#13863: Segfault in pari galoisconj0
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Reporter: vbraun | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-5.6
Component: number theory | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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I found this using electric fence:
{{{
[vbraun@volker-desktop sage-5.6.beta0]$ ef ./sage -gdb
...
sage: K.<a> = NumberField(x^2+1)
sage: K.pari_nf().nfgaloisconj()
Program received signal SIGSEGV, Segmentation fault.
galoisanalysis (T=T@entry=0x7fffa570cf88, ga=ga@entry=0x7fffffffba50,
calcul_l=calcul_l@entry=1)
at ../src/basemath/galconj.c:1305
1305 ../src/basemath/galconj.c: No such file or directory.
Missing separate debuginfos, use: debuginfo-install
atlas-3.8.4-7.fc18.x86_64 expat-2.1.0-4.fc18.x86_64
fontconfig-2.10.2-1.fc18.x86_64 glibc-2.16-28.fc18.x86_64
libgcc-4.7.2-8.fc18.x86_64 libpng-1.5.13-1.fc18.x86_64
libstdc++-4.7.2-8.fc18.x86_64
(gdb) bt
#0 galoisanalysis (T=T@entry=0x7fffa570cf88, ga=ga@entry=0x7fffffffba50,
calcul_l=calcul_l@entry=1)
at ../src/basemath/galconj.c:1305
#1 0x00007fffea0b4353 in galoisconj4_main (T=0x7fffa570cf88,
T@entry=0x7fffa570cfb0,
den=0x7fffea2d2c40 <readonly_constants+32>, flag=0) at
../src/basemath/galconj.c:2212
#2 0x00007fffea0b4f86 in galoisconj (nf=0x7fffa570cfb0, d=<optimized
out>) at ../src/basemath/galconj.c:2312
#3 0x00007fffea0b56c9 in galoisconj0 (nf=<optimized out>,
flag=flag@entry=0, d=<optimized out>,
prec=<optimized out>) at ../src/basemath/galconj.c:2321
#4 0x00007fffe2cc6974 in
__pyx_pf_4sage_4libs_4pari_3gen_3gen_608nfgaloisconj (
__pyx_v_self=__pyx_v_self@entry=0x7fffa73cde68, __pyx_v_flag=0,
__pyx_v_denom=<optimized out>,
__pyx_v_precision=0) at sage/libs/pari/gen.c:38446
#5 0x00007fffe2cc6dd0 in
__pyx_pw_4sage_4libs_4pari_3gen_3gen_609nfgaloisconj
(__pyx_v_self=0x7fffa73cde68,
__pyx_args=<optimized out>, __pyx_kwds=0x0) at
sage/libs/pari/gen.c:38360
#6 0x00007ffff7ae7742 in call_function (oparg=<optimized out>,
pp_stack=0x7fffffffbf80) at Python/ceval.c:4021
#7 PyEval_EvalFrameEx (f=f@entry=0x7fffa55aee30,
throwflag=throwflag@entry=0) at Python/ceval.c:2666
}}}
The relevant piece of the pari code seems to be
{{{
static int
galoisanalysis(GEN T, struct galois_analysis *ga, long calcul_l)
{
...
n = degpol(T);
O = const_vecsmall(n, 0);
...
ga->p4 = O[4]; <--- this is where the segfault occurs
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13863>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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