Here's my glxinfo output when Xserver is not crashing (started with
Composite *enabled*)

** Attachment added: "glxinfo.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1754177/+attachment/5072328/+files/glxinfo.txt

** Description changed:

  For certain games I disable the Composite extension in my
  /etc/X11/xorg.conf when using a non-composited window manager like
  openbox, fluxbox or marco.
  
  This worked flawlessly in all previous Ubuntu versions including 17.10
  (artful).
  
  This stopped working with Ubuntu 18.04 (bionic). I tested with the
  mainline kernel 4.16 and the current 4.15 kernel in bionic-proposed and
  bionic. Xserver will crash with "Option "Composite" "0/False/Disable"
  
- When I comment out the line it works again with this xorg.conf. I can
+ When I comment out the specific line in the Extensions section (that
+ means *enabling* Composite) it works again with this xorg.conf. I can
  also do other stuff like disabling DRI3 or AIGLX. No crashes in these
  cases.
  
  My xorg.conf:
  Section "Device"
  Identifier "Intel GMA45" ##just a trivial name as Identifier
  Driver "intel"
  EndSection
  
  Section "Extensions"
  Option "Composite" "0"
  EndSection
  
  It has a backtrace and caughts signal 6.
  
  My Xorg.0.log:
  [    35.779]
  X.Org X Server 1.19.6
  Release Date: 2017-12-20
  [    35.781] X Protocol Version 11, Revision 0
  [    35.782] Build Operating System: Linux 4.4.0-101-generic x86_64 Ubuntu
  [    35.783] Current Operating System: Linux bdcomputerclub 
4.16.0-994-generic #201803022100 SMP Sat Mar 3 02:03:37 UTC 2018 x86_64
  [    35.784] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.16.0-994-generic 
root=UUID=cb2eb60a-9760-4805-95eb-0db77947ac82 ro quiet splash
  [    35.787] Build Date: 22 February 2018  08:04:42PM
  [    35.788] xorg-server 2:1.19.6-1ubuntu2 (For technical support please see 
http://www.ubuntu.com/support)
  [    35.789] Current version of pixman: 0.34.0
  [    35.792]  Before reporting problems, check http://wiki.x.org
   to make sure that you have the latest version.
  [    35.792] Markers: (--) probed, (**) from config file, (==) default 
setting,
   (++) from command line, (!!) notice, (II) informational,
   (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
  [    35.799] (==) Log file: "/home/christian/.local/share/xorg/Xorg.0.log", 
Time: Wed Mar  7 22:43:35 2018
  [    35.801] (==) Using config file: "/etc/X11/xorg.conf"
  [    35.803] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
  [    35.803] (==) No Layout section.  Using the first Screen section.
  [    35.803] (==) No screen section available. Using defaults.
  [    35.803] (**) |-->Screen "Default Screen Section" (0)
  [    35.803] (**) |   |-->Monitor "<default monitor>"
  [    35.804] (==) No device specified for screen "Default Screen Section".
   Using the first device section listed.
  [    35.804] (**) |   |-->Device "Intel GMA45 Express Chipset"
  [    35.804] (==) No monitor specified for screen "Default Screen Section".
   Using a default monitor configuration.
  [    35.804] (==) Automatically adding devices
  [    35.804] (==) Automatically enabling devices
  [    35.804] (==) Automatically adding GPU devices
  [    35.804] (==) Automatically binding GPU devices
  [    35.804] (==) Max clients allowed: 256, resource mask: 0x1fffff
  [    35.809] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not 
exist.
  [    35.809]  Entry deleted from font path.
  [    35.822] (==) FontPath set to:
   /usr/share/fonts/X11/misc,
   /usr/share/fonts/X11/100dpi/:unscaled,
   /usr/share/fonts/X11/75dpi/:unscaled,
   /usr/share/fonts/X11/Type1,
   /usr/share/fonts/X11/100dpi,
   /usr/share/fonts/X11/75dpi,
   built-ins
  [    35.822] (==) ModulePath set to "/usr/lib/xorg/modules"
  [    35.822] (**) Extension "Composite" is disabled
  [    35.822] (II) The server relies on udev to provide the list of input 
devices.
   If no devices become available, reconfigure udev or disable AutoAddDevices.
  [    35.822] (II) Loader magic: 0x55cfd2964020
  [    35.822] (II) Module ABI versions:
  [    35.822]  X.Org ANSI C Emulation: 0.4
  [    35.822]  X.Org Video Driver: 23.0
  [    35.822]  X.Org XInput driver : 24.1
  [    35.822]  X.Org Server Extension : 10.0
  [    35.824] (++) using VT number 1
  
