[asterisk-bugs] [JIRA] (ASTERISK-29846) channels: bad ao2 ref causes crash

[N A (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-29846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=257876#comment-257876 ] 

N A commented on ASTERISK-29846:
--------------------------------

Sorry, I forgot to comment on this before:
The source code should only be different by a few lines, at most.


        if (!concise) {
                numchans = ast_active_channels();
                ast_cli(a->fd, "%d active channel%s\n", numchans, ESS(numchans));
                if (ast_option_maxcalls)
                        ast_cli(a->fd, "%d of %d max active call%s (%5.2f%% of capacity)\n",
                                ast_active_calls(), ast_option_maxcalls, ESS(ast_active_calls()),
                                ((double)ast_active_calls() / (double)ast_option_maxcalls) * 100.0);
                else
                        ast_cli(a->fd, "%d active call%s\n", ast_active_calls(), ESS(ast_active_calls()));

                ast_cli(a->fd, "%d call%s processed\n", ast_processed_calls(), ESS(ast_processed_calls()));
        }
        ao2_ref(channels, -1);

        return CLI_SUCCESS; <--- This is line 1218 for me:

I think it's off by 1 line, though, because the ao2_ref is line 1217, rather than 1218 as in those backtraces above, but it seems close enough?


> channels: bad ao2 ref causes crash
> ----------------------------------
>
>                 Key: ASTERISK-29846
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29846
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: General
>    Affects Versions: 18.9.0
>         Environment: Debian 10
>            Reporter: N A
>            Assignee: Unassigned
>
> Currently, Asterisk crashes randomly every few days, not seemingly linked to anything going on at the moment. In fact, prior to this crash, the system was completely idle (no calls) for the previous 34 minutes.
> Here is a backtrace from right before the last crash, useful as it has line numbers:
> 01:35:03 ERROR[13076] : Got 10 backtrace records
> # 0: [0x55ca492928cc] asterisk utils.c:2727 __ast_assert_failed()
> # 1: [0x55ca49109db3] asterisk astobj2.c:212 log_bad_ao2()
> # 2: [0x55ca4910a73a] asterisk astobj2.c:501 __ao2_ref()
> # 3: [0x55ca4917269a] asterisk cli.c:1218 handle_chanlist()
> # 4: [0x55ca4917859f] asterisk cli.c:3020 ast_cli_command_full()
> # 5: [0x55ca49178734] asterisk cli.c:3048 ast_cli_command_multiple_full()
> # 6: [0x55ca49101e0c] asterisk asterisk.c:1424 netconsole()
> # 7: [0x55ca4928fb57] asterisk utils.c:1572 dummy_start()
> # 8: [0x7f257c305fa3] libpthread.so.0 pthread_create.c:487 start_thread()
> # 9: [0x7f257bd994cf] libc.so.6 clone.S:97 clone()



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