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This document is written to help users get a proper backtrace for Asterisk when trying to debug a issue.

Backtrace of a Running Asterisk instance

From the Linux CLI we need to first get the Asterisk process ID so we can attach to asterisk.

Process ID

[root@localhost ~]# ps aux | grep asterisk
root       847  0.0  0.0   6260   240 ?        S    Jan17   0:00 /bin/sh /usr/sbin/safe_asterisk -U asterisk -G asterisk -g
asterisk   851  0.4  1.7 123008 45676 ?        Sl   Jan17 326:29 /usr/sbin/asterisk -f -U asterisk -G asterisk -g -vvvg -c

In our example above the Asterisk process ID we need is 851 as that is the actual Asterisk process. You do not want the process ID of the Safe Asterisk script which is 847.

Now we will run the actual back trace.

Executing Backtrace

[root@localhost ~]# gdb -ex "thread apply all bt" --batch /usr/sbin/asterisk 851 > /tmp/backtrace-threads.txt

Replace the 851 with your actual process ID.

The backtrace file will now be in the /tmp directory called backtrace-threads.txt

Finding Backtrace

[root@localhost ~]# cd /tmp/
[root@localhost tmp]# ls
backtrace-threads.txt  freepbx_debug.log

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Backtrace of a Running Asterisk instance

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