GNU gdb (Gentoo 7.10.1 vanilla) 7.10.1
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Reading symbols from /usr/bin/Xorg...Reading symbols from /usr/lib64/debug//usr/bin/Xorg.debug...done.
done.
(gdb) attach 14777
Attaching to program: /usr/bin/Xorg, process 14777
Reading symbols from /usr/lib64/libcrypto.so.1.0.0...(no debugging symbols found)...done.
Reading symbols from /lib64/libdl.so.2...Reading symbols from /usr/lib64/debug//lib64/libdl-2.21.so.debug...done.
done.
Reading symbols from /usr/lib64/libpciaccess.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libdrm.so.2...Reading symbols from /usr/lib64/debug//usr/lib64/libdrm.so.2.4.0.debug...done.
done.
Reading symbols from /usr/lib64/libpixman-1.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libXfont.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libXau.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxshmfence.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libXdmcp.so.6...(no debugging symbols found)...done.
Reading symbols from /lib64/libm.so.6...Reading symbols from /usr/lib64/debug//lib64/libm-2.21.so.debug...done.
done.
Reading symbols from /lib64/libc.so.6...Reading symbols from /usr/lib64/debug//lib64/libc-2.21.so.debug...done.
done.
Reading symbols from /lib64/libz.so.1...(no debugging symbols found)...done.
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib64/debug//lib64/ld-2.21.so.debug...done.
done.
Reading symbols from /lib64/libpthread.so.0...Reading symbols from /usr/lib64/debug//lib64/libpthread-2.21.so.debug...done.
done.
[New LWP 14782]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Reading symbols from /usr/lib64/libfreetype.so.6...(no debugging symbols found)...done.
Reading symbols from /lib64/libbz2.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libfontenc.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libpng16.so.16...(no debugging symbols found)...done.
Reading symbols from /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libgcc_s.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/xorg/modules/extensions/libglx.so...Reading symbols from /usr/lib64/debug//usr/lib64/xorg/modules/extensions/libglx.so.debug...done.
done.
Reading symbols from /usr/lib64/libGL.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libexpat.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libglapi.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libXext.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libXdamage.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libXfixes.so.3...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libX11-xcb.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libX11.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-glx.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-dri2.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-dri3.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-present.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-randr.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-xfixes.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-render.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-shape.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb-sync.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libxcb.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libXxf86vm.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/xorg/modules/drivers/intel_drv.so...Reading symbols from /usr/lib64/debug//usr/lib64/xorg/modules/drivers/intel_drv.so.debug...done.
done.
Reading symbols from /lib64/libudev.so.1...(no debugging symbols found)...done.
Reading symbols from /lib64/librt.so.1...Reading symbols from /usr/lib64/debug//lib64/librt-2.21.so.debug...done.
done.
Reading symbols from /lib64/libresolv.so.2...Reading symbols from /usr/lib64/debug//lib64/libresolv-2.21.so.debug...done.
done.
Reading symbols from /lib64/libcap.so.2...(no debugging symbols found)...done.
Reading symbols from /lib64/libattr.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/xorg/modules/input/mouse_drv.so...Reading symbols from /usr/lib64/debug//usr/lib64/xorg/modules/input/mouse_drv.so.debug...done.
done.
Reading symbols from /usr/lib64/xorg/modules/input/kbd_drv.so...Reading symbols from /usr/lib64/debug//usr/lib64/xorg/modules/input/kbd_drv.so.debug...done.
done.
Reading symbols from /usr/lib64/dri/i965_dri.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib64/libdrm_intel.so.1...Reading symbols from /usr/lib64/debug//usr/lib64/libdrm_intel.so.1.0.0.debug...done.
done.
Reading symbols from /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libstdc++.so.6...(no debugging symbols found)...done.
0x00007ff4386b8ce3 in select () at ../sysdeps/unix/syscall-template.S:81
81	../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) cont
Continuing.

Program received signal SIGABRT, Aborted.
