#13133: BooleanMonomial.index() SEGFAULT on constant monomials
-----------------------------------+----------------------------------------
Reporter: Bouillaguet | Owner: malb
Type: defect | Status: new
Priority: minor | Milestone: sage-5.1
Component: commutative algebra | Keywords:
Work issues: | Report Upstream: Not yet reported
upstream; Will do shortly.
Reviewers: | Authors: Charles Bouillaguet
Merged in: | Dependencies: polybori
Stopgaps: |
-----------------------------------+----------------------------------------
{{{
sage: R.<x,y> = BooleanPolynomialRing()
sage: R(1).lm().index()
}}}
crashes miserably (from inside polybori, as I understand) with:
{{{
/usr/local/sage/local/lib/libcsage.so(print_backtrace+0x3b)[0x1cd9d3]
/usr/local/sage/local/lib/libcsage.so(sigdie+0x17)[0x1cda13]
/usr/local/sage/local/lib/libcsage.so(sage_signal_handler+0x20d)[0x1cd598]
[0xc27400]
/usr/local/sage/local/lib/python2.6/site-
packages/sage/rings/polynomial/pbori.so(+0x13d90)[0x5235d90]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x482e)[0x2a55ee]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCodeEx+0x7d1)[0x2a6fa1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCode+0x63)[0x2a70c3]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x50c9)[0x2a5e89]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCodeEx+0x7d1)[0x2a6fa1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x4370)[0x2a5130]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCodeEx+0x7d1)[0x2a6fa1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x4370)[0x2a5130]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x59e1)[0x2a67a1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCodeEx+0x7d1)[0x2a6fa1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x4370)[0x2a5130]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCodeEx+0x7d1)[0x2a6fa1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x4370)[0x2a5130]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCodeEx+0x7d1)[0x2a6fa1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x4370)[0x2a5130]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCodeEx+0x7d1)[0x2a6fa1]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyEval_EvalCode+0x63)[0x2a70c3]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyRun_FileExFlags+0xb1)[0x2c6f91]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyRun_SimpleFileExFlags+0xdc)[0x2c71cc]
/usr/local/sage/local/lib/libpython2.6.so.1.0(PyRun_AnyFileExFlags+0x7a)[0x2c75fa]
/usr/local/sage/local/lib/libpython2.6.so.1.0(Py_Main+0xc7d)[0x2d3c4d]
python(main+0x27)[0x8048657]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x405113]
------------------------------------------------------------------------
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.
------------------------------------------------------------------------
}}}
This seems to be a bug in PolyBori. The patch I propose just checks that
the monomial is not constant before calling the polybori function. This is
a workaround though
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13133>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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