$ coredumpctl gdb 5503
           PID: 5503 (Xorg.bin)
           UID: 1000 (jb)
           GID: 1000 (jb)
        Signal: 6 (ABRT)
     Timestamp: Mon 2014-12-22 12:23:58 CET (1h 44min ago)
  Command Line: /usr/bin/Xorg.bin -nolisten tcp :0 vt1 -auth /tmp/serverauth.IwCQM2TIdH vt1
    Executable: /usr/bin/Xorg.bin
 Control Group: /user.slice/user-1000.slice/session-c4.scope
          Unit: session-c4.scope
         Slice: user-1000.slice
       Session: c4
     Owner UID: 1000 (jb)
       Boot ID: d90efc766674456f8614f2a6e07a6a0f
    Machine ID: 483c04c801e64b7d9a8718a29c59b9b7
      Hostname: myhost
      Coredump: /var/lib/systemd/coredump/core.Xorg\x2ebin.1000.d90efc766674456f8614f2a6e07a6a0f.5503.1419247438000000.lz4
       Message: Process 5503 (Xorg.bin) of user 1000 dumped core.

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Reading symbols from /usr/bin/Xorg.bin...(no debugging symbols found)...done.
[New LWP 5503]

warning: Could not load shared library symbols for linux-gate.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/Xorg.bin -nolisten tcp :0 vt1 -auth /tmp/serverauth.IwCQM2TIdH vt1'.
Program terminated with signal SIGABRT, Aborted.
#0  0xb777dbac in __kernel_vsyscall ()
(gdb) bt
#0  0xb777dbac in __kernel_vsyscall ()
#1  0xb739ff47 in raise () from /usr/lib/libc.so.6
#2  0xb73a1589 in abort () from /usr/lib/libc.so.6
#3  0x081e5f59 in OsAbort ()
#4  0x081ec5bc in FatalError ()
#5  0x080e1d5a in ?? ()
#6  0x080e270c in xf86CloseConsole ()
#7  0x080bc73d in ddxGiveUp ()
#8  0x080bc7e5 in AbortDDX ()
#9  0x081ebc5f in ?? ()
#10 0x081ec5f4 in FatalError ()
#11 0x080e1d5a in ?? ()
#12 0x080e1ff9 in xf86OpenConsole ()
#13 0x080be575 in InitOutput ()
#14 0x0807d75a in ?? ()
#15 0x0806774a in ?? ()
#16 0xb738be5e in __libc_start_main () from /usr/lib/libc.so.6
#17 0x08067778 in _start ()
(gdb)