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[Rolf Leggewie <926918@xxxxxxxxxxxxxxxxxx>]

oneiric has seen the end of its life and is no longer receiving any
updates. Marking the oneiric task for this ticket as "Won't Fix".

** Changed in: mesa (Ubuntu Oneiric)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/926918

Title:
  es2_info crashed with SIGSEGV in nv50_screen_fence_update()

Status in Mesa:
  Fix Released
Status in mesa package in Ubuntu:
  Fix Released
Status in mesa source package in Oneiric:
  Won't Fix
Status in mesa source package in Precise:
  Fix Released

Bug description:
  [Impact]
  Users running the nouveau X driver with the egl_dri2 mesa driver may experience a windowing system crash (kwin_gles, etc.) in the nv50_screen_fence_update() routine.

  [Development Fix]
  The problem was fixed upstream in mesa 8.0 which we are shipping in Precise.  The patch switches from using a context object for flushing purposes, to a screen object; the context object can go NULL sometimes which leads to the crash.

  [Stable Fix]
  Upstream also created a backport of the mesa 8.0 patch to 7.11, although at time of writing this was not yet released in a 7.11.x point release.  The patch applies cleanly to the oneiric mesa and is what we're using for this SRU.

  [Text Case]
  1. install nouveau video driver
  2. call /usr/bin/es2_info from mesa-utils-extra
  Broken Behavior: application crashes
  Fixed Behavior: egl information is printed out

  [Regression Potential]
  The scope of this patch is limited to nouveau (and specifically to newer NVIDIA cards of the 8xxx series and up).  Indeed it probably has no effect on non-egl window systems (like Unity/Compiz), so the scope is probably quite small.

  Since the patch is included upstream as part of the mesa 8.0 tree, and
  is selected for the 7.11 stable series, the patch is likely quite
  safe.  If there were any regressions caused by this, I would expect
  symptoms similar to the original bug (i.e. crashes).

  [Original Report]
  called /usr/bin/es2_info from mesa-utils-extra

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: mesa-utils-extra 8.0.1+git20110129+d8f7d6b-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-15.26-generic 3.0.13
  Uname: Linux 3.0.0-15-generic x86_64
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  Date: Sat Feb  4 23:52:38 2012
  ExecutablePath: /usr/bin/es2_info
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  ProcCmdline: es2_info
  SegvAnalysis:
   Segfault happened at: 0x7fcea9943fa7:	mov    (%rax),%eax
   PC (0x7fcea9943fa7) ok
   source "(%rax)" (0x7fceacc81000) not located in a known VMA region (needed readable region)!
   destination "%eax" ok
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: mesa-demos
  StacktraceTop:
   ?? () from /usr/lib/x86_64-linux-gnu/egl/egl_gallium.so
   nouveau_fence_update () from /usr/lib/x86_64-linux-gnu/egl/egl_gallium.so
   nv50_default_flush_notify () from /usr/lib/x86_64-linux-gnu/egl/egl_gallium.so
   nouveau_pushbuf_flush () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.1
   nouveau_grobj_free () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.1
  Title: es2_info crashed with SIGSEGV in nouveau_fence_update()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare users

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