[asterisk-bugs] [JIRA] (ASTERISK-27944) res_pjsip_t38: Crash receiving 1xx responses other than 100 before 200 for T.38 reINVITE

[Richard Mudgett (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=244368#comment-244368 ] 

Richard Mudgett commented on ASTERISK-27944:
--------------------------------------------

The original and latest backtraces show the same thing.  :(  I don't understand how it can get in that state after the original fix.  The backtraces are showing the code is optimized.  Optimization may be playing tricks on the backtrace and not showing what is going on.  The patch for ASTERISK-27563 fixed a problem where res_pjsip modules were always optimized even when DONT_OPTIMIZE was enabled.

* An unoptimized backtrace may show a better picture of what is going on.
* Does it seem to crash for a particular caller or calling device?

> res_pjsip_t38: Crash receiving 1xx responses other than 100 before 200 for T.38 reINVITE
> ----------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-27944
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27944
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip_t38
>    Affects Versions: 15.2.2, 15.4.1
>            Reporter: Joshua Elson
>            Assignee: Richard Mudgett
>            Severity: Minor
>              Labels: fax, pjsip
>         Attachments: core.com-2018-08-01T15-46-31-0600-brief.txt, core.com-2018-08-01T15-46-31-0600-full.txt, core.com-2018-08-01T15-46-31-0600-locks.txt, core.com-2018-08-01T15-46-31-0600-thread1.txt, core.iad.com-2018-06-25T14-06-14-0600-brief.txt, core.iad.com.2018-06-25T14-06-14-0600-full.txt, core.iad.com.2018-06-25T14-06-14-0600-locks.txt, core.iad.com.2018-06-25T14-06-14-0600-thread1.txt, core.iad.com-2018-07-09T09-14-58-0600-brief.txt, core.iad.com-2018-07-09T09-14-58-0600-full.txt, core.iad.com-2018-07-09T09-14-58-0600-locks.txt, core.iad.com-2018-07-09T09-14-58-0600-thread1.txt, crash_dialplan.txt
>
>
> Crash of Asterisk on T38 session rejection via PJSIP.
> This is happening somewhat routinely on a number of our nodes. The error message in the logs will appear as:
> [2018-06-25 14:06:04] WARNING[3368][C-00005bd3] res_fax.c: channel 'PJSIP/FC-DFW-PROXY-0000f050' refused to negotiate T.38
> There will be a crash with the attached backtrace.



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