GNU gdb (GDB) 7.9.1
Copyright (C) 2015 Free Software Foundation, Inc.
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Attaching to process 17942
Reading symbols from /usr/lib/xorg-server/Xorg...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libdbus-1.so.3...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libudev.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libgcrypt.so.20...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libdl.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libunwind.so.8...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libpciaccess.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libdrm.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libpixman-1.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libXfont.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libXau.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libsystemd.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxshmfence.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libXdmcp.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libm.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libc.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libpthread.so.0...(no debugging symbols found)...done.
[New LWP 17944]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Reading symbols from /usr/lib/librt.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libresolv.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libcap.so.2...(no debugging symbols found)...done.
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libgpg-error.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/liblzma.so.5...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libfreetype.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libfontenc.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/liblz4.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libattr.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libbz2.so.1.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libpng16.so.16...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libharfbuzz.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libglib-2.0.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libgraphite2.so.3...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libpcre.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/extensions/libglx.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libGL.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libexpat.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libglapi.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libXext.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libXdamage.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libXfixes.so.3...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libX11-xcb.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libX11.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-glx.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-dri2.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-dri3.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-present.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-randr.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-xfixes.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-render.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-shape.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb-sync.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libxcb.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libXxf86vm.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/drivers/ati_drv.so...done.
Reading symbols from /usr/lib/xorg/modules/drivers/radeon_drv.so...done.
Reading symbols from /usr/lib/libdrm_radeon.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/libexa.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/libfb.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/dri/r600_dri.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libdrm_nouveau.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libelf.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libLLVM-3.6.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libstdc++.so.6...done.
Reading symbols from /usr/lib/libgcc_s.so.1...done.
Reading symbols from /usr/lib/libffi.so.6...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libedit.so.0...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libncursesw.so.5...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libtxc_dxtn.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/input/evdev_drv.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libmtdev.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libevdev.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/xorg/modules/input/synaptics_drv.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libnss_files.so.2...(no debugging symbols found)...done.
0x00007f4faef03b03 in select () from /usr/lib/libc.so.6
(gdb) cont
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x00007f4fa993f3b2 in RegionNil (reg=<optimized out>)
    at /usr/include/xorg/regionstr.h:74
(gdb) bt f
#0  0x00007f4fa993f3b2 in RegionNil (reg=<optimized out>)
    at /usr/include/xorg/regionstr.h:74
No locals.
#1  RegionNotEmpty (_pReg=<optimized out>) at /usr/include/xorg/regionstr.h:182
No locals.
#2  radeon_dirty_update (screen=0xe80a60) at radeon_kms.c:312
        region = <optimized out>
        ent = 0x1661c90
#3  RADEONBlockHandler_KMS (arg=<optimized out>, pTimeout=<optimized out>, 
    pReadmask=<optimized out>) at radeon_kms.c:543
        pScreen = <optimized out>
        pScrn = 0xe46bc0
        info = <optimized out>
#4  0x000000000043d84a in BlockHandler ()
No symbol table info available.
#5  0x000000000058f4c3 in WaitForSomething ()
No symbol table info available.
#6  0x0000000000438be1 in ?? ()
No symbol table info available.
#7  0x000000000043cf0b in ?? ()
No symbol table info available.
#8  0x00007f4faee43790 in __libc_start_main () from /usr/lib/libc.so.6
No symbol table info available.
#9  0x0000000000427319 in _start ()
No symbol table info available.
(gdb) b
#0  0x00007f4fa993f3b2 in RegionNil (reg=<optimized out>)
    at /usr/include/xorg/regionstr.h:74
No locals.
#1  RegionNotEmpty (_pReg=<optimized out>) at /usr/include/xorg/regionstr.h:182
No locals.
#2  radeon_dirty_update (screen=0xe80a60) at radeon_kms.c:312
        region = <optimized out>
        ent = 0x1661c90
#3  RADEONBlockHandler_KMS (arg=<optimized out>, pTimeout=<optimized out>, 
    pReadmask=<optimized out>) at radeon_kms.c:543
        pScreen = <optimized out>
        pScrn = 0xe46bc0
        info = <optimized out>
#4  0x000000000043d84a in BlockHandler ()
No symbol table info available.
#5  0x000000000058f4c3 in WaitForSomething ()
No symbol table info available.
#6  0x0000000000438be1 in ?? ()
No symbol table info available.
#7  0x000000000043cf0b in ?? ()
No symbol table info available.
#8  0x00007f4faee43790 in __libc_start_main () from /usr/lib/libc.so.6
No symbol table info available.
#9  0x0000000000427319 in _start ()
No symbol table info available.
(gdb) 
#0  0x00007f4fa993f3b2 in RegionNil (reg=<optimized out>)
    at /usr/include/xorg/regionstr.h:74
No locals.
#1  RegionNotEmpty (_pReg=<optimized out>) at /usr/include/xorg/regionstr.h:182
No locals.
#2  radeon_dirty_update (screen=0xe80a60) at radeon_kms.c:312
        region = <optimized out>
        ent = 0x1661c90
#3  RADEONBlockHandler_KMS (arg=<optimized out>, pTimeout=<optimized out>, 
    pReadmask=<optimized out>) at radeon_kms.c:543
        pScreen = <optimized out>
        pScrn = 0xe46bc0
        info = <optimized out>
#4  0x000000000043d84a in BlockHandler ()
No symbol table info available.
#5  0x000000000058f4c3 in WaitForSomething ()
No symbol table info available.
#6  0x0000000000438be1 in ?? ()
No symbol table info available.
#7  0x000000000043cf0b in ?? ()
No symbol table info available.
#8  0x00007f4faee43790 in __libc_start_main () from /usr/lib/libc.so.6
No symbol table info available.
#9  0x0000000000427319 in _start ()
No symbol table info available.
(gdb) detach
Detaching from program: /usr/lib/xorg-server/Xorg, process 17942
(gdb) quit