with O0 -g3 it was not so easy to trigger, but:

Program received signal SIGSEGV, Segmentation fault.
0x00007f1472b8b88c in has_offload_slaves (sna=0x7f1471868000)
    at sna_accel.c:14747
14747   ScreenPtr screen = sna->scrn->pScreen;
(gdb) bt full
#0  0x00007f1472b8b88c in has_offload_slaves (sna=0x7f1471868000)
    at sna_accel.c:14747
        screen = 0x2085620
        dirty = 0x7fff0733c890
#1  0x00007f1472b8ba3b in stop_flush (sna=0x7f1471868000, scanout=0x207aa60)
    at sna_accel.c:14810
No locals.
#2  0x00007f1472b8c1bf in sna_accel_flush (sna=0x7f1471868000)
    at sna_accel.c:15032
        priv = 0x207aa60
        busy = false
#3  0x00007f1472b8cf29 in sna_accel_block_handler (sna=0x7f1471868000, 
    tv=0x7fff0733c998) at sna_accel.c:15472
No locals.
#4  0x00007f1472ba67d8 in sna_block_handler (arg=0x2054420, 
    timeout=0x7fff0733c998, read_mask=0x81c340 <LastSelectMask>)
    at sna_driver.c:557
        sna = 0x7f1471868000
        tv = 0x7fff0733c998
#5  0x000000000043d9c4 in BlockHandler (
    pTimeout=pTimeout@entry=0x7fff0733c998, 
    pReadmask=pReadmask@entry=0x81c340 <LastSelectMask>) at dixutils.c:387
        i = 0
---Type <return> to continue, or q <return> to quit---
        j = <optimized out>
#6  0x0000000000469e84 in WaitForSomething (
    pClientsReady=pClientsReady@entry=0x22e29d0) at WaitFor.c:210
        i = <optimized out>
        waittime = {tv_sec = 296, tv_usec = 432000}
        wt = 0x7fff0733c9a0
        timeout = <optimized out>
        clientsReadable = {fds_bits = {0 <repeats 16 times>}}
        clientsWritable = {fds_bits = {1, 1, 0, 34103520, 0, 0, 33899552, 
            5413855, 33899552, 46103504, 77595664, 206158430224, 
            140733314222960, 140733314222752, 46041312, 264619602646}}
        selecterr = <optimized out>
        nready = 0
        devicesReadable = {fds_bits = {57, 1, 140733314222912, 32, 46103344, 
            4689382, 32, 46103344, 51602000, 4651885, 0, 32, 0, 0, 0, 
            46103440}}
        now = <optimized out>
        someReady = 0
#7  0x0000000000439581 in Dispatch () at dispatch.c:357
        clientReady = 0x22e29d0
        result = <optimized out>
        client = <optimized out>
        nready = <optimized out>
---Type <return> to continue, or q <return> to quit---
        icheck = 0x8163f0 <checkForInput>
        start_tick = <optimized out>
#8  0x00000000004282da in main (argc=9, argv=0x7fff0733cda8, 
    envp=<optimized out>) at main.c:298
        i = <optimized out>
        alwaysCheckForInput = {0, 1}
(gdb) 

Valgrind will have to wait until tomorrow at least...

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1203273

Title:
  Xorg crashed with SIGABRT in has_offload_slaves()

Status in X.org xf86-video-intel:
  Confirmed
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Incomplete

Bug description:
  For no reason I was logged out. I saw some terminal text about apache2
  and tomcat (what ever that is) then brought to login screen again. I
  type in my password the desktop appears again and the error report
  dialog >> and now I'm here reporting to help the cause.

  ProblemType: Crash
  DistroRelease: Ubuntu 13.10
  Package: xserver-xorg-core 2:1.14.2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.10.0-4.13-generic 3.10.1
  Uname: Linux 3.10.0-4-generic x86_64
  ApportVersion: 2.11-0ubuntu1
  Architecture: amd64
  CrashCounter: 1
  Date: Sat Jul 20 06:47:18 2013
  ExecutablePath: /usr/bin/Xorg
  InstallationDate: Installed on 2013-07-19 (0 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130717)
  MarkForUpload: True
  ProcCmdline: /usr/bin/X -core :0 -auth /var/run/lightdm/root/:0 -nolisten tcp 
vt7 -novtswitch -background none
  ProcEnviron:
   
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
   ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
   BlockHandler ()
   WaitForSomething ()
   ?? ()
  Title: Xorg crashed with SIGABRT in BlockHandler()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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