  [    35.827] (II) systemd-logind: took control of session 
/org/freedesktop/login1/session/_32
  [    35.828] (II) xfree86: Adding drm device (/dev/dri/card0)
  [    35.829] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 11 
paused 0
  [    35.832] (--) PCI:*(0:0:2:0) 8086:2a42:1025:0459 rev 9, Mem @ 
0xd0000000/4194304, 0xc0000000/268435456, I/O @ 0x000050f0/8, BIOS @ 
0x????????/131072
  [    35.832] (--) PCI: (0:0:2:1) 8086:2a43:1025:0459 rev 9, Mem @ 
0xd3400000/1048576
  [    35.833] (II) LoadModule: "glx"
  [    35.836] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
  [    35.850] (II) Module glx: vendor="X.Org Foundation"
  [    35.850]  compiled for 1.19.6, module version = 1.0.0
  [    35.850]  ABI class: X.Org Server Extension, version 10.0
  [    35.850] (II) LoadModule: "intel"
  [    35.850] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
  [    35.856] (II) Module intel: vendor="X.Org Foundation"
  [    35.856]  compiled for 1.19.5, module version = 2.99.917
  [    35.856]  Module class: X.Org Video Driver
  [    35.856]  ABI class: X.Org Video Driver, version 23.0
  [    35.856] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
   i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
   915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
   Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
   GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
  [    35.856] (II) intel: Driver for Intel(R) HD Graphics
  [    35.856] (II) intel: Driver for Intel(R) Iris(TM) Graphics
  [    35.856] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics
  [    35.856] xf86EnableIOPorts: failed to set IOPL for I/O (Operation not 
permitted)
  [    35.858] (II) intel(0): Using Kernel Mode Setting driver: i915, version 
1.6.0 20180221
  [    35.858] (II) intel(0): SNA compiled: xserver-xorg-video-intel 
2:2.99.917+git20171229-1 (Timo Aaltonen <tjaal...@debian.org>)
  [    35.858] (II) intel(0): SNA compiled for use with valgrind
  [    35.876] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card 
support
  [    35.877] (--) intel(0): Integrated Graphics Chipset: Intel(R) GM45
  [    35.877] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3; using a maximum 
of 2 threads
  [    35.877] (II) intel(0): Creating default Display subsection in Screen 
section
   "Default Screen Section" for depth/fbbpp 24/32
  [    35.878] (==) intel(0): Depth 24, (--) framebuffer bpp 32
  [    35.878] (==) intel(0): RGB weight 888
  [    35.878] (==) intel(0): Default visual is TrueColor
  [    35.880] (II) intel(0): Output LVDS1 has no monitor section
  [    35.894] (**) intel(0): Found backlight control interface intel_backlight 
(type 'raw') for output LVDS1
  [    35.894] (II) intel(0): Enabled output LVDS1
  [    35.894] (II) intel(0): Output VGA1 has no monitor section
  [    35.894] (II) intel(0): Enabled output VGA1
  [    35.894] (II) intel(0): Output DP1 has no monitor section
  [    35.894] (II) intel(0): Enabled output DP1
  [    35.894] (--) intel(0): Using a maximum size of 256x256 for hardware 
cursors
  [    35.894] (II) intel(0): Output VIRTUAL1 has no monitor section
  [    35.894] (II) intel(0): Enabled output VIRTUAL1
  [    35.895] (--) intel(0): Output LVDS1 using initial mode 1366x768 on pipe 0
  [    35.895] (==) intel(0): TearFree disabled
  [    35.895] (==) intel(0): Using gamma correction (1.0, 1.0, 1.0)
  [    35.895] (==) intel(0): DPI set to (96, 96)
  [    35.895] (II) Loading sub module "dri3"
  [    35.895] (II) LoadModule: "dri3"
  [    35.895] (II) Module "dri3" already built-in
  [    35.895] (II) Loading sub module "dri2"
  [    35.895] (II) LoadModule: "dri2"
  [    35.895] (II) Module "dri2" already built-in
  [    35.895] (II) Loading sub module "present"
  [    35.895] (II) LoadModule: "present"
  [    35.895] (II) Module "present" already built-in
