[Bug 1553328] Re: unity8 crashed with SIGSEGV on nouveau, in eglMakeCurrent() ... nv50_flush() ... pushbuf_kref()

[Daniel van Vugt]

Done. There doesn't appear to be any way that Mir itself can screw up
that call.

It's possible qtmir might be messing up with an incorrect 'this' pointer
to the Mir DisplayBuffer. But I think much more likely that it's a
nouveau driver bug. If it wasn't then we'd be seeing similar crashes
with intel and radeon, but we don't.

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

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Title:
  unity8 crashed with SIGSEGV on nouveau, in eglMakeCurrent() ...
  nv50_flush() ... pushbuf_kref()

Status in Mir:
  Invalid
Status in libdrm package in Ubuntu:
  New
Status in mir package in Ubuntu:
  Invalid
Status in qtmir package in Ubuntu:
  Incomplete

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
  SegvAnalysis:
   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
  StacktraceTop:
   ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
   ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
   ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
   ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
   ?? () from /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
  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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