[asterisk-dev] Memory leak when use ast_set_read_format

[MohammedShehzad]

On Wed, May 26, 2010 at 1:11 AM, Mark Michelson wrote:

> On 05/25/2010 08:18 AM, MohammedShehzad wrote:
> >
> > Hi all,
> >
> > My custom IVR application of asterisk records the voice of user.
> > It sets the read format to sleaner using ast_set_read_format funciton
> > on line number  2144.
> >         flag = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
> > Which is leaving behind some leaks : below is the part of the trace of
> > asterisk under run valgrind as below:
> >
> > ==11972==
> > ==11972== 52,512 bytes in 3 blocks are definitely lost in loss record
> > 115 of 117
> > ==11972==    at 0x4A04B32: calloc (vg_replace_malloc.c:279)
> > ==11972==    by 0x4A601D: newpvt (utils.h:359)
> > ==11972==    by 0x4A714F: ast_translator_build_path (translate.c:288)
> > ==11972==    by 0x438270: set_format (channel.c:2778)
> > ==11972==    by 0x162A19A8: ??? (app_custom_ivr.c:2144)
> > ==11972==    by 0x1629FB83: ??? (app_custom_ivr.c:1099)
> > ==11972==    by 0x1629EB25: ??? (app_custom_ivr.c:525)
> > ==11972==    by 0x47F21C: pbx_extension_helper (pbx.c:537)
> > ==11972==    by 0x4814E0: __ast_pbx_run (pbx.c:2317)
> > ==11972==    by 0x482158: pbx_thread (pbx.c:2634)
> > ==11972==    by 0x4AB3EB: dummy_start (utils.c:865)
> > ==11972==    by 0x376EC06616: start_thread (in
> > /lib64/libpthread-2.5.so <http://libpthread-2.5.so>)
> > ==11972==    by 0x376E4D3C2C: clone (in /lib64/libc-2.5.so
> > <http://libc-2.5.so>)
> > ==11972==
> >
> > I do reset the read format back to old read format, but even though it
> > is showing leaks.
> >
> > Any one can please let me know what i am missing in using
> > ast_set_read_format function?
> >
> >
> > --
> >
> > -MohammedShehzad
>
> ast_set_read_format will allocate memory if it needs to create a
> translation path. However, when you call ast_set_read_format, the old
> translation path on the channel will be freed first. Furthermore, when a
> channel is destroyed, the translation path is freed as well.
>
> When are you seeing this output from valgrind? Are you stopping Asterisk
> with channels still up? if that is the case, then it is not surprising
> to see that there is still memory allocated for translation paths.
>
> Mark Michelson
>
> I assume that there is no need to call any function to destroy the channel
implicitly.
I get this output after making few calls which hits the custom IVR. Although
I stop the asterisk only after making sure that no channel is active.

-- 

-MohammedShehzad
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