#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:
--------------------------------+-------------------------------------------
Comment(by leif):
Replying to [comment:3 leif]:
> Will retry with FLINT's debugging memory allocator enabled.
Aha, with that, now even doctests fail:
{{{
...
Reallocing from 1 to 2 limbs on heap
Reallocing from 1 to 2 limbs on heap
Reallocing from 1 to 2 limbs on heap
Releasing 2 limbs from heap
Releasing 1 limbs from heap
Releasing 1 limbs from heap
Releasing 1 limbs from heap
Releasing 1 limbs from heap
*** glibc detected *** python: munmap_chunk(): invalid pointer:
0x0000000007b474d8 ***
======= Backtrace: =========
/lib/libc.so.6(+0x775b6)[0x7ff35856b5b6]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_clear+0x3b)[0x7ff34b82cdab]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_berlekamp+0xb6a)[0x7ff34b83360a]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_berlekamp+0xaf4)[0x7ff34b833594]
======= Memory map: ========
...
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libcsage.so(print_backtrace+0x31)[0x7ff3563aa817]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libcsage.so(sigdie+0x14)[0x7ff3563aa849]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libcsage.so(sage_signal_handler+0x1d5)[0x7ff3563aa43b]
/lib/libpthread.so.0(+0xf8f0)[0x7ff358f108f0]
/lib/libc.so.6(gsignal+0x35)[0x7ff358527a75]
/lib/libc.so.6(abort+0x180)[0x7ff35852b5c0]
/lib/libc.so.6(+0x6d4fb)[0x7ff3585614fb]
/lib/libc.so.6(+0x775b6)[0x7ff35856b5b6]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_clear+0x3b)[0x7ff34b82cdab]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_berlekamp+0xb6a)[0x7ff34b83360a]
/tmp/Sage/sage-4.7.2.alpha2/local/lib/libflint.so(zmod_poly_factor_berlekamp+0xaf4)[0x7ff34b833594]
------------------------------------------------------------------------
Unhandled SIGABRT: An abort() 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.
------------------------------------------------------------------------
Aborted
[3.8 s]
----------------------------------------------------------------------
The following tests failed:
sage -t -long -verbose
"devel/sage/sage/libs/flint/zmod_poly_linkage.pxi"
Total time for all tests: 3.8 seconds
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11771#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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