0x00007ff43860b387 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
55	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt full
#0  0x00007ff43860b387 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 14777
        selftid = 14777
#1  0x00007ff43860c71a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x303030303020702d, sa_sigaction = 0x303030303020702d}, sa_mask = {__val = {3475143045726351408, 
              7378645556122361904, 3472336220495885108, 7003999459897453872, 8223625903104091443, 3616443484039294253, 4195155967701168177, 
              3546647611519807792, 2314885530819769652, 2314885530818453536, 7795484802351636512, 3270858179373064809, 751946305025224242, 
              7292279094193317431, 7378645706714656824, 0}}, sa_flags = 86, sa_restorer = 0x7ffec1139a20}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007ff438649dc0 in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7ff43873d138 "*** Error in `%s': %s: 0x%s ***\n")
    at ../sysdeps/posix/libc_fatal.c:175
        ap = {{gp_offset = 40, fp_offset = 0, overflow_arg_area = 0x7ffec1139a30, reg_save_area = 0x7ffec11399c0}}
        fd = 27
        on_2 = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
        written = <optimized out>
#3  0x00007ff43864f27e in malloc_printerr (action=3, str=0x7ff43873d1d8 "free(): invalid next size (normal)", ptr=<optimized out>) at malloc.c:4960
        buf = "00000000016b12d0"
        cp = <optimized out>
#4  0x00007ff43864fa6b in _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3831
        size = <optimized out>
        fb = <optimized out>
        nextchunk = <optimized out>
        nextsize = <optimized out>
        nextinuse = <optimized out>
        prevsize = <optimized out>
        bck = <optimized out>
        fwd = <optimized out>
        errstr = <optimized out>
        locked = <optimized out>
        __func__ = "_int_free"
#5  0x000000000043422f in DoGetImage (planemask=<optimized out>, height=32, width=32, y=47, x=4, drawable=<optimized out>, format=<optimized out>, 
    client=<optimized out>) at /var/tmp/portage/x11-base/xorg-server-1.17.4/work/xorg-server-1.17.4/dix/dispatch.c:2214
        pBoundingDraw = <optimized out>
        linesPerBuf = 32
        relx = <optimized out>
        widthBytesLine = 128
        plane = <optimized out>
        pVisibleRegion = <optimized out>
        rely = <optimized out>
        xgi = {type = 1 '\001', depth = 24 '\030', sequenceNumber = 19869, length = 1024, visual = 0, pad3 = 0, pad4 = 0, pad5 = 0, pad6 = 0, 
          pad7 = 0}
        pDraw = 0x16abac0
        nlines = <optimized out>
        rc = <optimized out>
        linesDone = <optimized out>
        length = <optimized out>
        pBuf = 0x16b12d0 ""
#6  ProcGetImage (client=<optimized out>) at /var/tmp/portage/x11-base/xorg-server-1.17.4/work/xorg-server-1.17.4/dix/dispatch.c:2225
        stuff = <optimized out>
#7  0x0000000000437137 in Dispatch () at /var/tmp/portage/x11-base/xorg-server-1.17.4/work/xorg-server-1.17.4/dix/dispatch.c:429
        clientReady = 0x13cab50
        result = <optimized out>
        client = 0x13d7de0
        nready = 0
        icheck = 0x81d3b0 <checkForInput>
        start_tick = 20
#8  0x000000000043b23b in dix_main (argc=5, argv=0x7ffec1139d68, envp=<optimized out>)
    at /var/tmp/portage/x11-base/xorg-server-1.17.4/work/xorg-server-1.17.4/dix/main.c:298
        i = <optimized out>
        alwaysCheckForInput = {0, 1}
#9  0x00007ff4385f87b0 in __libc_start_main (main=0x425780 <main>, argc=5, argv=0x7ffec1139d68, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7ffec1139d58) at libc-start.c:289
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 101142467649430143, 4347792, 140732137708896, 0, 0, -100532617602702721, 
                -103824109124492673}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x5980d0 <__libc_csu_init>, 0x7ffec1139d68}, data = {
              prev = 0x0, cleanup = 0x0, canceltype = 5865680}}}
        not_first_call = <optimized out>
#10 0x00000000004257b9 in _start ()
No symbol table info available.
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb) quit