#11771: sage crashes on some degenerate flint xgcd's
--------------------------------+-------------------------------------------
Reporter: lftabera | Owner: AlexGhitza
Type: defect | Status: new
Priority: critical | Milestone: sage-4.7.2
Component: basic arithmetic | Keywords: flint, crash, xgcd fmpq_poly
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by leif):
With non-verbose debugging memory allocator:
{{{
...
Trying:
P = GF(Integer(1009))['x']; (x,) = P._first_ngens(1)###line 621:_sage_
>>> P.<x> = GF(1009)[]
Expecting nothing
ok
Trying:
(prod(P.random_element() for i in range(Integer(5)))).factor()###line
622:_sage_ >>> (prod(P.random_element() for i in range(5))).factor()
Expecting:
(920) * (x + 96) * (x + 288) * (x + 362) * (x + 432) * (x + 603) * (x
+ 709) * (x^2 + x + 585) * (x^2 + 40*x + 888)
*** glibc detected *** python: munmap_chunk(): invalid pointer:
0x00000000072d7de8 ***
======= Backtrace: =========
/lib/libc.so.6(+0x775b6)[0x7f90f075b5b6]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_clear+0x3b)[0x7f90e3a1ccdb]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_berlekamp+0xb6a)[0x7f90e3a2353a]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_berlekamp+0xaf4)[0x7f90e3a234c4]
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11771#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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