Debugging with gdb on FreeNAS

In case the UrBackup server crashes on FreeNAS a gdb stacktrace is a very helpful tool in finding the cause of the crash.

Steps to get a gdb backtrace:

1. Enter the shell of the UrBackup jail
2. Install gdb in the shell via the command
   pkg_add -r gdb
3. Shutdown the urbackup server:
   killall urbackupsrv
4. Install tmux:
   pkg_add -r tmux
5. Run tmux:
   tmux
6. Start the UrBackup server in gdb:
   gdb --args /usr/local/sbin/urbackupsrv run -g 104857600 -u root
   
7. Start the program in gdb:
   run
8. Once it crashed enter the shell of the plugin jail again and attach to the tmux session:
   tmux attach
   
9. Enter "bt" to get the backtrace to the location it crashed:
   bt
10. Add the trace information to your bug report

How to get debug logging info:

1. Export the Plugin filesystem via filesharing
2. Access debug logfile at JAIL_ROOT/var/log