[asterisk-bugs] [JIRA] (ASTERISK-27287) Cyclic reference between res_pjsip and res_pjsip_session

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=238841#comment-238841 ] 

Asterisk Team commented on ASTERISK-27287:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> Cyclic reference between res_pjsip and res_pjsip_session
> --------------------------------------------------------
>
>                 Key: ASTERISK-27287
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27287
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip
>    Affects Versions: 13.17.2, 14.6.2, GIT, 15.0.0-rc1
>            Reporter: Alexander Traud
>
> Since Asterisk 13.13, the module res_pjsip requires the module res_pjsip_session because it inits a {{pjsip_message_filter}} (formerly {{pjsip_message_ip_updater}}).
> The call stack is as follows:
> * res_pjsip → load_module → ast_res_pjsip_init_message_filter → ast_sip_session_register_supplement
> * unload_pjsip → ast_res_pjsip_cleanup_message_filter →  ast_sip_session_unregister_supplement
> This issue has two symptoms:
> * In the build configuration (menuselect), when {{res_pjsip_session}} is disabled but {{res_pjsip}} stays enabled, Asterisk crashes with {{/usr/lib/asterisk/modules/res_pjsip.so: undefined symbol: ast_sip_session_register_supplement}}.
> * In the Command-Line Interface (CLI), {{core stop gracefully}} and {{core stop when convenient}} give the error {{Some modules could not be unloaded, switching to fast shutdown}}.
> Consequently, that {{pjsip_message_filter}} introduces a cyclic reference and the module {{res_pjsip_session}} can never be unloaded, because the reference count never drops to zero. Furthermore, menuselect shows an incorrect build dependency between those modules.
> I have no idea how to fix this, because I am not into the architecture of res_pjsip enough to understand why {{ast_sip_session_(un)register_supplement}} is required at all. Therefore, I am just reporting this issue and cannot contribute any patch or suggestion.



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