maya lazarova, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p xorg-server REPLACE-WITH-BUG-NUMBER

Please note, given that the information from the prior release is
already available, doing this on a release prior to the development one
would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

** Changed in: xorg-server (Ubuntu)
   Importance: High => Low

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

-- 
You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/945918

Title:
  Xorg crashed with SIGSEGV in WriteToClient() with buf="\021"

Status in “xorg-server” package in Ubuntu:
  Incomplete

Bug description:
  => 0xb755d5c2:        mov    %eax,(%edx)
     0xb755d5c4:        movl   $0x1b0,0x20(%esp)
     0xb755d5cc:        jne    0xb755d7bd
     0xb755d5d2:        test   $0x2,%edi
     0xb755d5d8:        jne    0xb755d7d1
     0xb755d5de:        mov    0x20(%esp),%ecx
     0xb755d5e2:        xor    %eax,%eax
     0xb755d5e4:        shr    $0x2,%ecx
     0xb755d5e7:        rep stos %eax,%es:(%edi)
     0xb755d5e9:        testb  $0x2,0x20(%esp)
     0xb755d5ee:        je     0xb755d5f8
     0xb755d5f0:        movw   $0x0,(%edi)
     0xb755d5f5:        add    $0x2,%edi
     0xb755d5f8:        testb  $0x1,0x20(%esp)
     0xb755d5fd:        je     0xb755d602
     0xb755d5ff:        movb   $0x0,(%edi)

  #17 OsSigHandler (signo=11, sip=0xbff072fc, unused=0xbff0737c) at 
../../os/osinit.c:108
  No locals.
  #18 <signal handler called>
  No symbol table info available.
  #19 __memmove_ssse3_rep () at 
../sysdeps/i386/i686/multiarch/memcpy-ssse3-rep.S:1298
  No locals.
  #20 0xb769c14a in FlushClient (who=0xb869f010, oc=0xb869f688, 
__extraBuf=0xbff07d1c, extraCount=32) at 
/usr/include/i386-linux-gnu/bits/string3.h:58
          before = <optimized out>
          remain = <optimized out>
          i = <optimized out>
          len = <optimized out>
          oco = 0xb84db678
          connection = 49
          trans_conn = 0xb86985f8
          iov = {{iov_base = 0xb8589b90, iov_len = 43886456}, {iov_base = 
0xbff07d1c, iov_len = 32}, {iov_base = 0x0, iov_len = 3075820008}}
          padBuffer = "\000\000"
          extraBuf = 0xbff07d1c "\021"
          written = <optimized out>
          padsize = 0
          notWritten = 43886488
          todo = <optimized out>
  #21 0xb769c3a4 in WriteToClient (who=0xb869f010, count=32, __buf=0xbff07d1c) 
at ../../os/io.c:860
          oc = <optimized out>
          oco = <optimized out>
          padBytes = 1
          buf = 0xbff07d1c "\021"
  #22 0xb7552ccd in WriteEventsToClient (events=0xbff07d1c, count=<optimized 
out>, pClient=<optimized out>) at ../../dix/events.c:6131
          eventCopy = {u = {u = {type = 244 '\364', detail = 79 'O', 
sequenceNumber = 46960}, keyButtonPointer = {pad00 = 3077591028, time = 
3087093992, root = 3087093968, event = 3077628408, child = 3220208100, rootX = 
-7688, rootY = -18576, eventX = 0, eventY = 0, state = 31072, sameScreen = 240 
'\360', pad1 = 191 '\277'}, enterLeave = {pad00 = 3077591028, time = 
3087093992, root = 3087093968, event = 3077628408, child = 3220208100, rootX = 
-7688, rootY = -18576, eventX = 0, eventY = 0, state = 31072, mode = 240 
'\360', flags = 191 '\277'}, focus = {pad00 = 3077591028, window = 3087093992, 
mode = 208 '\320', pad1 = 80 'P', pad2 = 1 '\001', pad3 = 184 '\270'}, expose = 
{pad00 = 3077591028, window = 3087093992, x = 20688, y = 47105, width = 57848, 
height = 46960, count = 31204, pad2 = 49136}, graphicsExposure = {pad00 = 
3077591028, drawable = 3087093992, x = 20688, y = 47105, width = 57848, height 
= 46960, minorEvent = 31204, count = 49136, majorEvent = 248 '\370', pad1 = 225 
'\341', pad2 = 112 'p', pad3 = 183 '\267'}, noExposure = {pad00 = 3077591028, 
drawable = 3087093992, minorEvent = 20688, majorEvent = 1 '\001', bpad = 184 
'\270'}, visibility = {pad00 = 3077591028, window = 3087093992, state = 208 
'\320', pad1 = 80 'P', pad2 = 1 '\001', pad3 = 184 '\270'}, createNotify = 
{pad00 = 3077591028, parent = 3087093992, window = 3087093968, x = -7688, y = 
-18576, width = 31204, height = 49136, borderWidth = 57848, override = 112 'p', 
bpad = 183 '\267'}, destroyNotify = {pad00 = 3077591028, event = 3087093992, 
window = 3087093968}, unmapNotify = {pad00 = 3077591028, event = 3087093992, 
window = 3087093968, fromConfigure = 248 '\370', pad1 = 225 '\341', pad2 = 112 
'p', pad3 = 183 '\267'}, mapNotify = {pad00 = 3077591028, event = 3087093992, 
window = 3087093968, override = 248 '\370', pad1 = 225 '\341', pad2 = 112 'p', 
pad3 = 183 '\267'}, mapRequest = {pad00 = 3077591028, parent = 3087093992, 
window = 3087093968}, reparent = {pad00 = 3077591028, event = 3087093992, 
window = 3087093968, parent = 3077628408, x = 31204, y = -16400, override = 248 
'\370', pad1 = 225 '\341', pad2 = 112 'p', pad3 = 183 '\267'}, configureNotify 
= {pad00 = 3077591028, event = 3087093992, window = 3087093968, aboveSibling = 
3077628408, x = 31204, y = -16400, width = 57848, height = 46960, borderWidth = 
0, override = 0 '\000', bpad = 0 '\000'}, configureRequest = {pad00 = 
3077591028, parent = 3087093992, window = 3087093968, sibling = 3077628408, x = 
31204, y = -16400, width = 57848, height = 46960, borderWidth = 0, valueMask = 
0, pad1 = 3220207968}, gravity = {pad00 = 3077591028, event = 3087093992, 
window = 3087093968, x = -7688, y = -18576, pad1 = 3220208100, pad2 = 
3077628408, pad3 = 0, pad4 = 3220207968}, resizeRequest = {pad00 = 3077591028, 
window = 3087093992, width = 20688, height = 47105}, circulate = {pad00 = 
3077591028, event = 3087093992, window = 3087093968, parent = 3077628408, place 
= 228 '\344', pad1 = 121 'y', pad2 = 240 '\360', pad3 = 191 '\277'}, property = 
{pad00 = 3077591028, window = 3087093992, atom = 3087093968, time = 3077628408, 
state = 228 '\344', pad1 = 121 'y', pad2 = 49136}, selectionClear = {pad00 = 
3077591028, time = 3087093992, window = 3087093968, atom = 3077628408}, 
selectionRequest = {pad00 = 3077591028, time = 3087093992, owner = 3087093968, 
requestor = 3077628408, selection = 3220208100, target = 3077628408, property = 
0}, selectionNotify = {pad00 = 3077591028, time = 3087093992, requestor = 
3087093968, selection = 3077628408, target = 3220208100, property = 
3077628408}, colormap = {pad00 = 3077591028, window = 3087093992, colormap = 
3087093968, new = 248 '\370', state = 225 '\341', pad1 = 112 'p', pad2 = 183 
'\267'}, mappingNotify = {pad00 = 3077591028, request = 232 '\350', 
firstKeyCode = 80 'P', count = 1 '\001', pad1 = 184 '\270'}, clientMessage = 
{pad00 = 3077591028, window = 3087093992, u = {l = {type = 3087093968, longs0 = 
-1217338888, longs1 = -1074759196, longs2 = -1217338888, longs3 = 0, longs4 = 
-1074759328}, s = {type = 3087093968, shorts0 = -7688, shorts1 = -18576, 
shorts2 = 31204, shorts3 = -16400, shorts4 = -7688, shorts5 = -18576, shorts6 = 
0, shorts7 = 0, shorts8 = 31072, shorts9 = -16400}, b = {type = 3087093968, 
bytes = "\370\341p\267\344y\360\277\370\341p\267\000\000\000\000`y\360\277"}}}}}
          eventTo = <optimized out>
          i = <optimized out>
          eventFrom = <optimized out>
          eventlength = 32
  #23 WriteEventsToClient (pClient=0xb869f010, count=1, events=0xbff07d1c) at 
../../dix/events.c:6015

