where is my xfburn coredump

Question

I'm trying to use xfburn in xubuntu-20.04.3, and it fails on several of my hosts. I'd like to submit a bug, but there's a problem. It ends with a message about SIGSEGV and "core dumped" but I don't see a core dump anywhere.

Am I looking in the wrong place or did it not really happen?

Running "strace xfburn -i" as root, it ends with

--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- +++ killed by SIGSEGV (core dumped) +++ Segmentation fault (core dumped) root@camelot-b:~#

Sorry if the above is all run together -- I can't seem to make blockquotes work right.

Answer 1

Read man ulimit. You must enable coredumps for your process via

ulimit -c unlimited

Coredumps are, by default, disabled. This choice was made long ago to avoid novice confusion, and, to avoid filling the tiny disks of the times with random SEGV victims.

Answer 2

From my reading of man xfburn, I don't think you need to be running xfburn as root. It's unnecessary, and running anything as root is dangerous, enabling more powerful mistakes.

Many device access problems can be resolved through group membership changes.

Assuming a device name of /dev/cdrom, do.

ls -l /dev/cdrom

Specifically, if ls -l shows that the group permissions (the second "rwx" triplet) is "rw" (e.g."-rw-rw----"), then, adding oneself to the group that owns the device will grant rw access.

Here's how:

device="/dev/cdrom"
sudo adduser $USER $(stat -c "%G" $device)

This allows you membership in the group that can rw the device, but there is one more step.

To make all your processes members of the new group, logout and login. Group memberships are set up at login time.

To create a single process in the new group (for testing, prior to logout/login):

newgrp $(stat -c "%G" $device)  

or, just type the group name. See man newgrp.