[SciPy-Dev] segfault in test_qhull.TestRidgeIter2D.test_complicated

Sun Nov 14 18:02:56 EST 2010

Hi,
I'm getting a segfault when running scipy.test()...

scipy: trunk at 6894
numpy: git tip (a07ac0f ENH: Add '-' to separate git hash in version.)
python: 3.1 (Python 3.1.2 (release31-maint, Sep 26 2010, 16:45:30) [GCC 4.4.5] on linux2)
       or 3.2 (from current hg)

The backtrace is pretty impressive :)

> import scipy; scipy.test(verbose=10)
...
test_qhull.TestRidgeIter2D.test_complicated ... 
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff2912f5c in qh_setappend (setp=0x48f4f88, newelem=0x48f4e80) at scipy/spatial/qhull/src/qset.c:138
138       *(endp= &((*setp)->e[(*sizep)++ - 1].p))= newelem;

(gdb) bt
#0  0x00007ffff2912f5c in qh_setappend (setp=0x48f4f88, newelem=0x48f4e80) at scipy/spatial/qhull/src/qset.c:138
#1  0x00007ffff290b21f in qh_vertexneighbors () at scipy/spatial/qhull/src/poly2.c:3105
#2  0x00007ffff2932245 in qh_mergefacet (facet1=0x48f4d68, facet2=0x48f5060, mindist=0x0, maxdist=0x0, mergeapex=1) at scipy/spatial/qhull/src/merge.c:2325
#3  0x00007ffff2932678 in qh_mergecycle_all (facetlist=<value optimized out>, wasmerge=0x7fffffff73ac) at scipy/spatial/qhull/src/merge.c:1856
#4  0x00007ffff2933bd0 in qh_premerge (apex=<value optimized out>, maxcentrum=<value optimized out>, maxangle=<value optimized out>) at scipy/spatial/qhull/src/merge.c:70
#5  0x00007ffff291a005 in qh_addpoint (furthest=0x463b668, facet=0x48f5128, checkdist=<value optimized out>) at scipy/spatial/qhull/src/qhull.c:235
#6  0x00007ffff291a3d3 in qh_buildhull () at scipy/spatial/qhull/src/qhull.c:394
#7  0x00007ffff291a9ad in qh_qhull () at scipy/spatial/qhull/src/qhull.c:66
#8  0x00007ffff2913d75 in qh_new_qhull (dim=<value optimized out>, numpoints=<value optimized out>, points=<value optimized out>, ismalloc=<value optimized out>, qhull_cmd=<value optimized out>, 
    outfile=<value optimized out>, errfile=0x7ffff6aff860) at scipy/spatial/qhull/src/user.c:156
#9  0x00007ffff28eec10 in __pyx_pf_5scipy_7spatial_5qhull__construct_delaunay (__pyx_self=<value optimized out>, __pyx_v_points=<value optimized out>) at scipy/spatial/qhull.c:1249
#10 0x0000000000528a97 in PyObject_Call (func=<built-in method _construct_delaunay of module object at remote 0x1d6da28>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#11 0x00007ffff28ecc9b in __pyx_pf_5scipy_7spatial_5qhull_8Delaunay___init__ (__pyx_self=<value optimized out>, __pyx_args=<value optimized out>, __pyx_kwds=<value optimized out>)
    at scipy/spatial/qhull.c:4067
#12 0x0000000000528a97 in PyObject_Call (func=<built-in function __init__>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#13 0x000000000053fbbc in method_call (func=<built-in function __init__>, arg=(<numpy.ndarray at remote 0x48c4970>,), kw=0x0) at ../Objects/classobject.c:319
#14 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x43f9830>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#15 0x00000000004353d8 in slot_tp_init (self=<Delaunay at remote 0x45aa290>, args=(<numpy.ndarray at remote 0x48c4970>,), kwds=0x0) at ../Objects/typeobject.c:5206
#16 0x0000000000429e1f in type_call (type=0x1dba640, args=(<numpy.ndarray at remote 0x48c4970>,), kwds=0x0) at ../Objects/typeobject.c:679
#17 0x0000000000528a97 in PyObject_Call (func=<type at remote 0x1dba640>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#18 0x0000000000465a5e in do_call (f=
    Frame 0x48e6610, for file <__main__.PyUnicodeObjectPtr object at 0x7f1062ae6d10>, line 118, in <__main__.PyUnicodeObjectPtr object at 0x7f1062ae6cd0> (self=<TestRidgeIter2D at remote 0x4429390>, points=<numpy.ndarray at remote 0x48c4970>), throwflag=<value optimized out>) at ../Python/ceval.c:3982
#19 call_function (f=
    Frame 0x48e6610, for file <__main__.PyUnicodeObjectPtr object at 0x7f1062ae6c50>, line 118, in <__main__.PyUnicodeObjectPtr object at 0x7f1062ae6cd0> (self=<TestRidgeIter2D at remote 0x4429390>, points=<numpy.ndarray at remote 0x48c4970>), throwflag=<value optimized out>) at ../Python/ceval.c:3785
#20 PyEval_EvalFrameEx (f=
    Frame 0x48e6610, for file <__main__.PyUnicodeObjectPtr object at 0x7f1062ae6d10>, line 118, in <__main__.PyUnicodeObjectPtr object at 0x7f1062ae6cd0> (self=<TestRidgeIter2D at remote 0x4429390>, points=<numpy.ndarray at remote 0x48c4970>), throwflag=<value optimized out>) at ../Python/ceval.c:2548
#21 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x42310b0, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#22 0x00000000005528b4 in function_call (func=<function at remote 0x422b2f8>, arg=(<TestRidgeIter2D at remote 0x4429390>,), kw=0x0) at ../Objects/funcobject.c:630
#23 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x422b2f8>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#24 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#25 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#26 0x0000000000465b2f in fast_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3850
#27 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3783
#28 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#29 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0xf372b0, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0xfbd5a8, 
    defcount=1, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#30 0x00000000005528b4 in function_call (func=<function at remote 0xfc5958>, arg=, kw={}) at ../Objects/funcobject.c:630
#31 0x0000000000528a97 in PyObject_Call (func=<function at remote 0xfc5958>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#32 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#33 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#34 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0xf37530, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#35 0x00000000005528b4 in function_call (func=<function at remote 0xfc5a68>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#36 0x0000000000528a97 in PyObject_Call (func=<function at remote 0xfc5a68>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#37 0x000000000053fbbc in method_call (func=<function at remote 0xfc5a68>, arg=, kw=0x0) at ../Objects/classobject.c:319
#38 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x43f91b8>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#39 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#40 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#41 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#42 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#43 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#44 0x0000000000465b2f in fast_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3850
#45 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3783
#46 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#47 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x18ebab0, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#48 0x00000000005528b4 in function_call (func=<function at remote 0x18ffc00>, arg=, kw={}) at ../Objects/funcobject.c:630
