Segfault in normal.lib initialization

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Volker Braun

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Dec 28, 2015, 4:06:50 PM12/28/15
to libsingular-devel
The following is random and I don't have a good testcase, it just happens occasionally on the Sage buildbot that does the SAGE_DEBUG=yes build. I just wanted to post it in case somebody has encountered it before.


$ ./sage -t --long src/sage/libs/singular/function.pyx | c++filt 
too few successful tests, not using stored timings
Running doctests with ID 2015-12-28-21-42-16-0a6e2ece.
Git branch: develop
Using --optional=mpir,python2,sage
Doctesting 1 file.
sage -t --long src/sage/libs/singular/function.pyx
    Killed due to segmentation fault
**********************************************************************
Tests run before process (pid=423) failed:
sage: from sage.libs.singular.function import singular_function ## line 26 ##
sage: P.<a,b,c,d> = PolynomialRing(GF(7)) ## line 27 ##
sage: std = singular_function('std') ## line 28 ##
sage: I = sage.rings.ideal.Cyclic(P) ## line 29 ##
sage: std(I) ## line 30 ##
[a + b + c + d, b^2 + 2*b*d + d^2, b*c^2 + c^2*d - b*d^2 - d^3, b*c*d^2 + c^2*d^2 - b*d^3 + c*d^3 - d^4 - 1, b*d^4 + d^5 - b - d, c^3*d^2 + c^2*d^3 - c - d, c^2*d^4 + b*c - b*d + c*d - 2*d^2]
sage: from sage.libs.singular.function import singular_function, lib as singular_lib ## line 42 ##
sage: primdecSY = singular_function('primdecSY') ## line 43 ##
sage: singular_lib('primdec.lib') ## line 48 ##
sage: primdecSY = singular_function('primdecSY') ## line 49 ##
sage: import sage.libs.singular.function_factory ## line 53 ##
sage: primdecSY = sage.libs.singular.function_factory.ff.primdec__lib.primdecSY ## line 54 ##
sage: from sage.libs.singular.function import singular_function ## line 61 ##
sage: std = singular_function('std') ## line 62 ##
sage: loads(dumps(std)) == std ## line 63 ##
True
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 65 ##
0
sage: from sage.libs.singular.function import singular_function ## line 143 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 144 ##
sage: ringlist = singular_function("ringlist") ## line 145 ##
sage: l = ringlist(P) ## line 146 ##
sage: ring = singular_function("ring") ## line 147 ##
sage: ring(l, ring=P) ## line 148 ##
<RingWrap>
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 150 ##
0
sage: from sage.libs.singular.function import singular_function ## line 165 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 166 ##
sage: ringlist = singular_function("ringlist") ## line 167 ##
sage: l = ringlist(P) ## line 168 ##
sage: ring = singular_function("ring") ## line 169 ##
sage: ring(l, ring=P).ngens() ## line 170 ##
3
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 172 ##
0
sage: from sage.libs.singular.function import singular_function ## line 181 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 182 ##
sage: ringlist = singular_function("ringlist") ## line 183 ##
sage: l = ringlist(P) ## line 184 ##
sage: ring = singular_function("ring") ## line 185 ##
sage: ring(l, ring=P).var_names() ## line 186 ##
['x', 'y', 'z']
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 188 ##
0
sage: from sage.libs.singular.function import singular_function ## line 197 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 198 ##
sage: ringlist = singular_function("ringlist") ## line 199 ##
sage: l = ringlist(P) ## line 200 ##
sage: ring = singular_function("ring") ## line 201 ##
sage: ring(l, ring=P).npars() ## line 202 ##
0
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 204 ##
0
sage: from sage.libs.singular.function import singular_function ## line 213 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 214 ##
sage: ringlist = singular_function("ringlist") ## line 215 ##
sage: l = ringlist(P) ## line 216 ##
sage: ring = singular_function("ring") ## line 217 ##
sage: ring(l, ring=P).ordering_string() ## line 218 ##
'dp(3),C'
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 220 ##
0
sage: from sage.libs.singular.function import singular_function ## line 231 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 232 ##
sage: ringlist = singular_function("ringlist") ## line 233 ##
sage: l = ringlist(P) ## line 234 ##
sage: ring = singular_function("ring") ## line 235 ##
sage: ring(l, ring=P).par_names() ## line 236 ##
[]
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 238 ##
0
sage: from sage.libs.singular.function import singular_function ## line 247 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 248 ##
sage: ringlist = singular_function("ringlist") ## line 249 ##
sage: l = ringlist(P) ## line 250 ##
sage: ring = singular_function("ring") ## line 251 ##
sage: ring(l, ring=P).characteristic() ## line 252 ##
0
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 254 ##
0
sage: from sage.libs.singular.function import singular_function ## line 263 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 264 ##
sage: ringlist = singular_function("ringlist") ## line 265 ##
sage: l = ringlist(P) ## line 266 ##
sage: ring = singular_function("ring") ## line 267 ##
sage: ring(l, ring=P).is_commutative() ## line 268 ##
True
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 270 ##
0