  [    35.895] (==) Depth 24 pixmap format is 32 bpp
  [    35.901] (II) intel(0): SNA initialized with Eaglelake (gen4.5) backend
  [    35.901] (==) intel(0): Backing store disabled
  [    35.901] (==) intel(0): Silken mouse enabled
  [    35.902] (II) intel(0): HW Cursor enabled
  [    35.902] (II) intel(0): RandR 1.2 enabled, ignore the following RandR 
disabled message.
  [    35.903] (==) intel(0): DPMS enabled
  [    35.904] (==) intel(0): Display hotplug detection enabled
  [    35.904] (II) intel(0): [XvMC] xvmc_vld driver initialized.
  [    35.904] (II) intel(0): [DRI2] Setup complete
  [    35.904] (II) intel(0): [DRI2]   DRI driver: i965
  [    35.904] (II) intel(0): [DRI2]   VDPAU driver: va_gl
  [    35.904] (II) intel(0): direct rendering: DRI2 enabled
  [    35.904] (II) intel(0): hardware support for Present enabled
  [    35.904] (--) RandR disabled
  [    35.910] (II) SELinux: Disabled on system
  [    35.961] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
  [    35.962] (II) AIGLX: enabled GLX_ARB_create_context
  [    35.962] (II) AIGLX: enabled GLX_ARB_create_context_profile
  [    35.962] (II) AIGLX: enabled GLX_EXT_create_context_es{,2}_profile
  [    35.962] (II) AIGLX: enabled GLX_INTEL_swap_event
  [    35.962] (II) AIGLX: enabled GLX_SGI_swap_control
  [    35.962] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB
  [    35.962] (II) AIGLX: enabled GLX_ARB_fbconfig_float
  [    35.962] (II) AIGLX: enabled GLX_EXT_fbconfig_packed_float
  [    35.962] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
  [    35.962] (EE)
  [    35.962] (EE) Backtrace:
  [    35.962] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4d) [0x55cfd26d991d]
  [    35.962] (EE) 1: /usr/lib/xorg/Xorg (0x55cfd2521000+0x1bc6b9) 
[0x55cfd26dd6b9]
  [    35.962] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 
(0x7fa343473000+0x12890) [0x7fa343485890]
  [    35.962] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0xc7) 
[0x7fa3430c0e97]
  [    35.962] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x141) 
[0x7fa3430c2801]
  [    35.963] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (0x7fa343082000+0x3039a) 
[0x7fa3430b239a]
  [    35.963] (EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (0x7fa343082000+0x30412) 
[0x7fa3430b2412]
  [    35.963] (EE) 7: /usr/lib/xorg/Xorg (0x55cfd2521000+0x3ec17) 
[0x55cfd255fc17]
  [    35.963] (EE) 8: /usr/lib/xorg/Xorg (0x55cfd2521000+0xe26df) 
[0x55cfd26036df]
  [    35.963] (EE) 9: /usr/lib/xorg/modules/extensions/libglx.so 
(0x7fa341437000+0x288d7) [0x7fa34145f8d7]
  [    35.963] (EE) 10: /usr/lib/xorg/modules/extensions/libglx.so 
(0x7fa341437000+0x2f851) [0x7fa341466851]
  [    35.963] (EE) 11: /usr/lib/xorg/modules/extensions/libglx.so 
(0x7fa341437000+0x27315) [0x7fa34145e315]
  [    35.963] (EE) 12: /usr/lib/xorg/Xorg (InitExtensions+0x3d) 
[0x55cfd25e708d]
  [    35.963] (EE) 13: /usr/lib/xorg/Xorg (0x55cfd2521000+0x56d1f) 
[0x55cfd2577d1f]
  [    35.963] (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 
(__libc_start_main+0xe7) [0x7fa3430a3b97]
  [    35.963] (EE) 15: /usr/lib/xorg/Xorg (_start+0x2a) [0x55cfd2561bba]
  [    35.963] (EE)
  [    35.963] (EE)
  Fatal server error:
  [    35.963] (EE) Caught signal 6 (Aborted). Server aborting
  [    35.963] (EE)
  [    35.963] (EE)
  Please consult the The X.Org Foundation support
    at http://wiki.x.org
   for help.
  [    35.963] (EE) Please also check the log file at 
"/home/christian/.local/share/xorg/Xorg.0.log" for additional information.
  [    35.963] (EE)
  [    36.019] (EE) Server terminated with error (1). Closing log file.

-- 
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1754177

Title:
  [bionic] xserver / startx crashes with Composite Disabled in xorg.conf

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