Debug a Server

If you can’t get a core dump, or the problem doesn’t result in a core dump, you may have to run the server under gdb. To do this, ensure that you have symbols in the binaries (i.e. a 'non-stripped' binary) by re-building the server as described in the Core Dumps section. Then, run the server under gdb as follows:

$ gdb radiusd

Enable logging in gdb via the following commands:

(gdb) set logging file gdb-radiusd.log
(gdb) set logging on

Tell gdb to pass any necessary command-line arguments to the server:

(gdb) set args ...

Where the ``…'' are the command-line arguments you normally pass to radiusd. For debugging, you probably want to do:

(gdb) set args -fxx

Then, do:

(gdb) run

When something interesting happens, you can hit CTRL-C in the window, and you should be back at the gdb prompt:

(gdb)

Next, follow the instructions in the Extract Information.