#13744: Bug in modular_decomposition
---------------------------------+------------------------------------------
Reporter: ncohen | Owner: jason, ncohen, rlm
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.6
Component: graph theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Robert Bradshaw
Authors: Nathann Cohen | Merged in:
Dependencies: | Stopgaps:
---------------------------------+------------------------------------------
Changes (by jdemeyer):
* status: positive_review => needs_work
Comment:
On sage.math (64-bit Linux x86_64):
{{{
sage -t -force_lib
devel/sage/sage/graphs/modular_decomposition/modular_decomposition.pyx
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libcsage.so(print_backtrace+0x31)[0x2ba5db141207]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libcsage.so(sigdie+0x14)[0x2ba5db141239]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libcsage.so(sage_signal_handler+0x216)[0x2ba5db140e16]
/lib/libpthread.so.0[0x2ba5d90657d0]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/python
/site-
packages/sage/graphs/modular_decomposition/modular_decomposition.so(algo2+0x459)[0x2ba607191f09]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/python
/site-
packages/sage/graphs/modular_decomposition/modular_decomposition.so(decomposition_modulaire+0x67)[0x2ba607192e97]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/python
/site-
packages/sage/graphs/modular_decomposition/modular_decomposition.so[0x2ba6071943e9]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5ed8)[0x2ba5d8d5be98]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCode+0x32)[0x2ba5d8d5d0f2]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x515f)[0x2ba5d8d5b11f]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0[0x2ba5d8cdf9bc]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyObject_Call+0x53)[0x2ba5d8cb7bc3]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0[0x2ba5d8cc530f]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyObject_Call+0x53)[0x2ba5d8cb7bc3]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x3fcd)[0x2ba5d8d59f8d]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5420)[0x2ba5d8d5b3e0]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0[0x2ba5d8cdf9bc]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyObject_Call+0x53)[0x2ba5d8cb7bc3]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0[0x2ba5d8cc530f]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyObject_Call+0x53)[0x2ba5d8cb7bc3]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x3fcd)[0x2ba5d8d59f8d]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5420)[0x2ba5d8d5b3e0]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0[0x2ba5d8cdfab3]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyObject_Call+0x53)[0x2ba5d8cb7bc3]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0[0x2ba5d8cc530f]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyObject_Call+0x53)[0x2ba5d8cb7bc3]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x3fcd)[0x2ba5d8d59f8d]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5420)[0x2ba5d8d5b3e0]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5420)[0x2ba5d8d5b3e0]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5420)[0x2ba5d8d5b3e0]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x855)[0x2ba5d8d5cfb5]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyEval_EvalCode+0x32)[0x2ba5d8d5d0f2]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyRun_FileExFlags+0xb0)[0x2ba5d8d7f790]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(PyRun_SimpleFileExFlags+0xdf)[0x2ba5d8d8022f]
/release/buildbot/sage/sage-1/sage_binary/build/sage-5.6.beta1/local/lib/libpython2.7.so.1.0(Py_Main+0xbe5)[0x2ba5d8d93845]
/lib/libc.so.6(__libc_start_main+0xf4)[0x2ba5d991a1f4]
python[0x400619]
------------------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault occurred in Sage.
This probably occurred because a *compiled* component of Sage has a bug
in it and is not properly wrapped with sig_on(), sig_off(). You might
want to run Sage under gdb with 'sage -gdb' to debug this.
Sage will now terminate.
------------------------------------------------------------------------
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13744#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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