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 2546
Attaching to program: /usr/bin/Xorg, process 2546
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 2591]
[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.
0x00007fa3c0a77ce3 in select () at ../sysdeps/unix/syscall-template.S:81
81	../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) handle SIGPIPE nostop noprint pass
Signal        Stop	Print	Pass to program	Description
SIGPIPE       No	No	Yes		Broken pipe
(gdb) cont
Continuing.

Program received signal SIGSEGV, Segmentation fault.
_int_malloc (av=av@entry=0x7fa3c0d2cc00 <main_arena>, bytes=bytes@entry=14960) at malloc.c:3576
3576	malloc.c: No such file or directory.
(gdb) bt full
#0  _int_malloc (av=av@entry=0x7fa3c0d2cc00 <main_arena>, bytes=bytes@entry=14960) at malloc.c:3576
        iters = <optimized out>
        nb = <optimized out>
        idx = 113
        bin = 0x7fa3c0d2d358 <main_arena+1880>
        victim = 0x3cc078054f00806
        size = <optimized out>
        victim_index = <optimized out>
        remainder = <optimized out>
        remainder_size = <optimized out>
        block = <optimized out>
        bit = <optimized out>
        map = <optimized out>
        fwd = <optimized out>
        bck = <optimized out>
        errstr = 0x0
        __func__ = "_int_malloc"
#1  0x00007fa3c0a12675 in __libc_calloc (n=<optimized out>, elem_size=<optimized out>) at malloc.c:3210
        av = 0x7fa3c0d2cc00 <main_arena>
        oldtop = 0x309af90
        p = <optimized out>
        bytes = 14960
        sz = 14960
        csz = <optimized out>
        oldtopsize = 2895984
        mem = <optimized out>
        clearsize = <optimized out>
        nclears = <optimized out>
        d = <optimized out>
        hook = <optimized out>
        __func__ = "__libc_calloc"
#2  0x0000000000434025 in DoGetImage (planemask=<optimized out>, height=20, width=187, y=2, x=2, drawable=<optimized out>, format=2, 
    client=0x1cc57a0) at /var/tmp/portage/x11-base/xorg-server-1.17.4/work/xorg-server-1.17.4/dix/dispatch.c:2144
        pBoundingDraw = <optimized out>
        linesPerBuf = 20
        relx = <optimized out>
        widthBytesLine = 748
        plane = 0
        pVisibleRegion = 0x0
        rely = <optimized out>
        xgi = {type = 1 '\001', depth = 24 '\030', sequenceNumber = 16289, length = 3740, visual = 0, pad3 = 0, pad4 = 0, pad5 = 0, pad6 = 0, 
          pad7 = 0}
        pDraw = 0x2b17450
        nlines = <optimized out>
        rc = <optimized out>
        linesDone = <optimized out>
        length = <optimized out>
        pBuf = <optimized out>
#3  ProcGetImage (client=0x1cc57a0) at /var/tmp/portage/x11-base/xorg-server-1.17.4/work/xorg-server-1.17.4/dix/dispatch.c:2225
        stuff = <optimized out>
#4  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 = 0x1c93b50
        result = <optimized out>
        client = 0x1cc57a0
        nready = 0
        icheck = 0x81d3b0 <checkForInput>
        start_tick = 11525
#5  0x000000000043b23b in dix_main (argc=5, argv=0x7fff18159448, 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}
#6  0x00007fa3c09b77b0 in __libc_start_main (main=0x425780 <main>, argc=5, argv=0x7fff18159448, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fff18159438) at libc-start.c:289
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 8461978652658364004, 4347792, 140733597455424, 0, 0, -8462039019622764956, 
                -8491117884308459932}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x5980d0 <__libc_csu_init>, 0x7fff18159448}, data = {
              prev = 0x0, cleanup = 0x0, canceltype = 5865680}}}
        not_first_call = <optimized out>
#7  0x00000000004257b9 in _start ()
No symbol table info available.
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb) quit