LTTng » LTTng-tools

If you have a '.lttngrc' file in your home directory which references a non-existing session, for example:

session=my-totally-non-existing-session

When running commands you will get a very generic and not very helpful error message, for example:

[mjeanson@mj-fedora-rawhide ~]$ lttng start
Error: Failed to format string: string pointer is null

[mjeanson@mj-fedora-rawhide ~]$ lttng stop
Error: Failed to format string: string pointer is null

By comparision, trying to start a non-existing session without a .lttngrc give a more helpful error message:

[mjeanson@mj-fedora-rawhide ~]$ lttng start
PWARN - 11:18:35.707322797 [7838/7838]: Failed to open configuration file '/home/mjeanson/.lttngrc': No such file or directory (in open_config() at conf.cpp:57)
Error: Can't find valid lttng config /home/mjeanson/.lttngrc
Did you create a session? (lttng create <my_session>)