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[Launchpad Bug Tracker <1720890@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package mesa - 17.2.4-0ubuntu1~17.10.2

---------------
mesa (17.2.4-0ubuntu1~17.10.2) artful; urgency=medium

  * i965-disable-l3-cache-alloc-for-ext-buffers.diff:
    - Replaced with five backported commits from upstream
      (LP: #1727401, #1735594)

mesa (17.2.4-0ubuntu1~17.10.1) artful; urgency=medium

  * Backport to artful.
  * vulkan-mir.patch: Dropped, breaks radeon vulkan driver. (LP:
    #1720890)

mesa (17.2.4-0ubuntu1) bionic; urgency=medium

  * New upstream bugfix release. (LP: #1727390)
  * i965-disable-l3-cache-alloc-for-ext-buffers.diff: Fix corruption
    running windowed 3D apps on dGPU. (LP: #1727401)

 -- Timo Aaltonen <tjaalton@xxxxxxxxxx>  Tue, 09 Jan 2018 15:28:48 +0200

** Changed in: mesa (Ubuntu Artful)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1720890

Title:
  vulkan-smoketest segfaults steam vulkan games segfault

Status in mesa package in Ubuntu:
  Fix Released
Status in mesa source package in Xenial:
  Fix Released
Status in mesa source package in Artful:
  Fix Released

Bug description:
  $ lsb_release -rd
  Description:	Ubuntu Artful Aardvark (development branch)
  Release:	17.10

  $ apt-cache policy mesa-vulkan-drivers
  mesa-vulkan-drivers:
    Installed: 17.2.1-0ubuntu1
    Candidate: 17.2.1-0ubuntu1
    Version table:
   *** 17.2.1-0ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu artful/universe amd64 Packages
          100 /var/lib/dpkg/status

  
  Easily reproducible : apt-get install mesa-vulkan-drivers apt-get install vulkan-utils

  Open a terminal type vulkan-smoketest instead of a glxgears type window it will segfault.
  message from kernel.log:
  Sep 29 16:23:53 Tardis-1 kernel: [17709.532915] vulkan-smoketes[11798]: segfault at 0 ip 00007fed61a17914 sp 00007ffedcb8f850 error 6 in libvulkan_radeon.so[7fed619ab000+18b000]
  syslog:
  Sep 28 10:38:13 Tardis-1 kernel: [18292.174313] vulkan-smoketes[13385]: segfault at 0 ip 00007f62705a7914 sp 00007ffd0edc6260 error 6 in libvulkan_radeon.so[7f627053b000+18b000]

  What should happen is a glxgears like window will open and render properly instead of segfaulting.
  It appears that the culprit is an old or broken libvulkan_radeon.so provided by mesa-vulkan-drivers.

  As a test I renamed the old lib and dropped in a newer version from
  oibaf's ppa. smoketest now passes steam's The Talos Princible and Mad
  Max now work properly in Vulkan mode as well instead of segfaulting.

  This issue is also present on Zesty and fixed in both Oibaf's and
  Padoka's ppa's since April back when they were rolling 17.2 mesa.

  I have no idea if libvulkan_intel.so also needs updating no hardware
  to check.

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