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[Launchpad Bug Tracker <711422@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xorg-server - 2:1.9.99.902-2ubuntu1

---------------
xorg-server (2:1.9.99.902-2ubuntu1) natty; urgency=low

  [ Christopher James Halse Rogers ]
  * Merge from Debian experimental.  Remaining Ubuntu changes:
    - rules:
      + Disable SELinux, libaudit-dev is not in main yet. (LP #406226)
      + Enable xcsecurity. (LP #247537)
      + Add --with-extra-module-dir to support GL alternatives.
      + Mention Ubuntu support in builderstring rather than package uploader's
        email address.
    - control:
      + Xvfb depends on xauth, x11-xkb-utils. (LP #500102)
      + Add breaks for incompatible drivers. (LP #614993)
      + Drop libaudit-dev from build-deps.
      + Build-depend on newer mesa to pick up DRI search paths variable.
    - local/xvfb-run*: Add correct docs about error codes. (LP #328205)
    - debian/patches:
      + 100_rethrow_signals.patch:
        When aborting, re-raise signals for apport
      + 105_nvidia_fglrx_autodetect.patch:
        Load proprietary drivers automatically when installed.
      + 109_fix-swcursor-crash.patch:
        Avoid dereferencing null pointer while reloading cursors during
        resume. (LP: #371405)
      + 111_armel-drv-fallbacks.patch:
        Add support for armel driver fallbacks.
      + 121_only_switch_vt_when_active.diff:
        Add a check to prevent the X server from changing the VT when killing
        GDM from the console.
      + 122_xext_fix_card32_overflow_in_xauth.patch:
        Fix server crash when “xauth generate” is called with large timeout.
      + 157_check_null_modes.patch, 162_null_crtc_in_rotation.patch,
        166_nullptr_xinerama_keyrepeat.patch, 167_nullptr_xisbread.patch
        169_mipointer_nullptr_checks.patch,
        172_cwgetbackingpicture_nullptr_check.patch:
        Fix various segfaults in xserver by checking pointers for NULL
        values before dereferencing them.
      + 165_man_xorg_conf_no_device_ident.patch
        Correct man page
      + 168_glibc_trace_to_stderr.patch:
        Report abort traces to stderr instead of terminal
      + 184_virtual_devices_autodetect.patch:
        Use vesa for qemu device, which is not supported by cirrus
      + 188_default_primary_to_first_busid.patch:
        Pick the first device and carry on (LP: #459512)
      + 190_cache-xkbcomp_output_for_fast_start_up.patch:
      + 191-Xorg-add-an-extra-module-path.patch:
        Add support for the alternatives module path.
      + 198_nohwaccess.patch:
        Adds a -nohwaccess argument to make X not access the hardware
        ports directly.
      + 200_randr-null.patch:
        Clarify a pointer initialization.
      + 206_intel_8xx_default_to_fbdev.patch:
        Makes 8xx class intel GPUs default to fbdev for stability. (LP: #633593)
      + 208_switch_on_release.diff:
        Switch keyboard layouts on key-release rather than key-press
  	(LP #36812)
      + 209_add_legacy_bgnone_option.patch:
        Add -nr as a synonym for -background none until all ?DM are updated for
  	the new option.
      + 210_pixman_null_ptr_check.patch:
        Catch NULL pointer access after pixman_image_create_bits() failure
  	(LP #705078)
      + Add 213_xichangehierarchy-check-oom.patch:
        Add NULL pointer check for out-of-memory conditions. (LP #720445)
      + debian/patches/214_glx_dri_searchdirs.patch:
        Search in same paths as mesa for DRI drivers for AIGLX so we can handle
        UMS fallback for radeon gracefully.
  * 211_glx_fix_bindtextimageext_length_check.patch:
  * 212_fix_request_length_check_for_createglxpbuffersgix.patch:
    - Drop; these cherry-picks are included in 1.10RC2
  * debian/patches/214_glx_dri_searchdirs.patch:
    - Fix nouveau check to downgrade missing DRI error messages to info.
      We don't support nouveau's 3D, so let's not complain too strenuously
      when it's not installed.
  * debian/patches/215_glx_drawable_refcounting.diff:
    - Refcount GLXDrawables to avoid use-after-free crashes.  Patch from
      xorg-devel mailing list.  Prevents segfault on logout and server
      regenerate, and possibly other times. (LP: #711422)
  * 214_glx_dri_searchdirs.patch:
    - Fix dlclose/free snafu. (LP: #722563)
  * debian/inputabiver:
  * debian/videoabiver:
  * debian/xserver-xorg-dev.install
    - Temporarily re-add these to xserver-xorg-dev so we don't need to merge
      all the driver changes from Debian en masse.  These should be dropped
      once all drivers have been merged from Debian, and certainly in Natty+1.
  * debian/serverminver:
    - Include 2ubuntu1 string; Xi 2.1 bumps the minor input ABI, so drivers
      built against it need the Xi 2.1 patched server.

  [ Timo Aaltonen ]
  * debian/patches/216_dix-valuator-count-of-0-is-valid.diff:
    - For all but motion and proximity events, having no valuators is ok.
      Regression from 1.9, keyboard events are not converted to protocol
      events. (LP: #714696)

  [ Chase Douglas ]
  * Add in preliminary xi2.1 support
    - Added 500_xi2.1.patch
    - Moved 202_xf86CoordinationsToWindows.patch to
      501_xf86CoordinatesToWindow.patch
    - Moved 203_gestures-extension.patch to 502_gestures-extension.patch
    - Bump dependency on x11proto-input for xi 2.1
 -- Christopher James Halse Rogers <raof@xxxxxxxxxx>   Wed, 23 Feb 2011 09:40:07 +1100

** Changed in: xorg-server (Ubuntu)
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/711422

Title:
  Xorg assert failure: *** glibc detected *** X: double free or
  corruption (!prev): 0x089f5b20 - Unhandled dwarf expression opcode
  0x9f