My guess is that the test might be hitting the following code from
kernel/sched/core.c:
#ifdef CONFIG_RT_GROUP_SCHED
/*
* Do not allow realtime tasks into groups that have no runtime
* assigned.
*/
if (rt_bandwidth_enabled() && rt_policy(policy) &&
task_group(p)->rt_bandwidth.rt_runtime == 0 &&
!task_group_is_autogroup(task_group(p))) {
retval = -EPERM;
goto unlock;
}
#endif
Which is not really about the capabilities. That is just a guess.
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https://bugs.launchpad.net/bugs/1876697
Title:
test_regression_testsuite from ubuntu_qrt_apparmor failed on Focal zVM
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