Segmentation fault when clicking on "New Sequence"

[Patrick Rauscher]

I'm unable to create a new Sequence in Functions-panel, as qlc+ crashes every time I try. I'm running arch linux with qlc+ compiled from AUR.

[david garyga]

Hi,

Please share a workspace,

And the version (or commit sha1) of your QLC+ version.

Thanks

[Patrick Rauscher]

Thank you! It happens in all workspaces I used. You find one attached.

% qlcplus --version

Q Light Controller Plus version 4.8.3
This program is licensed under the terms of the Apache 2.0 license.
Copyright (c) Heikki Junnila (hjunnila@users.sf.net)
Copyright (c) Massimo Callegari (massimocallegari@yahoo.it)

[david garyga]

This button ?

Seems to be working fine.

Maybe an issue with your build method ?

Or with the AUR package ?

[Patrick Rauscher]

Exactly this button. I installed it using this build script: https://aur.archlinux.org/packages/ql/qlcplus/PKGBUILD - so basically it ran qmake-qt4 and then make.
How can I debug this issue?

[Jano Svitok]

How to debug:

1. (optional) reinstall
2. ulimit -c unlimited <-- set core size to unlimited
3. start qlc+ in your home dir from commandline
4. reproduce the crash
5. "core" file should appear in current directory
6. gdb /usr/bin/qlcplus core
7. examine call stack, tutorial here: http://www.unknownroad.com/rtfm/gdbtut/gdbstack.html
8. report the backtrace command result here. Alternatively, you can try to find last frame that is in the qlcplus code (i.e. not in qt or std lib). Check that frame for any obvious problems, like null/invalid pointers, deleted memory, division by zero,...

If the backtrace doesn't contain source lines, rebuild qlcplus in DEBUG mode (you'll have to edit variables.pri file.

[david garyga]