#49 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x18ffc00>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#50 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#51 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#52 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1898830, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#53 0x00000000005528b4 in function_call (func=<function at remote 0x18ff738>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#54 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x18ff738>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#55 0x000000000053fbbc in method_call (func=<function at remote 0x18ff738>, arg=, kw=0x0) at ../Objects/classobject.c:319
#56 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x4123f80>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#57 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#58 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#59 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#60 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#61 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#62 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908c30, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#63 0x00000000005528b4 in function_call (func=<function at remote 0x190aaf0>, arg=, kw={}) at ../Objects/funcobject.c:630
#64 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190aaf0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#65 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#66 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#67 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908b30, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#68 0x00000000005528b4 in function_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#69 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190a9e0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#70 0x000000000053fbbc in method_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/classobject.c:319
#71 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x44f85a8>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#72 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#73 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#74 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#75 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#76 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#77 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908c30, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#78 0x00000000005528b4 in function_call (func=<function at remote 0x190aaf0>, arg=, kw={}) at ../Objects/funcobject.c:630
#79 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190aaf0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#80 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#81 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#82 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908b30, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#83 0x00000000005528b4 in function_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#84 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190a9e0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#85 0x000000000053fbbc in method_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/classobject.c:319
#86 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x4c96bd8>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#87 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#88 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#89 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#90 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#91 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#92 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908c30, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#93 0x00000000005528b4 in function_call (func=<function at remote 0x190aaf0>, arg=, kw={}) at ../Objects/funcobject.c:630
#94 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190aaf0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#95 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#96 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#97 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908b30, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#98 0x00000000005528b4 in function_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#99 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190a9e0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#100 0x000000000053fbbc in method_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/classobject.c:319
#101 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x2ddcc20>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#102 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#103 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#104 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#105 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#106 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#107 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908c30, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#108 0x00000000005528b4 in function_call (func=<function at remote 0x190aaf0>, arg=, kw={}) at ../Objects/funcobject.c:630
#109 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190aaf0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#110 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#111 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#112 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908b30, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#113 0x00000000005528b4 in function_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#114 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190a9e0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#115 0x000000000053fbbc in method_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/classobject.c:319
#116 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x2ddcb00>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#117 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#118 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#119 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#120 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#121 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#122 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908c30, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#123 0x00000000005528b4 in function_call (func=<function at remote 0x190aaf0>, arg=, kw={}) at ../Objects/funcobject.c:630
