Svante Signell, on Wed 31 Aug 2016 13:42:58 +0200, wrote: > On Wed, 2016-08-31 at 13:28 +0200, Samuel Thibault wrote: > > Svante Signell, on Wed 31 Aug 2016 13:24:34 +0200, wrote: > > > > Re-read your test again: it requests nice -19, i.e. something which is > > > > reserved to root. No wonder you are getting a permission denied. > > > Explain please, I get the same output also for running as root: > > > check_setpriority: can't set priority: Permission denied > > Then there is probably also a bug about not letting root do it. But > > that's *another* bug. > > Which is the original bug then?
You didn't say what application you are actually trying to fix, but the issue you have shown is that task_priority returns permission denied when change_threads is true (and I guessed you want that to work as normal user). I just said that the test was expected to have issues since the nice value is negative. > Doing some more tests the priority can be set to > a number>=0, but not negative, irrespective of being root or not... Which is expected. So there is actually no bug for non-root. Now, it's not normal that a root process can't use a negative number. So investigation is needed there. Samuel
