Hi Timo,

A similar crash is observed in mesa-egl and it is resolved in Mesa
master branch. Please refer the bug:
https://bugs.launchpad.net/mesa/+bug/1946621

Can you help backporting the fix to "Focal" series.

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https://bugs.launchpad.net/bugs/1776499

Title:
  Crash in libegl-mesa0 due to out of bound array access

Status in mesa package in Ubuntu:
  Fix Released
Status in mesa source package in Bionic:
  Fix Released

Bug description:
  Crash in libegl-mesa0 due to out of bound array access. Crash is fixed
  on Mesa master branch with change:
  
https://cgit.freedesktop.org/mesa/mesa/commit/?id=41642bdbca007035772fbfdc311f14daa5510d5d
  .This bug is to request to include this change in Mesa upgrades in
  bionic.

  Please let me know if this change needs to be back ported to other
  branch so that libegl-mesa0 upgrade in Bionic could pick this change.

  lsb_release -a
  Distributor ID: Ubuntu
  Description:    Ubuntu 18.04 LTS
  Release:        18.04
  Codename:       bionic

  apt-cache policy libegl-mesa0
  libegl-mesa0:
    Installed: 18.0.0~rc5-1ubuntu1
    Candidate: 18.0.0~rc5-1ubuntu1
    Version table:
   *** 18.0.0~rc5-1ubuntu1 500
          500 http://ports.ubuntu.com/ubuntu-ports bionic/main arm64 Packages
          100 /var/lib/dpkg/status

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