[Freeswitch-dev] How can I detect the cause of a potential memory leak?

[Anthony Minessale]

That report showed me 2 leaks.

1) in mod_cdr_sqlite where it was expanding a variable template and not
checking if it needed to free the results.
2) in mod_dptools in the user channel code.

Wait, there's more.

Fixing the leak in the user channel then led me to realize there was a
regression in the change that introduced that leak that was breaking the
code that copies all the variables from the {} into the far end channel.

anyway, try out GIT head.


On Tue, Nov 15, 2011 at 3:25 AM, François Delawarde <
fdelawarde at wirelessmundi.com> wrote:

> I did a small valgrind test with git HEAD:
> 1. turn on, make 5 calls or so
> 2. leave FS on for the night (without calls)
> 3. shut it down cleanly in the morning
>
> During execution, some "Warning: invalid file descriptor -1 in syscall
> close()" (4-5 for each call + some extras).
>
> After shutting down, something strikes me in the vg.log file:
> "definitely lost: 173,407,885 bytes in 84,680 blocks"
>
> Is this normal?
>
> valgrind log: http://pastebin.freeswitch.org/17779
>
> Thanks,
> François.
>
>
> On Mon, 2011-11-14 at 11:41 -0600, Anthony Minessale wrote:
> > valgrind is your best bet:
> >
> > valgrind --tool=memcheck --log-file=vg.log --leak-check=full
> > --leak-resolution=high
> > --show-reachable=yes /usr/local/freeswitch/bin/freeswitch -vg
> >
> >
> > run this on normal traffic for a while and get the log file.
> >
> >
> > if you unload mods it would not help with a leak but it would with a
> > swelling pool.
> >
> >
> >
> > On Mon, Nov 14, 2011 at 11:30 AM, François Delawarde
> > <fdelawarde at wirelessmundi.com> wrote:
> >         Hello,
> >
> >         I'm experiencing what I think is a memory leak in a production
> >         system
> >         with a recent git (2-Nov), with FS consuming >5GB and
> >         increasing after a
> >         few days with never more than 10 calls at once.
> >
> >         While the users are not experiencing problems so far, I'm a
> >         bit worried.
> >         So I have a few questions:
> >
> >         - How can I be sure it's a leak and not some memory pool thing
> >         that FS
> >         would free when the system needs (system has 10GB total)?
> >
> >         - If I unload modules one by one, is the memory used by this
> >         module
> >         freed immediately?
> >
> >         - What would be a "good" way to try and narrow down the cause?
> >         Is
> >         valgrind a good tool for that?
> >
> >         Of course I'll try with GIT HEAD and try my best to find the
> >         cause
> >         before considering to add a new Jira issue, otherwise it's
> >         quite
> >         useless.
> >
> >
> >         Thanks,
> >         François.
> >
> >
> >
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> > --
> > Anthony Minessale II
> >
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-- 
Anthony Minessale II

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