[LITMUS^RT] Problem on launching real time tasks

[Youcef Amine Benabbas]

Hi all,

I am running litmus under qemu-system-x86_64.I tried to launch a task T
that periodically prints some text. I basically added a printf to
base_task.c in liblitmus/bin. Unfortunately I get the following error
after launching the task:

[  759.915466] Setting up rt task parameters for process 865.
init_litmus() ok.
[  759.918748] Setting up rt task parameters for process 865.
sporadic_global(EXEC_COST, PERIOD) failed: Device or resource busy
task_mode(LITMUS_RT_TASK) failed: Unknown error 4294967274

I have set the GSN-EDF scheduler then launched the
base_task: ./rt_launch 10 100 ./base_task

I am not sure why this does not work since rtspin works fine.

I am sorry if my problem is "stupid" but I am trying to do this for a
couple of days without success.

Kind regards,
Youcef Amine Benabbs