#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):
Replying to [comment:15 leif]:
> It seems the memory allocated for `temp` is insufficient [...]
> Which would mean the bug is in `fmpq_poly`, not FLINT.
Yep, increasing `limbs` by five the example runs without errors, though I
get:
{{{
...
==6537== HEAP SUMMARY:
==6537== in use at exit: 160,209 bytes in 7 blocks
==6537== total heap usage: 143,815 allocs, 143,808 frees, 261,851,498
bytes allocated
==6537==
==6537== LEAK SUMMARY:
==6537== definitely lost: 72,129 bytes in 3 blocks
==6537== indirectly lost: 0 bytes in 0 blocks
==6537== possibly lost: 80,000 bytes in 1 blocks
==6537== still reachable: 8,080 bytes in 3 blocks
==6537== suppressed: 0 bytes in 0 blocks
==6537== Rerun with --leak-check=full to see details of leaked memory
==6537==
==6537== For counts of detected and suppressed errors, rerun with: -v
==6537== Use --track-origins=yes to see where uninitialised values come
from
==6537== ERROR SUMMARY: 6 errors from 2 contexts (suppressed: 2 from 2)
}}}
I don't know what the correct size for `temp` should be in general though;
perhaps you (Luis) know better, or Sebastian can fix this.
At least it's good to know that the memory corruption doesn't happen
elsewhere in Sage, and also isn't caused by (upstream) FLINT.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11771#comment:16>
Sage <http://www.sagemath.org>
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