Bug#854980: kwin-x11: In multisession (all graphical) w/ desktop effects, kwin tends to crash sessions randomly on nvidia hardware

[Nuno Oliveira <nuno@eq.uc.pt>]

Hi,

I also get random crashes of kwin-x11 with the nvidia binary driver. 
They appear easily (but not always) when using qupzilla for web 
browsing, mostly when new pages are opened in new windows.

Installed versions are:
host:~# apt-cache policy kwin-x11 nvidia-driver-bin
kwin-x11:
 Instalado: 4:5.12.1-1
 Candidato: 4:5.12.1-1
 Tabela de Versão:
*** 4:5.12.1-1 700
       700 https://ftp.eq.uc.pt/software/unix/Linux/debian testing/main amd64 Packages
       650 https://ftp.eq.uc.pt/software/unix/Linux/debian unstable/main amd64 Packages
       100 /var/lib/dpkg/status
    4:5.8.6-1 600
       600 https://ftp.eq.uc.pt/software/unix/Linux/debian stable/main amd64 Packages
nvidia-driver-bin:
 Instalado: 384.111-4
 Candidato: 384.111-4
 Tabela de Versão:
    390.25-1 300
       300 https://ftp.eq.uc.pt/software/unix/Linux/debian experimental/non-free amd64 Packages
*** 384.111-4 700
       700 https://ftp.eq.uc.pt/software/unix/Linux/debian testing/non-free amd64 Packages
       650 https://ftp.eq.uc.pt/software/unix/Linux/debian unstable/non-free amd64 Packages
       100 /var/lib/dpkg/status
    375.82-1~deb9u1 600
       600 https://ftp.eq.uc.pt/software/unix/Linux/debian stable/non-free amd64 Packages

I believe this behaviour also occurred with the previous kwin-x11 
package version. On machines with the intel video driver, I have not 
observed any crashes.

Regards,

Nuno.