#14059: Fix refcount/deallocation of integers
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Reporter: SimonKing | Owner: rlm
Type: defect | Status: new
Priority: blocker | Milestone: sage-5.7
Component: memleak | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by jpflori):
Replying to [comment:18 SimonKing]:
> Replying to [comment:17 jpflori]:
> > The problem occurs when deallocating ONE, which is allocated before
the hooks are setup, with the hooked method.
>
> OK. But ONE is not the only integer that gets created before setting the
hook.
I agree it is a problem.
>
> The created integers are:
>
> * 0
> * 1
> * ONE (hence, the integer 1 is created, and then another 1 is created
and assigned to ONE)
> * -1
> * 0
> * 1
> * `global_dummy_Integer` (which is 0)
>
> And them the hooks are established.
>
> > Creating ONE after hooking up the method (seemingly) solves the
problem.
>
> But probably we should take care of the other elements as well.
Yup.
>
> By the way: There is another way to make the segfault vanish. We could
simply insert print statements, that print the memory addresses of the
integers when they are created/deleted/taken from the pool/put into the
pool. It works (but don't take it as a serious suggestion...)!
>
> So, how did you find out that ONE is deallocated with the hooked method?
Looking at the enhanced backtrace.
A dict is deallocated and our tools are smart enough to print the name of
the object in the dict with there address and one step further the
fats_tp_dealloc method is called on the address corresponding to ONE.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14059#comment:22>
Sage <http://www.sagemath.org>
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