[asterisk-bugs] [JIRA] (ASTERISK-27121) res_pjsip_mwi: Memory leak on reload

[Asterisk Team (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-27121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Asterisk Team updated ASTERISK-27121:
-------------------------------------

    Target Release Version/s: 13.24.0

> res_pjsip_mwi: Memory leak on reload
> ------------------------------------
>
>                 Key: ASTERISK-27121
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27121
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip_mwi
>    Affects Versions: 13.17.0
>            Reporter: Sergej Kasumovic
>              Labels: pjsip
>      Target Release: 13.24.0
>
>         Attachments: refs.txt
>
>
> There seems to be a memory leak around stasis_cache which can be easily replicated with reload of res_pjsip_mwi module. I have tracked it down with REF_DEBUG config option. This is on git version of Asterisk 13 branch (cad74cdd8f). 
> My test case includes around 30 PJSIP endpoints with defined mailboxes option. 
> The number of endpoints will affect the impact of memory leak due to number of active MWI subscriptions. 
> Basically, here is the replicable scenario:
> Fetch RSS of Asterisk process
> Perform 200 reloads of res_pjsip_mwi
> Fetch RSS of Asterisk process again
> {noformat}
> ps -o rss -p $(pidof -s asterisk)
>   RSS
> 69048
> for _ in $(seq 1 200); do asterisk -rx 'module reload res_pjsip_mwi.so' >/dev/null; done
> ps -o rss -p $(pidof -s asterisk)
>   RSS
> 90460
> {noformat}
> By repeating the for loop, RSS of Asterisk process simply grows. 
> The problem seems to be around subscribe and unsubscribe message that got cached in stasis_cache. Each subscribe message is cached. However, on unsubscribe message, subscribe message is replaced with unsubscribe message and is never freed as the id of new subscription messages changes. 
> I cannot know for sure what is an ideal fix for this, but so far I was able to stop it by doing one of the following: 
> 1) Do not cache stasis_subscription_change_type() messages in stasis_cache: caching_topic_exec. It seems app_voicemail is reading these messages from cache when starting polling thread, so not sure if this is ideal solution. 
> 2) On unsubscribe message received in caching_topic_exec, make sure to remove subscription and cleanup the received message
> 3) Add another stasis_cache_clear_type() message in main/stasis.c for type stasis_subscription_change_type when doing unsubscribe
> When such fix is performed RSS does grow a bit, but then it slows down considerably. 



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