sage: from sage.libs.singular.function import singular_function ## line 279 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 280 ##
sage: ringlist = singular_function("ringlist") ## line 281 ##
sage: l = ringlist(P) ## line 282 ##
sage: ring = singular_function("ring") ## line 283 ##
sage: ring(l, ring=P)._output() ## line 284 ##
//   characteristic : 0
//   number of vars : 3
//        block   1 : ordering dp
//                  : names    x y z
//        block   2 : ordering Csage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 290 ##
0
sage: from sage.libs.singular.function import singular_function ## line 301 ##
sage: mres = singular_function("mres") ## line 302 ##
sage: syz = singular_function("syz") ## line 303 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 304 ##
sage: I = P.ideal([x+y,x*y-y, y*2,x**2+1]) ## line 305 ##
sage: M = syz(I) ## line 306 ##
sage: resolution = mres(M, 0) ## line 307 ##
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 308 ##
0
sage: from sage.libs.singular.function import singular_function ## line 316 ##
sage: mres = singular_function("mres") ## line 317 ##
sage: syz = singular_function("syz") ## line 318 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 319 ##
sage: I = P.ideal([x+y,x*y-y, y*2,x**2+1]) ## line 320 ##
sage: M = syz(I) ## line 321 ##
sage: resolution = mres(M, 0) ## line 322 ##
sage: resolution ## line 323 ##
<Resolution>
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 325 ##
0
sage: from sage.libs.singular.function import singular_function ## line 331 ##
sage: mres = singular_function("mres") ## line 332 ##
sage: syz = singular_function("syz") ## line 333 ##
sage: P.<x,y,z> = PolynomialRing(QQ) ## line 334 ##
sage: I = P.ideal([x+y,x*y-y, y*2,x**2+1]) ## line 335 ##
sage: M = syz(I) ## line 336 ##
sage: resolution = mres(M, 0) ## line 337 ##
sage: del resolution ## line 338 ##
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 339 ##
0
sage: from sage.libs.singular.function import is_sage_wrapper_for_singular_ring ## line 378 ##
sage: P.<x,y,z> = QQ[] ## line 379 ##
sage: is_sage_wrapper_for_singular_ring(P) ## line 380 ##
True
sage: A.<x,y,z> = FreeAlgebra(QQ, 3) ## line 385 ##
sage: P = A.g_algebra(relations={y*x:-x*y}, order = 'lex') ## line 386 ##
sage: is_sage_wrapper_for_singular_ring(P) ## line 387 ##
True
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 390 ##
0
sage: from sage.libs.singular.function import is_singular_poly_wrapper ## line 411 ##
sage: A.<x,y,z> = FreeAlgebra(QQ, 3) ## line 412 ##
sage: H.<x,y,z> = A.g_algebra({z*x:x*z+2*x, z*y:y*z-2*y}) ## line 413 ##
sage: is_singular_poly_wrapper(x+y) ## line 414 ##
True
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 417 ##
0
sage: from sage.libs.singular.function import all_singular_poly_wrapper ## line 427 ##
sage: P.<x,y,z> = QQ[] ## line 428 ##
sage: all_singular_poly_wrapper([x+1, y]) ## line 429 ##
True
sage: all_singular_poly_wrapper([x+1, y, 1]) ## line 431 ##
False
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 433 ##
0
sage: from sage.libs.singular.function import all_vectors ## line 470 ##
sage: P.<x,y,z> = QQ[] ## line 471 ##
sage: M = P**2 ## line 472 ##
sage: all_vectors([x]) ## line 473 ##
False
sage: all_vectors([(x,y)]) ## line 475 ##
False
sage: all_vectors([M(0), M((x,y))]) ## line 477 ##
True
sage: all_vectors([M(0), M((x,y)),(0,0)]) ## line 479 ##
False
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 481 ##
0
sage: from sage.libs.singular.function import Converter ## line 508 ##
sage: P.<a,b,c> = PolynomialRing(GF(127)) ## line 509 ##
sage: Converter([a,b,c],ring=P) ## line 510 ##
Singular Converter in Multivariate Polynomial Ring in a, b, c over Finite Field of size 127
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 512 ##
0
sage: from sage.libs.singular.function import Converter ## line 607 ##
sage: P.<a,b,c> = PolynomialRing(GF(127)) ## line 608 ##
sage: Converter([a,b,c],ring=P).ring() ## line 609 ##
Multivariate Polynomial Ring in a, b, c over Finite Field of size 127
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 611 ##
0
sage: from sage.libs.singular.function import Converter ## line 618 ##
sage: P.<a,b,c> = PolynomialRing(GF(127)) ## line 619 ##
sage: Converter([a,b,c],ring=P) # indirect doctest ## line 620 ##
Singular Converter in Multivariate Polynomial Ring in a, b, c over Finite Field of size 127
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 622 ##
0
sage: from sage.libs.singular.function import Converter ## line 634 ##
sage: P.<a,b,c> = PolynomialRing(GF(127)) ## line 635 ##
sage: len(Converter([a,b,c],ring=P)) ## line 636 ##
3
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 638 ##
0
sage: P.<x,y,z> = QQ[] ## line 938 ##
sage: C= Curve((x-y)*(y-z)*(z-x));  ## line 939 ##
sage: import sage.libs.singular.function_factory ## line 940 ##
sage: sing_genus = sage.libs.singular.function_factory.ff.normal__lib.genus ## line 941 ##
// ** s_internalDelete: cannot delete type $INVALID$(-606348325)
------------------------------------------------------------------------
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python(main+0x20)[0x400846]
/lib64/libc.so.6(__libc_start_main+0xf0)[0x7f5f7a49a580]
python(_start+0x29)[0x400759]


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