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[Apport retracing service <850398@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 819795 ***
    https://bugs.launchpad.net/bugs/819795

Thank you for taking the time to report this crash and helping to make
Ubuntu better.  This particular crash has already been reported and is a
duplicate of bug #819795, so is being marked as such.  Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

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** This bug has been marked a duplicate of bug 819795
   nautilus crashed with SIGSEGV in g_type_check_instance_is_a()

** Visibility changed to: Public

** Tags removed: need-amd64-retrace

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https://bugs.launchpad.net/bugs/850398

Title:
  nautilus crashed with SIGSEGV in g_type_check_instance_is_a()

Status in “nautilus” package in Ubuntu:
  New

Bug description:
  I ran:
  aticonfig --adapter=0 --initial=dual-head --screen-layout=right

  the right screen looks like a default X screen with no windows
  manager.  (Grey background cursor is an X)  but the left monitor is
  running fine.  When I click anywhere in the right monitor, I get this
  error.  And then left monitor changes from a grey background to my
  normal desktop background but still maintains the default X cursor.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: nautilus 1:3.1.90-0ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  CrashCounter: 1
  Date: Wed Sep 14 16:09:05 2011
  ExecutablePath: /usr/bin/nautilus
  ProcCmdline: nautilus -n
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f4c6c14c400 <g_type_check_instance_is_a+112>:	testb  $0x4,0x16(%rdi)
   PC (0x7f4c6c14c400) ok
   source "$0x4" ok
   destination "0x16(%rdi)" (0x756e656d2d6b747a) not located in a known VMA region (needed writable region)!
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: nautilus
  StacktraceTop:
   g_type_check_instance_is_a () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
   gdk_window_get_screen () from /usr/lib/libgdk-3.so.0
   gdk_device_get_position () from /usr/lib/libgdk-3.so.0
   ?? () from /usr/lib/libgtk-3.so.0
   gtk_menu_popup_for_device () from /usr/lib/libgtk-3.so.0
  Title: nautilus crashed with SIGSEGV in g_type_check_instance_is_a()
  UpgradeStatus: Upgraded to oneiric on 2011-09-06 (8 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

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