[asterisk-bugs] [JIRA] (ASTERISK-28470) Mutex deadlock in audio_audiohook_write_list

[Andre Heber (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-28470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andre Heber updated ASTERISK-28470:
-----------------------------------

    Attachment: stack_trace_2.png
                stack_trace_1.png
                mutex_2.png
                mutex_1.png
                info_threads.png

> Mutex deadlock in audio_audiohook_write_list
> --------------------------------------------
>
>                 Key: ASTERISK-28470
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28470
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: General
>    Affects Versions: 16.3.0
>         Environment: CentOS 6.10
>            Reporter: Andre Heber
>            Assignee: Andre Heber
>         Attachments: info_threads.png, mutex_1.png, mutex_2.png, stack_trace_1.png, stack_trace_2.png
>
>
> In main/audiohook.c in the function "audio_audiohook_write_list" is the following code:
> {code:java}
>     ast_audiohook_lock(audiohook);
> 		if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING) {
> 			AST_LIST_REMOVE_CURRENT(list);
> 			removed = 1;
> 			ast_audiohook_update_status(audiohook, AST_AUDIOHOOK_STATUS_DONE);
> 			ast_audiohook_unlock(audiohook);
> {code}
> But "ast_audiohook_update_status" also locks "audiohook" "if (audiohook->status != AST_AUDIOHOOK_STATUS_RUNNING)", which results in a frozen thread.
> This happens 3x in "audio_audiohook_write_list" and 1x in "dtmf_audiohook_write_list".



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