Hello,

there is (still) a memory leak in memcached module, discovered on a report by Dragos Oancea.

The pkg usage logs are like:

0(24328) NOTICE: qm_status:    19010. N  address=0x7fb23683bc98 frag=0x7fb23683bc68 size=8 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: ../../parser/../ut.h: pkg_str_dup(733)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed
 0(24328) NOTICE: qm_status:    19011. N  address=0x7fb23683bd00 frag=0x7fb23683bcd0 size=48 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: memcached.c: mcd_malloc(127)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed
 0(24328) NOTICE: qm_status:    19012. N  address=0x7fb23683bd90 frag=0x7fb23683bd60 size=8 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: ../../parser/../ut.h: pkg_str_dup(733)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed
 0(24328) NOTICE: qm_status:    19013. N  address=0x7fb23683bdf8 frag=0x7fb23683bdc8 size=48 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: memcached.c: mcd_malloc(127)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed
 0(24328) NOTICE: qm_status:    19014. N  address=0x7fb23683be88 frag=0x7fb23683be58 size=8 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: memcached.c: mcd_malloc(127)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed
 0(24328) NOTICE: qm_status:    19015. N  address=0x7fb23683bef0 frag=0x7fb23683bec0 size=16 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: ../../parser/../ut.h: pkg_str_dup(733)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed
 0(24328) NOTICE: qm_status:    19016. N  address=0x7fb23683bf60 frag=0x7fb23683bf30 size=8 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: memcached.c: mcd_malloc(127)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed
 0(24328) NOTICE: qm_status:    19017. N  address=0x7fb23683bfc8 frag=0x7fb23683bf98 size=24 used=1
 0(24328) NOTICE: qm_status:           alloc'd from memcached: ../../parser/../ut.h: pkg_str_dup(733)
 0(24328) NOTICE: qm_status:          start check=f0f0f0f0, end check= c0c0c0c0, abcdefed

The one related to pkg_str_dup() should be fixed by the commit:

- http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=6faf12653c1db9f011b1826061824c831bda3f58

The other one is related to mcd_malloc(), which I guess it is due to the function that returns the value from memchache, memcached_get() used in  pv_get_mcd_value_helper() -- the returned object has to be freed by calling code, according to:

- http://docs.libmemcached.org/memcached_get.html

Since the libmemcached was initialized with wrappers around pkg malloc/free, I expect the respective free function has to be used to free the result.

Can any of memcached devs check my commit and investigate further the second leak?

Cheers,
Daniel

--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Trainings - Berlin, Nov 25-28; Miami, Nov 18-20, 2013
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