samco@samco-laptop:~/linuxcnc$ gdb /usr/bin/python 1701
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/python...(no debugging symbols found)...done.
Attaching to program: /usr/bin/python, process 1701
Reading symbols from /usr/lib/libstdc++.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libstdc++.so.6
Reading symbols from /lib/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread 0x7fc02b7c1700 (LWP 1706)]
[New Thread 0x7fc035fe2700 (LWP 1702)]
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
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Reading symbols from /lib/libssl.so.0.9.8...(no debugging symbols found)...done.
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Reading symbols from /lib/libcrypto.so.0.9.8...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/python2.6/lib-dynload/_tkinter.so...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libX11.so.6...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libfontconfig.so.1...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libXrender.so.1...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libxcb.so.1...(no debugging symbols found)...done.
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Reading symbols from /lib/libexpat.so.1...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libXau.so.6...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libXdmcp.so.6...(no debugging symbols found)...done.
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Reading symbols from /home/samco/linuxcncfast/lib/python/minigl.so...done.
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Reading symbols from /usr/lib/libGLU.so.1...(no debugging symbols found)...done.
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Reading symbols from /home/samco/linuxcncfast/lib/python/gcode.so...done.
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Reading symbols from /home/samco/linuxcncfast/lib/librs274.so.0...done.
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Reading symbols from /home/samco/linuxcncfast/lib/liblinuxcncini.so.0...done.
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Reading symbols from /home/samco/linuxcncfast/lib/libpyplugin.so.0...done.
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Reading symbols from /home/samco/linuxcncfast/lib/liblinuxcnchal.so.0...done.
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Reading symbols from /usr/lib/libboost_python-py26.so.1.40.0...(no debugging symbols found)...done.
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Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done.
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Reading symbols from /home/samco/linuxcncfast/lib/python/_togl.so...done.
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Reading symbols from /usr/lib/libXmu.so.6...(no debugging symbols found)...done.
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Reading symbols from /lib/libuuid.so.1...(no debugging symbols found)...done.
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Reading symbols from /home/samco/linuxcncfast/lib/python/linuxcnc.so...done.
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Reading symbols from /home/samco/linuxcncfast/lib/libnml.so.0...done.
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Reading symbols from /home/samco/linuxcncfast/lib/python/_hal.so...done.
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Reading symbols from /lib/libnss_compat.so.2...(no debugging symbols found)...done.
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Reading symbols from /lib/libnss_nis.so.2...(no debugging symbols found)...done.
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Reading symbols from /lib/libnss_files.so.2...(no debugging symbols found)...done.
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Reading symbols from /home/samco/linuxcncfast/tcl/linuxcnc.so...done.
Loaded symbols for /home/samco/linuxcncfast/tcl/linuxcnc.so
Reading symbols from /usr/lib/libXcursor.so.1...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/fglrx/dri/fglrx_dri.so...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/fglrx/libatiuki.so.1...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/fglrx/libatiadlxx.so...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/pymodules/python2.6/gtk-2.0/pango.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/pymodules/python2.6/gtk-2.0/pango.so
Reading symbols from /usr/lib/libpango-1.0.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libgobject-2.0.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libgmodule-2.0.so.0...(no debugging symbols found)...done.
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Reading symbols from /lib/libglib-2.0.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/pymodules/python2.6/gtk-2.0/glib/_glib.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/pymodules/python2.6/gtk-2.0/glib/_glib.so
Reading symbols from /usr/lib/libpyglib-2.0-python2.6.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libffi.so.5...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/pymodules/python2.6/gtk-2.0/gobject/_gobject.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/pymodules/python2.6/gtk-2.0/gobject/_gobject.so
Reading symbols from /usr/lib/pymodules/python2.6/cairo/_cairo.so...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libcairo.so.2...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libpixman-1.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libdirectfb-1.2.so.0...(no debugging symbols found)...done.
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Reading symbols from /lib/libpng12.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libxcb-render-util.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/libxcb-render.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libxcb-render.so.0
Reading symbols from /usr/lib/pymodules/python2.6/gtk-2.0/pangocairo.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/pymodules/python2.6/gtk-2.0/pangocairo.so
Reading symbols from /usr/lib/libpangocairo-1.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpangocairo-1.0.so.0
Reading symbols from /usr/lib/libpangoft2-1.0.so.0...(no debugging symbols found)...done.
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Reading symbols from /usr/lib/pango/1.6.0/modules/pango-basic-fc.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/pango/1.6.0/modules/pango-basic-fc.so
Reading symbols from /home/samco/linuxcncfast/lib/python/_tk_seticon.so...done.
Loaded symbols for /home/samco/linuxcncfast/lib/python/_tk_seticon.so
0x00007fc039a1fbc9 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fc02b7c1700 (LWP 1706)]
Logger_start (s=0x21c5260, o=<value optimized out>)
    at emc/usr_intf/axis/extensions/emcmodule.cc:1944
1944	                                oop->x, oop->y, oop->z);
(gdb) bt
#0  Logger_start (s=0x21c5260, o=<value optimized out>)
    at emc/usr_intf/axis/extensions/emcmodule.cc:1944
#1  0x000000000041f0c7 in PyObject_Call ()
#2  0x00000000004a1b03 in PyEval_CallObjectWithKeywords ()
#3  0x00000000004d7d3d in ?? ()
#4  0x00007fc039a1a9ca in start_thread () from /lib/libpthread.so.0
#5  0x00007fc0388f3cdd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()
(gdb) p op
$1 = (logger_point *) 0x7fc02a922ff0
(gdb) p oop
$2 = (logger_point *) 0x7fc02a922fd0
(gdb) p s->npts
$3 = 0
(gdb)