#124 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190aaf0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#125 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#126 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#127 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908b30, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#128 0x00000000005528b4 in function_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#129 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190a9e0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#130 0x000000000053fbbc in method_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/classobject.c:319
#131 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x27585a8>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#132 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#133 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#134 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#135 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#136 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#137 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908c30, globals=<value optimized out>, locals=<value optimized out>, args=0x2, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#138 0x00000000005528b4 in function_call (func=<function at remote 0x190aaf0>, arg=, kw={}) at ../Objects/funcobject.c:630
#139 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190aaf0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#140 0x000000000046427e in ext_do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:4077
#141 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2589
#142 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1908b30, globals=<value optimized out>, locals=<value optimized out>, args=0x1, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#143 0x00000000005528b4 in function_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/funcobject.c:630
#144 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x190a9e0>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#145 0x000000000053fbbc in method_call (func=<function at remote 0x190a9e0>, arg=, kw=0x0) at ../Objects/classobject.c:319
#146 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x29d8e60>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#147 0x0000000000434028 in slot_tp_call (self=, args=, kwds=0x0) at ../Objects/typeobject.c:4946
#148 0x0000000000528a97 in PyObject_Call (func=, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#149 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#150 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#151 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#152 0x0000000000465b2f in fast_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3850
#153 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3783
#154 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#155 0x0000000000465b2f in fast_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3850
#156 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3783
#157 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#158 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0xf52830, globals=<value optimized out>, locals=<value optimized out>, args=0x7, argcount=1, kws=<value optimized out>, kwcount=5, defs=0xf44f70, 
    defcount=6, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#159 0x0000000000465972 in fast_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3860
#160 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3783
#161 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#162 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x1553730, globals=<value optimized out>, locals=<value optimized out>, args=0xb, argcount=1, kws=<value optimized out>, kwcount=3, defs=0x196c8e8, 
    defcount=10, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#163 0x00000000005528b4 in function_call (func=<function at remote 0x196c848>, arg=, kw=) at ../Objects/funcobject.c:630
#164 0x0000000000528a97 in PyObject_Call (func=<function at remote 0x196c848>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#165 0x000000000053fbbc in method_call (func=<function at remote 0x196c848>, arg=(), kw=) at ../Objects/classobject.c:319
#166 0x0000000000528a97 in PyObject_Call (func=<method at remote 0x1a65ab8>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#167 0x00000000004353d8 in slot_tp_init (self=, args=(), kwds=) at ../Objects/typeobject.c:5206
#168 0x0000000000429e1f in type_call (type=0x1b5e650, args=(), kwds=) at ../Objects/typeobject.c:679
#169 0x0000000000528a97 in PyObject_Call (func=<type at remote 0x1b5e650>, arg=<unknown at remote 0x48f4e80>, kw=) at ../Objects/abstract.c:2160
#170 0x0000000000465a5e in do_call (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3982
#171 call_function (f=, throwflag=<value optimized out>) at ../Python/ceval.c:3785
#172 PyEval_EvalFrameEx (f=, throwflag=<value optimized out>) at ../Python/ceval.c:2548
#173 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x100a130, globals=<value optimized out>, locals=<value optimized out>, args=0x6, argcount=1, kws=<value optimized out>, kwcount=1, defs=0xfc4ae8, 
    defcount=5, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#174 0x0000000000465972 in fast_function (f=Frame 0xa9af30, for file <__main__.PyUnicodeObjectPtr object at 0x7f106037cb90>, line 1, in <__main__.PyUnicodeObjectPtr object at 0x7f106037cb10> (), 
    throwflag=<value optimized out>) at ../Python/ceval.c:3860
#175 call_function (f=Frame 0xa9af30, for file <__main__.PyUnicodeObjectPtr object at 0x7f106037c910>, line 1, in <__main__.PyUnicodeObjectPtr object at 0x7f106037cb10> (), 
    throwflag=<value optimized out>) at ../Python/ceval.c:3783
#176 PyEval_EvalFrameEx (f=Frame 0xa9af30, for file <__main__.PyUnicodeObjectPtr object at 0x7f106037cb90>, line 1, in <__main__.PyUnicodeObjectPtr object at 0x7f106037cb10> (), 
    throwflag=<value optimized out>) at ../Python/ceval.c:2548
#177 0x0000000000466ac5 in PyEval_EvalCodeEx (co=0x9e39b0, globals=<value optimized out>, locals=<value optimized out>, args=0x0, argcount=1, kws=<value optimized out>, kwcount=0, defs=0x0, 
    defcount=0, kwdefs=0x0, closure=0x0) at ../Python/ceval.c:3198
#178 0x0000000000466bcb in PyEval_EvalCode (co=0x48f4f88, globals=<unknown at remote 0x48f4e80>, locals=) at ../Python/ceval.c:668
#179 0x0000000000489a20 in run_mod (command=<value optimized out>, flags=<value optimized out>) at ../Python/pythonrun.c:1708
#180 PyRun_StringFlags (command=<value optimized out>, flags=<value optimized out>) at ../Python/pythonrun.c:1642
#181 PyRun_SimpleStringFlags (command=<value optimized out>, flags=<value optimized out>) at ../Python/pythonrun.c:1214
#182 0x000000000049dfa9 in Py_Main (argc=<value optimized out>, argv=<value optimized out>) at ../Modules/main.c:528
#183 0x000000000041d0ae in main (argc=<value optimized out>, argv=<value optimized out>) at ../Modules/python.c:152

(gdb) p **setp
$2 = {maxsize = 0, e = {{p = 0x48f51f0, i = 76501488}}}

The qset code is pretty opaque. I'm posting this here in hope that
somebody who understands the qset code can point me in the right
direction.

Thanks,
Zbyszek