Randomly I am left without windows decoration and other window-related function

[Uqbar]

I cannot reproduce it but it seems to me it is triggered when I open a "file selection" widget.
I canno switch between windows with ALT+TAB, I cannot iconize or resize windows (no window widgets and handles).
If I am lucky I can use the "K" button to logout e log back in.
I am available to help troubleshooting provided that precise directions are provided.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: kwin-x11 4:5.5.5-0ubuntu1
Uname: Linux 4.4.10-040410-lowlatency x86_64
NonfreeKernelModules: nls_iso8859_1 8812au cfg80211 pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv rfcomm bnep btusb btrtl btbcm btintel xt_multiport iptable_filter ip_tables x_tables ath3k bluetooth input_leds hp_wmi intel_rapl snd_hda_codec_realtek sparse_keymap x86_pkg_temp_thermal snd_hda_codec_generic intel_powerclamp coretemp kvm_intel snd_hda_intel kvm snd_hda_codec irqbypass snd_hda_core crct10dif_pclmul snd_hwdep crc32_pclmul snd_pcm aesni_intel snd_seq_midi aes_x86_64 snd_seq_midi_event lrw snd_rawmidi gf128mul glue_helper snd_seq ablk_helper cryptd snd_seq_device snd_timer serio_raw snd mei_me mei soundcore lpc_ich shpchp 8250_fintek mac_hid parport_pc ppdev lp parport autofs4 xfs uas usb_storage raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 multipath linear hid_generic usbhid hid raid0 i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt psmouse ahci fb_sys_fops r8169 libahci drm mii wmi fjes video
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: KDE
Date: Mon May 16 15:56:26 2016
InstallationDate: Installed on 2016-04-22 (23 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: kwin
UpgradeStatus: No upgrade log present (probably fresh install)

[Uqbar (uqbar)]

Current workaround is to kill kwin_x11 and to restart it.

[Launchpad Janitor (janitor)]

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

[Uqbar (uqbar)]

1. There's no debugging version of the package kwin-x11
2. The problem seems to be tied to the notifications (but I cannot be sure)
3. The kwin_x11 process doesn't die but
4. killing and restarting it seems to temnporarily solve the problem.

[Stuart Morrison (l-stuart)]

When I get these symptoms I hit alt-F2 to get the command runner and enter..

killall plasmashell ; kstart plasmashell

..to restart plasmashell.

[Uqbar (uqbar)]

Just killing and restarting kwin_x11 is enough for me.
But, I'd like to troubleshoot and head to a fix, more than workarounds, though.
Doesn't anyone here know how to debug this nasty issue?

[Uqbar (uqbar)]

None knows? The problem is quite annoying.
I am now running a crontab every hour with "x11_kwin --replace".

[Thomas Mayer (thomas303)]

I experience this issue for a long time using gnome flashback. At least since 14.04 if not even 12.04 or 10.04. It happens randomly and very very rarely, but a little more frequently when I have an instance of PhpStorm running (large java application).

[Thomas Mayer (thomas303)]

I'm on up-to-date 16.04 and still have this issue from time to time.

[Alberto Salvia Novella (es20490446e)]

Please:

1. Report to (https://bugs.kde.org).
2. Paste the new report link here.
3. Set status back to "confirmed".

Thank you.

[Uqbar (uqbar)]

https://bugs.kde.org/show_bug.cgi?id=368297

[Uqbar (uqbar)]

Almost 8 years ago...