This bug was fixed in the package mesa - 12.0.3-1ubuntu1

mesa (12.0.3-1ubuntu1) yakkety; urgency=medium

  * Merge from Debian.

  [ Christopher James Halse Rogers ]
  * egl-platform-mir.patch: Updated for upstream changes to dri2_initialize
    in egl_dri2.c. (LP: #1620934, #1620994)

mesa (12.0.3-1) unstable; urgency=medium

  * New upstream release.
  * Enable vc4 on arm64.

 -- Timo Aaltonen <>  Fri, 16 Sep 2016 10:07:05 +0300

** Changed in: mesa (Ubuntu)
       Status: In Progress => Fix Released

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  [regression] Starting in Mesa 12.0.2, EGL clients crash with SIGSEGV
  in dri2_destroy_context() (from eglDestroyContext or eglTerminate)

Status in Canonical System Image:
Status in Mir:
Status in mesa package in Ubuntu:
  Fix Released
Status in unity8 package in Ubuntu:

Bug description:
  Ubuntu 16.10 + proposed x86, nvidia 8600gt nouveau

  unity8-dash crashed with SIGSEGV in eglDestroyContext()

  ProblemType: Crash
  DistroRelease: Ubuntu 16.10
  Package: unity8 8.14+16.10.20160831.3-0ubuntu1
  ProcVersionSignature: Ubuntu 4.6.0-10.12-generic 4.6.5
  Uname: Linux 4.6.0-10-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  CrashCounter: 1
  Date: Wed Sep  7 13:04:53 2016
  ExecutablePath: /usr/bin/unity8-dash
  InstallationDate: Installed on 2016-06-05 (93 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
  ProcCmdline: unity8-dash 
   Segfault happened at: 0x7fcab45aea3e:        mov    0x30(%rbp),%rax
   PC (0x7fcab45aea3e) ok
   source "0x30(%rbp)" (0x00000030) not located in a known VMA region (needed 
readable region)!
   destination "%rax" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: unity8
   ?? () from /usr/lib/x86_64-linux-gnu/mesa-egl/
   eglDestroyContext () from /usr/lib/x86_64-linux-gnu/mesa-egl/
   ?? () from 
   ?? () from 
   QOpenGLContext::destroy() () from /usr/lib/x86_64-linux-gnu/
  Title: unity8-dash crashed with SIGSEGV in eglDestroyContext()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  upstart.unity8-dash.log: [2016-09-07:13:04:52.767] QEGLPlatformContext: 
eglMakeCurrent failed: 3001

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