Note that this patch is at this moment not integrated in 3.7.0 SVN.
It still has to be examined/reviewed/.... and then if deemed
appropriate, be integrated.
So, there is no guarantee that it will be in 3.7.0.
Philippe
________________________________
From: Yeshurun, Meir [mailto:[email protected]]
Sent: Friday 14 October 2011 16:18
To: WAROQUIERS Philippe; [email protected]
Subject: RE: [Valgrind-users] --free-list-vol limit
Thanks. Sounds like a nice way to allow a bigger free list
volume and it would have helped in my case. I'll just wait for the 3.7
release since I already fixed this bug. But I would still love to see
Valgrind get rid of the 32G limit.
Thanks,
Meir
________________________________
From: WAROQUIERS Philippe
[mailto:[email protected]]
Sent: Friday, October 14, 2011 4:00 PM
To: Yeshurun, Meir; [email protected]
Subject: RE: [Valgrind-users] --free-list-vol limit
I think it is not possible (or at least without significant
work) to overcome the 32Gb limit.
An alternative solution might be:
if you have a mixture of big allocations and small
allocations in your application,
and your double free is of a "small" size,
then you could take a 3.7.0 from SVN (see
http://www.valgrind.org/downloads/repository.html )
and apply the patch in bugzilla
http://bugs.kde.org/show_bug.cgi?id=250065
With this patch, you have a new option
--freelist-big-blocks=....
which allows to specify the size above which
the blocks are "released" from the free list in priority.
With this, you might "prune" parts of the big alloc/free from
the free list, allowing you
to find the double free of your "small" block.
Philippe
________________________________
From: Yeshurun, Meir [mailto:[email protected]]
Sent: Friday 14 October 2011 15:31
To: [email protected]
Subject: [Valgrind-users] --free-list-vol limit
Hi,
I recently had to debug a double free. This could have
been a piece of cake with Valgrind, but unfortunately the first and
second frees were a few minutes of runtime apart, so all I got was the
"address was not recently malloc()ed..." message instead of the
backtrace corresponding to the first free.
When I increased the -free-list-vol to the maximum value
allowed by Valgrind, Valgrind aborted prematurely, apparently because
the 32G memory limit was reached. My machine had 96G, and I'm sure it
would have been enough for obtaining the backtrace of the first free.
Is it possible to overcome the 32G limit? I don't think
machines with more memory than that are rare.
Thanks,
Meir
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