#13731: Fix libsingular memory management
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Reporter: nbruin |
Owner: rlm
Type: defect |
Status: new
Priority: major |
Milestone: sage-5.6
Component: memleak |
Resolution:
Keywords: | Work
issues:
Report Upstream: Reported upstream. Developers acknowledge bug. |
Reviewers:
Authors: | Merged
in:
Dependencies: |
Stopgaps:
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Comment (by nbruin):
Replying to [comment:39 SimonKing]:
> I've put the following two files into the `patches/` folder of the
singular-3-1-5.malloc-linux spkg:
[...]
Perhaps backport this instead (should be pretty straightforward to replace
the patches):
[http://www.singular.uni-kl.de:8002/trac/changeset/15435]
It looks like the second issue is also addressed. Are the other issues
within your reach to investigate? I'm not really comfortable tracing
through templated C++.
The FC16 packaged valgrind didn't work for me due to unsupported machine
instructions, but the latest valgrind release fixes that and installing
that in /usr/local was a breeze! I can thoroughly recommend using it. The
information it gives seem spot-on.
(I was able to diagnose both these issues by just looking at the valgrind
report and tracing through the code from allocation to access error. It
won't always be that straightforward, but one can hope)
With
[http://sage.math.washington.edu/home/nbruin/sage.supp]
the amount of false (or at least for me uninteresting) reports is
bearable.
It's unlikely, but the errors we've found could lead to random corruptions
and hence explain the peculiar system-dependent bugs we've experienced.
I'm afraid we're not done yet, though: Although we haven't found a GC
mismatch here, we're pretty sure they exist. Also these corruptions should
cause bad problems all around, not just after introducing GC.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13731#comment:41>
Sage <http://www.sagemath.org>
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