[Lxc-users] Problem with pthread_create SCHED_RR - Operation not permitted

[Serge Hallyn]

This appears to be a cgroup issue (presumably by design).  Without involving
lxc, just do

sudo bash
# mkdir /sys/fs/cgroup/cpu/1
# echo $$ > /sys/fs/cgroup/cpu/1/tasks
# (run your test)
pthread_create failed - Operation not permitted

-serge

Quoting Serge Hallyn (serge.hallyn at canonical.com):
> Quoting Hans Feldt (Hans.Feldt at ericsson.com):
> > Hi,
> > 
> > As the subject says, pthread_create for SCHED_RR fails with EPERM(1) in my 
> > container. Program run as root.
> > 
> > Same program run directly on host works. I tried disabling the apparmor stuff 
> > but no luck.
> > 
> > host: ubuntu 12.04
> > container: generated with the "ubuntu" template
> > 
> > Any ideas?
> 
> Hm, everything I see in the kernel source suggests that CAP_SYS_NICE should
> suffice.  (I assume you didn't add that to lxc.cap_drop)  But I don't have
> a solid grasp of the the autogroup code under kernel/sched.
> 
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