GNU gdb (GDB) 7.7 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-unknown-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/bin/Xorg...(no debugging symbols found)...done. (gdb) 341 Undefined command: "341". Try "help". (gdb) attcaach 341 Attaching to program: /usr/bin/Xorg, process 341 warning: Could not load shared library symbols for linux-vdso.so.1. Do you need "set solib-search-path" or "set sysroot"? Reading symbols from /usr/lib/libudev.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libudev.so.1 Reading symbols from /usr/lib/libgcrypt.so.20...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgcrypt.so.20 Reading symbols from /usr/lib/libdl.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libdl.so.2 Reading symbols from /usr/lib/libpciaccess.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libpciaccess.so.0 Reading symbols from /usr/lib/libpthread.so.0...(no debugging symbols found)...done. [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". Loaded symbols for /usr/lib/libpthread.so.0 Reading symbols from /usr/lib/libdrm.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libdrm.so.2 Reading symbols from /usr/lib/libpixman-1.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libpixman-1.so.0 Reading symbols from /usr/lib/libXfont.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXfont.so.1 Reading symbols from /usr/lib/libXau.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXau.so.6 Reading symbols from /usr/lib/libxshmfence.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libxshmfence.so.1 Reading symbols from /usr/lib/libXdmcp.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libXdmcp.so.6 Reading symbols from /usr/lib/libm.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libm.so.6 Reading symbols from /usr/lib/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libc.so.6 Reading symbols from /usr/lib/librt.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/librt.so.1 Reading symbols from /usr/lib/libgpg-error.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgpg-error.so.0 Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 Reading symbols from /usr/lib/libfreetype.so.6...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libfreetype.so.6 Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libz.so.1 Reading symbols from /usr/lib/libfontenc.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libfontenc.so.1 Reading symbols from /usr/lib/libbz2.so.1.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libbz2.so.1.0 Reading symbols from /usr/lib/libpng16.so.16...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libpng16.so.16 Reading symbols from /usr/lib/libharfbuzz.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libharfbuzz.so.0 Reading symbols from /usr/lib/libglib-2.0.so.0...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libglib-2.0.so.0 Reading symbols from /usr/lib/libgraphite2.so.3...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgraphite2.so.3 Reading symbols from /usr/lib/libpcre.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libpcre.so.1 Reading symbols from /usr/lib/libgcc_s.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgcc_s.so.1 Reading symbols from /usr/lib/xorg/modules/extensions/libglx.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/extensions/libglx.so Reading symbols from /usr/lib/libnvidia-tls.so.337.12...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libnvidia-tls.so.337.12 Reading symbols from /usr/lib/libnvidia-glcore.so.337.12...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libnvidia-glcore.so.337.12 Reading symbols from /usr/lib/xorg/modules/drivers/nvidia_drv.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/drivers/nvidia_drv.so Reading symbols from /usr/lib/xorg/modules/libfb.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/libfb.so Reading symbols from /usr/lib/xorg/modules/libwfb.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/libwfb.so Reading symbols from /usr/lib/xorg/modules/input/evdev_drv.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/input/evdev_drv.so Reading symbols from /usr/lib/libmtdev.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmtdev.so.1 0x00007f646c586fb3 in __select_nocancel () from /usr/lib/libc.so.6 (gdb) cont Continuing. Program received signal SIGUSR1, User defined signal 1. 0x0000000000532480 in XkbComputeDerivedState () (gdb) backtrace full #0 0x0000000000532480 in XkbComputeDerivedState () No symbol table info available. #1 0x000000000053e54b in XkbHandleActions () No symbol table info available. #2 0x0000000000537905 in AccessXFilterPressEvent () No symbol table info available. #3 0x0000000000566f39 in mieqProcessDeviceEvent () No symbol table info available. #4 0x0000000000567077 in mieqProcessInputEvents () No symbol table info available. #5 0x0000000000473069 in ProcessInputEvents () No symbol table info available. #6 0x00000000004359d2 in ?? () No symbol table info available. #7 0x0000000000439aaa in ?? () No symbol table info available. #8 0x00007f646c4c9b05 in __libc_start_main () from /usr/lib/libc.so.6 No symbol table info available. #9 0x000000000042507e in _start () No symbol table info available. (gdb) backtrace full #0 0x0000000000532480 in XkbComputeDerivedState () No symbol table info available. #1 0x000000000053e54b in XkbHandleActions () No symbol table info available. #2 0x0000000000537905 in AccessXFilterPressEvent () No symbol table info available. #3 0x0000000000566f39 in mieqProcessDeviceEvent () No symbol table info available. #4 0x0000000000567077 in mieqProcessInputEvents () No symbol table info available. #5 0x0000000000473069 in ProcessInputEvents () No symbol table info available. #6 0x00000000004359d2 in ?? () No symbol table info available. #7 0x0000000000439aaa in ?? () No symbol table info available. #8 0x00007f646c4c9b05 in __libc_start_main () from /usr/lib/libc.so.6 No symbol table info available. #9 0x000000000042507e in _start () No symbol table info available. (gdb) exit Undefined command: "exit". Try "help". (gdb)