshd:session): Failed to create 
session: Message recipient disconnected from message bus without replying
  
  I reproduced this in an LXD container by doing something like:
  
  lxc launch ubuntu:x test
  lxc exec test -- login -f ubuntu
  ssh-import-id 
  
  Then ran a script as follows (passing in ubuntu@:
  
  while [ 1 ]; do
  (time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
  done
  
  In my case, after 1052 logins, the 1053rd and thereafter were taking 25+
  seconds to complete. Here are some snippets from the log file:
  
- $ cat log.confirmed_with_password | grep 0m0 | wc -l
+ $ cat log | grep 0m0 | wc -l
  1052
  
- $ cat log.confirmed_with_password | grep 0m25 | wc -l
+ $ cat log | grep 0m25 | wc -l
  4
  
- $ tail -5 log.confirmed_with_password
+ $ tail -5 log
  real  0m0.222s
  real  0m25.232s
  real  0m25.235s
  real  0m25.236s
  real  0m25.239s
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: systemd 229-4ubuntu5
  ProcVersionSignature: Ubuntu

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