Just in case anyone runs into this kind of problem in the future - commits 72f5eaeeef0239ebd16a2d645b83e83eb1a2b506 and 5fe2a1a1c67b550431dcae3c98701073f7edd953 (currently in the master branch only) seem to fix this.
On 05/28/2018 06:01 PM, Ivaylo Markov wrote: > Hello, > > I am trying to set up Kamailio as a push notifications proxy, closely > following the example in the "Kamailio in a Mobile World" presentation > (https://www.slideshare.net/FedericoCabiddu/kamailioinamobileworld-51617342). > I am running Debian 9 and Kamailio 5.1.3 from the official Debian > repositories. > I believe the main modules involved in the issue below are tm, tmx, and > tsilo. > > Every call passing through the proxy leads to a small memory leak in the tm > module - there is a large amount of "delayed free" memory cells from tm's > internal hash table. At some point the shared memory runs out and Kamailio > restarts. Using the "kamcmd corex.shm_summary" command I was able to see > that the top users of shared memory are "tm: h_table.c: build_cell" and > "core: core/sip_msg_clone.c: sip_msg_shm_clone" with the same allocation > count. > > I experimented with removing different parts of the configuration and > noticed that commenting out the "t_continue(...)" call in the "PUSHJOIN" > route > (see slide #22) prevents the leak from happening. Maybe something in that > function is incrementing the reference counter to the hash table cell, but > it is not decrementing the counter when done? > > I tried looking around the source code of the tm and tmx modules, but saw > nothing suspicious. I also tried using gdb with a breakpoint in > t_continue_helper (tm/t_suspend.c:166) hoping to see what else is accessing > the htable cell, but was unable to find anything of use. > > Has someone encountered anything like this? Can you provide more directions > on debuggin this? I can provide some bits of configuration, but an entire > test setup would be rather difficult, unfortunately. > > Thank you for your time, > Ivo > > > _______________________________________________ > Kamailio (SER) - Users Mailing List > [email protected] > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
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