chromium with flash 28.0.0.126 + NVIDIA driver 384.90 crash and disable kwin_x11 compositing

[spear]

[ 3148.947708] traps: chromium-browse[11854] trap int3 ip:55a0ce34c40c sp:7ffc09cb41a0 error:0
[ 3148.947715] in chromium-browser[55a0cbefa000+8009000]
[ 3149.160567] nvidia-modeset: Freed GPU:0 (GPU-5999a249-a531-ac0e-b829-7818a72e5543) @ PCI:0000:0c:00.0
[ 3149.907851] nvidia-modeset: Allocated GPU:0 (GPU-5999a249-a531-ac0e-b829-7818a72e5543) @ PCI:0000:0c:00.0
[ 3183.135074] NVRM: GPU at PCI:0000:0c:00: GPU-5999a249-a531-ac0e-b829-7818a72e5543
[ 3183.135076] NVRM: GPU Board Serial Number:
[ 3183.135079] NVRM: Xid (PCI:0000:0c:00): 31, Ch 00000020, engmask 00000101, intr 10000000

Zotac GeForce GTX 1070 AMP! Extreme Edition
Xid: 31 => memory page fault ... does not occur in Firefox - only in chromium since upgrade to flash 28.0.0.126
breaks compositing - need to log out and may break other GL dependant apps but for me it doesnt - just kwin_x11 cant composite anymore neither via GUI nor DBUS commands - even it says openGLisBroken is false and it can composite it doesnt toggle/activate compositing.
Only way to get compositing back in this session is running "kwin_x11 --replace &> /dev/null &" and thats not very intuitive for every user.

lsb_release -rd
Description: Ubuntu 17.04 # NOTE Kubuntu
Release: 17.04

KDE Plasma Version: 5.10.5
KDE Frameworks Version: 5.38.0
Qt Version: 5.7.1
Kernel Version: 4.10.0-42-generic
OS Type: 64-bit

Hardware
Processors: 16 x AMD Ryzen 7 1700x Eight-Core Processor
Memory: 31,4 GiB of RAM

apt-cache policy chromium-browser
chromium-browser:
  Installed: 63.0.3239.84-0ubuntu0.17.04.1
  Candidate: 63.0.3239.84-0ubuntu0.17.04.1
  Version table:
 *** 63.0.3239.84-0ubuntu0.17.04.1 500
        500 http://at.archive.ubuntu.com/ubuntu zesty-updates/universe amd64 Packages
        500 http://security.ubuntu.com/ubuntu zesty-security/universe amd64 Packages
        100 /var/lib/dpkg/status
     57.0.2987.98-0ubuntu1.1348 500
        500 http://at.archive.ubuntu.com/ubuntu zesty/universe amd64 Packages

apt-cache policy flashplugin-installer
flashplugin-installer:
  Installed: 28.0.0.126ubuntu0.17.04.1
  Candidate: 28.0.0.126ubuntu0.17.04.1
  Version table:
 *** 28.0.0.126ubuntu0.17.04.1 500
        500 http://at.archive.ubuntu.com/ubuntu zesty-updates/multiverse amd64 Packages
        500 http://security.ubuntu.com/ubuntu zesty-security/multiverse amd64 Packages
        100 /var/lib/dpkg/status
     25.0.0.148ubuntu1 500
        500 http://at.archive.ubuntu.com/ubuntu zesty/multiverse amd64 Packages

apt-cache policy pepperflashplugin-nonfree
pepperflashplugin-nonfree:
  Installed: 1.8.3+nmu1ubuntu1
  Candidate: 1.8.3+nmu1ubuntu1
  Version table:
 *** 1.8.3+nmu1ubuntu1 500
        500 http://at.archive.ubuntu.com/ubuntu zesty/multiverse amd64 Packages
        100 /var/lib/dpkg/status

apt-cache policy kwin
kwin:
  Installed: 4:5.10.5-0ubuntu1~ubuntu17.04~ppa1
  Candidate: 4:5.10.5-0ubuntu1~ubuntu17.04~ppa1
  Version table:
 *** 4:5.10.5-0ubuntu1~ubuntu17.04~ppa1 500
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu zesty/main amd64 Packages
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu zesty/main i386 Packages
        100 /var/lib/dpkg/status
     4:5.9.5-0ubuntu0.1 500
        500 http://at.archive.ubuntu.com/ubuntu zesty-updates/universe amd64 Packages
        500 http://at.archive.ubuntu.com/ubuntu zesty-updates/universe i386 Packages
     4:5.9.5-0ubuntu0.1~ubuntu17.04~ppa1 500
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu zesty/main amd64 Packages
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu zesty/main i386 Packages
     4:5.9.4-0ubuntu1 500
        500 http://at.archive.ubuntu.com/ubuntu zesty/universe amd64 Packages
        500 http://at.archive.ubuntu.com/ubuntu zesty/universe i386 Packages

apt-cache policy nvidia-384
nvidia-384:
  Installed: 384.90-0ubuntu0.17.04.2
  Candidate: 384.90-0ubuntu0.17.04.2
  Version table:
 *** 384.90-0ubuntu0.17.04.2 500
        500 http://at.archive.ubuntu.com/ubuntu zesty-updates/restricted amd64 Packages
        100 /var/lib/dpkg/status
     384.90-0ubuntu0.17.04.1 500
        500 http://security.ubuntu.com/ubuntu zesty-security/restricted amd64 Packages

So chromium didn't update its flash player from 27.0.0.130 so but Firefox did .. got frustrated and reinstalled chromium and pepperflash-nonfree which actually upgraded the version but now when launching Chromium - the GPU has a memory page fault ...
So KWin Compositing is unusable after launching chromium now - I need to logout or shoot down X11 to get compositing back (I am on a Ryzen System and had this problem before with a different driver) - I wished everything would finally work and compositing stayed on. Only way to get compositing back in this session is running "kwin_x11 --replace &> /dev/null &" and thats not very intuitive for every user.

[spear (spearhead2k3)]

added KDE relevant information and Platform info

[spear (spearhead2k3)]

idk -- the Xid error occus thru chromium so I will change it back to chromium ...