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-core 2:1.11.4-0ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-17.27-generic-pae 3.2.6
  Uname: Linux 3.2.0-17-generic-pae i686
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:

  ApportVersion: 1.94-0ubuntu1
  Architecture: i386
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  Date: Sun Mar  4 00:20:32 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  DkmsStatus: bcmwl, 5.100.82.38+bdcom, 3.2.0-17-generic-pae, i686: installed
  ExecutablePath: /usr/bin/Xorg
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3614]
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120303)
  MachineType: LENOVO IdeaCentre A320 10065
  ProcCmdline: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 
-novtswitch -background none
  ProcEnviron:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic-pae 
root=UUID=df2356f1-b126-4ab1-86d0-ae1e48d28490 ro quiet splash vt.handoff=7
  SegvAnalysis:
   Segfault happened at: 0xb755d5c2:    mov    %eax,(%edx)
   PC (0xb755d5c2) ok
   source "%eax" ok
   destination "(%edx)" (0xfea24b81) not located in a known VMA region (needed 
writable region)!
  SegvReason: writing unknown VMA
  Signal: 11
  SourcePackage: xorg-server
  StacktraceTop:
   ErrorF ()
   xorg_backtrace ()
   ?? ()
   <signal handler called>
   ?? () from /lib/i386-linux-gnu/libc.so.6
  Title: Xorg crashed with SIGSEGV in ErrorF()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  dmi.bios.date: 05/16/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: DNkT14AUS
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: HURONRIVER
  dmi.board.vendor: LENOVO
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.type: 13
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnLENOVO:bvrDNkT14AUS:bd05/16/2011:svnLENOVO:pnIdeaCentreA32010065:pvrLenovo:rvnLENOVO:rnHURONRIVER:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct13:cvrToBeFilledByO.E.M.:
  dmi.product.name: IdeaCentre A320 10065
  dmi.product.version: Lenovo
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu5
  version.libdrm2: libdrm2 2.4.30-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 
1:2.6.99.901+git20120126-0ubuntu2
  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

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