GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
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Reading symbols from /usr/local/bin/inkscape...done.
(gdb) run
Starting program: /usr/local/bin/inkscape 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffde846700 (LWP 12437)]
[New Thread 0x7fffdd7c1700 (LWP 12438)]

Program received signal SIGSEGV, Segmentation fault.
SPObject::requestDisplayUpdate (this=0x5005f0, flags=330) at sp-object.cpp:1112
1112	    this->uflags |= flags;
(gdb) bt
#0  SPObject::requestDisplayUpdate (this=0x5005f0, flags=330) at sp-object.cpp:1112
#1  0x00000000004ffe40 in PatternKnotHolderEntityXY::knot_set (this=this@entry=0x84bc210, p=..., origin=..., state=272)
    at knot-holder-entity.cpp:179
#2  0x00000000004fe5a0 in KnotHolder::knot_moved_handler (this=0x32e6620, knot=<optimized out>, p=..., 
    state=<optimized out>) at knotholder.cpp:175
#3  0x00000000004fcee7 in emit (_A_a3=@0x7fffffffd36c: 272, _A_a2=..., _A_a1=@0x7fffffffd378: 0x85104d0, 
    impl=0x892e800) at /usr/include/sigc++-2.0/sigc++/signal.h:1501
#4  emit (_A_a3=@0x7fffffffd36c: 272, _A_a2=..., _A_a1=@0x7fffffffd378: 0x85104d0, this=<optimized out>)
    at /usr/include/sigc++-2.0/sigc++/signal.h:3003
#5  SPKnot::setPosition (this=this@entry=0x85104d0, p=..., state=272) at knot.cpp:391
#6  0x00000000004fd150 in SPKnot::requestPosition (this=this@entry=0x85104d0, p=..., state=272) at knot.cpp:380
#7  0x00000000004fd280 in sp_knot_handler_request_position (event=0x7629dc0, knot=0x85104d0) at knot.cpp:358
#8  0x00000000004fdac1 in sp_knot_handler (event=0x7629dc0, knot=0x85104d0) at knot.cpp:286
#9  0x0000000000706a11 in sp_marshal_BOOLEAN__POINTER (closure=0x8510650, return_value=0x7fffffffd840, 
    n_param_values=<optimized out>, param_values=0x7fffffffd770, invocation_hint=<optimized out>, 
    marshal_data=<optimized out>) at helper/sp-marshal.cpp:124
#10 0x00007ffff02dd6e0 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007ffff02ee750 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007ffff02f62db in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007ffff02f6852 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x000000000064d01f in emitEvent (event=<optimized out>, canvas=<optimized out>) at display/sp-canvas.cpp:1599
#15 SPCanvasImpl::emitEvent (canvas=<optimized out>, event=<optimized out>) at display/sp-canvas.cpp:1486
#16 0x000000000064d4a6 in SPCanvasImpl::handleMotion (widget=0x3289000, event=0x7630310) at display/sp-canvas.cpp:1842
#17 0x00007ffff6b8f099 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#18 0x00007ffff02dd6e0 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#19 0x00007ffff02ee4d0 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#20 0x00007ffff02f62db in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007ffff02f6852 in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#22 0x00007ffff6ca693e in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#23 0x00007ffff6b8d434 in gtk_propagate_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#24 0x00007ffff6b8d78b in gtk_main_do_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#25 0x00007ffff67fa7ac in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#26 0x00007fffefd25355 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007fffefd25688 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007fffefd25a82 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007ffff6b8c797 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#30 0x000000000047b04b in sp_main_gui (argc=1, argv=0x7fffffffe498) at main.cpp:1075
#31 0x00007fffeefb3ead in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#32 0x0000000000477dc1 in _start ()
(gdb) q