[asterisk-bugs] [JIRA] (ASTERISK-20994) AMI command reception after app_confbridge.so unload results in crash

[Walter Doekes (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=203423#comment-203423 ] 

Walter Doekes commented on ASTERISK-20994:
------------------------------------------

@matt: Deleting the .so while loaded is safe. In fact, it is better than not doing it.

If you copy a new .so on top of the old one, strange things happen.
If you delete the old one first, the kernel still keeps the old copy around until all fd's to it are closed. This is what the installer does on make install.
                
> AMI command reception after app_confbridge.so unload results in crash
> ---------------------------------------------------------------------
>
>                 Key: ASTERISK-20994
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20994
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Applications/app_confbridge, General
>    Affects Versions: 11.2.1
>         Environment: debian 6.0.6
>            Reporter: Jeremy Kister
>            Assignee: Rusty Newton
>            Severity: Critical
>         Attachments: backtrace.txt, jira_asterisk_20994_v11.patch, module-unload-backtrace.txt, module-unload-console-debug.txt, module-unload-network.txt
>
>
> # asterisk is running and happy... then:
> {code}
> pbx1> cd /usr/local/src/asterisk/asterisk-11.2.1
> pbx1> rm apps/app_confbridge.so 
> pbx1> make
> make[1]: Entering directory `/usr/local/src/asterisk/asterisk-11.2.1'
>    [LD] app_confbridge.o confbridge/conf_config_parser.o confbridge/conf_state.o confbridge/conf_state_empty.o confbridge/conf_state_inactive.o confbridge/conf_state_multi.o confbridge/conf_state_multi_marked.o confbridge/conf_state_single.o confbridge/conf_state_single_marked.o -> app_confbridge.so
> make[1]: Leaving directory `/usr/local/src/asterisk/asterisk-11.2.1'
>  +--------- Asterisk Build Complete ---------+
>  + Asterisk has successfully been built, and +
>  + can be installed by running:              +
>  +                                           +
>  +                make install               +
>  +-------------------------------------------+
> pbx1> cp apps/app_confbridge.so /usr/lib/asterisk/modules/
> pbx1> ls /tmp/core*
> ls: cannot access /tmp/core*: No such file or directory
> pbx1> asterisk -r
> Asterisk 11.2.1, Copyright (C) 1999 - 2012 Digium, Inc. and others.
> Created by Mark Spencer <markster at digium.com>
> Asterisk comes with ABSOLUTELY NO WARRANTY; type 'core show warranty' for details.
> This is free software, with components licensed under the GNU General Public
> License version 2 and other licenses; you are welcome to redistribute it under
> certain conditions. Type 'core show license' for details.
> =========================================================================
> Connected to Asterisk 11.2.1 currently running on pbx1 (pid = 16898)
> pbx1*CLI> 
> Disconnected from Asterisk server
> Asterisk cleanly ending (0).
> Executing last minute cleanups
> pbx1> ls /tmp/core*
> core.pbx1.example.net-2013-01-27T13:15:04-0500
> pbx1> 
> {code}

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