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   https://bugs.launchpad.net/bugs/1228991/+attachment/3835925/+files/Stacktrace.txt

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https://bugs.launchpad.net/bugs/1228991

Title:
  compiz crashed with SIGSEGV in _swrast_map_texture()

Status in “unity” package in Ubuntu:
  New

Bug description:
  Saucy updated just updated to 3.11.0-8 from -7.  Ran for a while then
  external monitor froze.  Normally have built-in netbook screen off.
  Systems settings displays said external monitor "unknown display" and
  wouldn't run it.  Normally reports it as Coby electronics co. ltd 40"
  (?) max resolution 19201080x1080 I run it at 1360x768, 15.5" diagonal.

  Rebooted later without external monitor, plugged it back in and
  running normally now.

  ProblemType: Crash
  DistroRelease: Ubuntu 13.10
  Package: unity 7.1.0+13.10.20130920-0ubuntu1
  ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
  Uname: Linux 3.11.0-8-generic x86_64
  ApportVersion: 2.12.4-0ubuntu1
  Architecture: amd64
  CrashCounter: 1
  Date: Sun Sep 22 12:26:38 2013
  ExecutablePath: /usr/bin/compiz
  InstallationDate: Installed on 2013-09-09 (14 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130907)
  MarkForUpload: True
  ProcCmdline: compiz
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f8c9b978d11 <_swrast_map_texture+241>:	cmpq   $0x0,(%rax,%rbp,8)
   PC (0x7f8c9b978d11) ok
   source "$0x0" ok
   destination "(%rax,%rbp,8)" (0x00000000) not located in a known VMA region (needed writable region)!
  SegvReason: writing NULL VMA
  Signal: 11
  SourcePackage: unity
  StacktraceTop:
   _swrast_map_texture () from /usr/lib/x86_64-linux-gnu/libdricore9.2.0.so.1
   _swrast_map_textures () from /usr/lib/x86_64-linux-gnu/libdricore9.2.0.so.1
   _swrast_span_render_start () from /usr/lib/x86_64-linux-gnu/libdricore9.2.0.so.1
   _swrast_render_start () from /usr/lib/x86_64-linux-gnu/libdricore9.2.0.so.1
   ?? () from /usr/lib/x86_64-linux-gnu/libdricore9.2.0.so.1
  Title: compiz crashed with SIGSEGV in _swrast_map_texture()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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