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Summary:ASTERISK-27236: Segfault ast_channel_name (chan=0x0) at channel_internal_api.c:478 during T.38 Fax Receive
Reporter:Ross Beer (rossbeer)Labels:fax pjsip
Date Opened:2017-08-31 05:37:00Date Closed:2017-09-06 06:50:52
Priority:MajorRegression?
Status:Closed/CompleteComponents:Channels/chan_pjsip Resources/res_fax Resources/res_pjsip_t38
Versions:GIT Frequency of
Occurrence		Frequent
Related
Issues:
Environment:Fedora 23Attachments:( 0) core.2017-08-31T10-58-30+0100-thread1.txt
( 1) core.2017-08-31T11-14-13+0100-thread1.txt
Description:Segfault when receiving faxes via T.38

{noformat}
#0  0x00000000004cc917 in ast_channel_name (chan=0x0) at channel_internal_api.c:478
#1  0x00007f5c9c1afb7b in t38_reinvite_response_cb (session=session@entry=0x7f5cf459dc20, rdata=<optimized out>) at res_pjsip_t38.c:305
       status = {code = 200, reason = {ptr = <optimized out>, slen = <optimized out>}}
       state = 0x7f5cf45f1da0
       session_media = 0x0
       __PRETTY_FUNCTION__ = "t38_reinvite_response_cb"
{noformat}

At the time of the crash, the CLI shows the following:

{noformat}
res_fax.c:1947 receivefax_t38_init: channel 'PJSIP/<HOST>-00000036' timed-out during the T.38 negotiation.
{noformat}
Comments:By: Asterisk Team (asteriskteam) 2017-08-31 05:37:02.195-0500

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].
By: Ross Beer (rossbeer) 2017-09-01 05:31:44.994-0500

The issue looks related to issue ASTERISK-27110 and change https://gerrit.asterisk.org/#/c/6165/
By: Friendly Automation (friendly-automation) 2017-09-06 06:50:54.075-0500

Change 6387 merged by Jenkins2:
res_pjsip_t38:  Make t38_reinvite_response_cb tolerant of NULL channel

[https://gerrit.asterisk.org/6387|https://gerrit.asterisk.org/6387]
By: Friendly Automation (friendly-automation) 2017-09-06 06:55:03.170-0500

Change 6384 merged by Jenkins2:
res_pjsip_t38:  Make t38_reinvite_response_cb tolerant of NULL channel

[https://gerrit.asterisk.org/6384|https://gerrit.asterisk.org/6384]
By: Friendly Automation (friendly-automation) 2017-09-06 07:17:41.674-0500

Change 6385 merged by Jenkins2:
res_pjsip_t38:  Make t38_reinvite_response_cb tolerant of NULL channel

[https://gerrit.asterisk.org/6385|https://gerrit.asterisk.org/6385]
By: Friendly Automation (friendly-automation) 2017-09-06 07:21:07.840-0500

Change 6386 merged by Jenkins2:
res_pjsip_t38:  Make t38_reinvite_response_cb tolerant of NULL channel

[https://gerrit.asterisk.org/6386|https://gerrit.asterisk.org/6386]