#5344: [with patch, needs work] Singular/omalloc "double free" problem
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Reporter: GeorgSWeber | Owner: mabshoff
Type: defect | Status: new
Priority: critical | Milestone: sage-3.4.1
Component: packages | Keywords:
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Comment(by GeorgSWeber):
OK, I try tp rephrase it:
There is a hidden Singular related bug "four double frees". Currently it
occurs only for OS X 64Bit and is brought to light by using "--with-
malloc=system", as in the patch attached to #4181. It is also possible to
make it appear by switching to "--with-malloc=external" and then using the
original dlmalloc, as explained above in the original description.
But:
The patch attached to this ticket does *not* touch the build of omalloc
(or the underlying mem allocator) at all! (There is no "--with-malloc
whatsoever" in it).
Instead, the patch to this ticket attempts to fix an issue in the Singular
kernel. From both reading the code and from my tests it is obvious that
the Singular kernel at a certain place screws up its memory management
(see the end of the description above), mixing two different "free()"
implementations.
And I'm unsure what exactly you mean by "switching back and forth from/to
mmap" --- could please be more verbose on that?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5344#comment:5>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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