[Bug 1864613] Re: xfwm4 very, very slow - leaking something?

[Robie Basak]

That only half answers my question. Are *all* the requirements from
https://wiki.ubuntu.com/StableReleaseUpdates#New_upstream_microreleases
met, and if so, how?

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https://bugs.launchpad.net/bugs/1864613

Title:
  xfwm4 very, very slow - leaking something?

Status in Xfwm4:
  Unknown
Status in xfwm4 package in Ubuntu:
  Confirmed
Status in xfwm4 source package in Focal:
  In Progress
Status in xfwm4 source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * There is an error leak in the Xfwm4 compositor, causing the system
  to run slowly after some uptime.

  [Test Plan]

   * Enable the Xfwm4 compositor if it is not already. Settings Manager
  > Window Manager Tweaks > Compositor > Toggle on "Enable Display
  Compositing".

   * Use the desktop for some time. Reportedly, zooming in and out
  repeatedly can speed up the process. To zoom, hold Alt, and scroll up
  and down.

   * The system should start performing poorly after some time, with
  xfwm4 consuming much of the CPU resources.

   * Once fixed, the system should be much more performant after
  performing these tasks.

  [Where problems could occur]

   * Regression potential should be relatively low, as the release
  between 4.14.1 and 4.14.5 are bug releases.

   * With window managers, some changes could lead to different behavior
  and other broken displays. Non-AMD graphics users should also test for
  regressions.

  [Other Info]
   
   * Please see the Xfwm4 release notes for changes between 4.14.1 and 4.14.5: https://gitlab.xfce.org/xfce/xfwm4/-/blob/xfce-4.14/NEWS#L7-44

  [Original Report]

  After some uptime, xfwm4 is VERY slow at something, to the point that
  it's consuming 100% of CPU on a Xeon system and making the system
  entirely unusable. I don't know who is leaking what, but somebody is
  clearly leaking something.

  I don't have debug symbols, so this is the best I can get:

  Thread 1 (Thread 0x7f7b9d98af00 (LWP 27599)):
  #0  0x00007f7b9f1e8b7f in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #1  0x00007f7b9f1e8be2 in gdk_x11_display_error_trap_push () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #2  0x0000555c9582c771 in ?? ()
  #3  0x00007f7b9ee75248 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #4  0x00007f7b9ee7471e in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #5  0x00007f7b9ee74ad0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #6  0x00007f7b9ee74dc3 in g_main_loop_run () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #7  0x00007f7b9f4d2c2d in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
  #8  0x0000555c958222ce in ?? ()
  #9  0x00007f7b9e7861e3 in __libc_start_main (main=0x555c95821b50, argc=6, argv=0x7fffbeb91c18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffbeb91c08) at ../csu/libc-start.c:308
  #10 0x0000555c9582249e in ?? ()

  or

  Thread 1 (Thread 0x7f7b9d98af00 (LWP 27599)):
  #0  0x00007f7b9f1e8b83 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #1  0x00007f7b9f1e8be2 in gdk_x11_display_error_trap_push () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #2  0x0000555c9582e33a in ?? ()
  #3  0x0000555c95834f1b in ?? ()
  #4  0x0000555c958337d0 in ?? ()
  #5  0x00007f7b9f1f0f4f in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #6  0x00007f7b9f1f133a in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #7  0x00007f7b9f1b9094 in gdk_display_get_event () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #8  0x00007f7b9f1f0fe6 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  #9  0x00007f7b9ee7484d in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #10 0x00007f7b9ee74ad0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #11 0x00007f7b9ee74dc3 in g_main_loop_run () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
  #12 0x00007f7b9f4d2c2d in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
  #13 0x0000555c958222ce in ?? ()
  #14 0x00007f7b9e7861e3 in __libc_start_main (main=0x555c95821b50, argc=6, argv=0x7fffbeb91c18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffbeb91c08) at ../csu/libc-start.c:308
  #15 0x0000555c9582249e in ?? ()

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: xfwm4 4.14.0-1
  ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13
  Uname: Linux 5.3.0-26-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu8.4
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Feb 24 23:18:34 2020
  InstallationDate: Installed on 2019-01-21 (399 days ago)
  InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2)
  SourcePackage: xfwm4
  UpgradeStatus: Upgraded to eoan on 2019-11-10 (106 days ago)

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