Xorg crashed with SIGSEGV in dl_iterate_phdr()

[Britt Yazel]

Xorg froze and then crashed what I was just using the internet for moderate web browsing. After about 10 seconds of a frozen screen, the screen went black and returned me to the login screen.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-core 2:1.11.4-0ubuntu10
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: wl fglrx
.tmp.unity.support.test.0:

ApportVersion: 2.0.1-0ubuntu3
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
CrashCounter: 1
Date: Sat Apr 14 16:12:31 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 5.100.82.38+bdcom, 3.2.0-23-generic, x86_64: installed
 fglrx, 8.960, 3.2.0-23-generic, x86_64: installed
 virtualbox, 4.1.12, 3.2.0-23-generic, x86_64: installed
ExecutablePath: /usr/bin/Xorg
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI RS880M [Mobility Radeon HD 4200 Series] [1002:9712] (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0360]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
JockeyStatus:
 xorg:fglrx_updates - ATI/AMD proprietary FGLRX graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
 kmod:wl - Broadcom STA wireless driver (Proprietary, Enabled, In use) [auto-install]
 xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Enabled, In use)
MachineType: Acer Aspire 5553
ProcCmdline: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=e49eb218-80c6-43a9-be04-f706272ad1b0 ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7fcc22059374 <TimerSet+84>: mov (%rax),%rax
 PC (0x7fcc22059374) ok
 source "(%rax)" (0x00027029) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: fglrx-installer
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libgcc_s.so.1
 dl_iterate_phdr () from /lib/x86_64-linux-gnu/libc.so.6
 _Unwind_Find_FDE () from /lib/x86_64-linux-gnu/libgcc_s.so.1
 ?? () from /lib/x86_64-linux-gnu/libgcc_s.so.1
 _Unwind_Backtrace () from /lib/x86_64-linux-gnu/libgcc_s.so.1
Title: Xorg crashed with SIGSEGV in dl_iterate_phdr()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 04/25/2011
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: V1.23
dmi.board.name: JV51_DN
dmi.board.vendor: Acer
dmi.board.version: Not Applicable
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.23:bd04/25/2011:svnAcer:pnAspire5553:pvrNotApplicable:rvnAcer:rnJV51_DN:rvrNotApplicable:cvnAcer:ct10:cvrN/A:
dmi.product.name: Aspire 5553
dmi.product.version: Not Applicable
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.7.6-0ubuntu1
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #969087, 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.