Actually, the snapshotting/screencasting thread could also trigger it.
If that's still a thing...?

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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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