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[Brett Johnson <ubuntu@xxxxxxxxxxxxxxx>]

This bug has been reported over and over again since it was introduced
in 12.04 (just do a LP search for "Maximum number of clients reached").
Now, for some reason in 15.10 it's much easier to reproduce.  I hit the
problem every day now, whereas I used to be able to go a couple weeks
without hitting it.  There are many clues in the older reports:

https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/263211
seems to have gotten the most attention, and was closed with changes to
gnome-screensaver, but I don't think that actually fixed the problem
(just made gnome-screensaver quit making the problem show up).  It seems
to be some kind of X resource leak.

I don't know if this is relevant or helpful, but taking some of the
comments from that bug report, here are some of the things folks did in
that bug to troubleshoot:

xwininfo -root -children | wc -l

Over time, the resulting number keeps going up.  It's currently at 430,
and if I open a window (gcalc, for example), I'll get the "Maximum
number of clients reached" error when trying to run xwininfo.  If I look
at the out put of xwininfo -root -children right before that, I see that
about 80% of the windows have no name.

Also, if I run xrestop, I get a whole bunch of "<unknown>" resources
with no associated PID (218 of them at the moment). The other 38 are
actual windows I have open.

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

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https://bugs.launchpad.net/bugs/1518411

Title:
  "Maximum number of clients reached", new in Ubuntu 15.10

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  In my newly upgraded (from 15.04) Ubuntu 15.10 system, after I've been
  logged in for a while I can no longer open new windows and instead get
  a "Maximum number of clients reached" error.

  This did not happen in 15.04.

  I ran "lsof" on the X server and did not see an excessive number of
  open file descriptors. I ran it again on a newly restarted X server
  and the number of open file descriptors looked about the same.

  I also ran "xlsclients" when the X server was reporting "Maximum
  number of clients reached" and the list of clients looked correct and
  reasonable (and there were less than 30 of them).

  I am happy to collect any additional logs or debugging information to
  help track this down. I don't know where to look further.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Fri Nov 20 13:00:09 2015
  DistUpgraded: 2015-11-17 11:59:09,835 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.4, 3.19.0-33-generic, x86_64: installed
   virtualbox, 5.0.4, 4.2.0-18-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Crystal Well Integrated Graphics Controller [8086:0d26] (rev 08) (prog-if 00 [VGA controller])
     Subsystem: CLEVO/KAPOK Computer Device [1558:7410]
  MachineType: System76, Inc. Galago UltraPro
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=821f94aa-97e2-4384-8494-9f510a75877b ro i915.disable_power_well=0 quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to wily on 2015-11-17 (3 days ago)
  dmi.bios.date: 12/12/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W740SU
  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:bd12/12/2013:svnSystem76,Inc.:pnGalagoUltraPro:pvrgalu1:rvnNotebook:rnW740SU:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: Galago UltraPro
  dmi.product.version: galu1
  dmi.sys.vendor: System76, Inc.
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Fri Nov 20 12:51:23 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9
  xserver.video_driver: intel

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