#12173: Update FLINT to 2.3
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Reporter: mhansen | Owner: tbd
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.1
Component: packages | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: #12433 | Stopgaps:
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Comment (by fredrik.johansson):
The first Invalid read of size 8 is likely not a bug. On various
platforms, mpn_copyi relies on page boundaries being aligned to a multiple
of 16 bytes so that it can safely read an extra 8 bytes, IIRC. (This pops
up all over the place when valgrinding flint unit tests, and it's
convenient to add it to the valgrind suppression file.)
The second one has to be what it looks like: some polynomial lives until
after _fmpz_cleanup has been called.
So the question is how we can guarantee that all Python objects
referencing flint objects get deallocated before _fmpz_cleanup is called.
If this is impossible, I guess we could compile flint in reentrant mode
for Sage (but this would slow things down, unfortunately).
One possibility is that we change _fmpz_cleanup to free all mpz limb data
but leave the mpz array. This might still be a bit fragile, but if it
works, it should solve the problem of polluting valgrind logs since there
will only be one large block of unfreed memory.
We must also have this problem with flint_compute_primes.
Does Sage free the MPFR caches on exit, and if so where?
Perhaps this should be brought to sage-devel.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12173#comment:48>
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