LTTng » LTTng-tools

(User belongs to tracing group, root lttng-sessiond is running)

$ lttng create t
Session t created.
Traces will be written in /home/daniel/lttng-traces/t-20130725-161359
$ lttng enable-channel ch0 -u --output splice
Error: Channel ch0: Operation not supported (session t)
Warning: Some command(s) went wrong
$ lttng enable-channel ch1 -k --output mmap
Error: Channel ch1: No kernel consumer detected (session t)
Warning: Some command(s) went wrong
$ lttng destroy t
Session t destroyed
$ sudo service lttng-sessiond restart

The lttng-sessiond service had to be restarted as the root user-space lttng-consumerd daemon was hung (as shown by the system monitor). You can also tell because lttng enable-channel ch1 -k --output mmap works fine if not preceded by lttng enable-channel ch0 -u --output splice.