The nouveau isn't threadsafe and the Qt renderer uses threaded GL by

We don't know if Mir's default renderer would also exhibit the same
issue when running multimonitor. (The Mir renderer uses a thread per
monitor, but this is a simpler usage pattern than Qt and may not
manifest problems.)

** Changed in: mir
       Status: Triaged => Incomplete

** Changed in: mir
   Importance: High => Undecided

** Changed in: mir (Ubuntu)
       Status: Triaged => Incomplete

** Changed in: mir (Ubuntu)
   Importance: High => Undecided

** Changed in: canonical-devices-system-image
     Assignee: Stephen M. Webb (bregma) => (unassigned)

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  Mir/Unity8/USC crashes/freezes on nouveau (nv50) in pushbuf_kref()
  especially with multiple monitors, webbrowser-app or system settings

Status in Canonical System Image:
Status in Mir:
Status in Nouveau Xorg driver:
Status in Unity System Compositor:
Status in libdrm package in Ubuntu:
Status in mesa package in Ubuntu:
Status in mir package in Ubuntu:
Status in qtmir package in Ubuntu:
  In Progress
Status in qtubuntu package in Ubuntu:
  In Progress

Bug description:
  Unit8 froze up while I was trying to open system settings.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: unity8 8.11+16.04.20160216.1-0ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-9.24-generic 4.4.3
  Uname: Linux 4.4.0-9-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Fri Mar  4 19:12:54 2016
  ExecutablePath: /usr/bin/unity8
  InstallationDate: Installed on 2015-05-10 (299 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  ProcCmdline: unity8
   Segfault happened at: 0x7f58d568706c:        mov    0x8(%rsi),%edx
   PC (0x7f58d568706c) ok
   source "0x8(%rsi)" (0x00000008) not located in a known VMA region (needed 
readable region)!
   destination "%edx" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: unity8
   ?? () from /usr/lib/x86_64-linux-gnu/
   ?? () from /usr/lib/x86_64-linux-gnu/
   ?? () from /usr/lib/x86_64-linux-gnu/dri/
   ?? () from /usr/lib/x86_64-linux-gnu/dri/
   ?? () from /usr/lib/x86_64-linux-gnu/mesa-egl/
  Title: unity8 crashed with SIGSEGV
  UpgradeStatus: Upgraded to xenial on 2015-11-07 (118 days ago)
  UserGroups: adm autopilot cdrom dip lpadmin plugdev sambashare sudo

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