New comment by Logarithmus on void-packages repository

https://github.com/void-linux/void-packages/issues/28728#issuecomment-782787488

Comment:
It seems that the problem is both with `musl` & missing `CONFIG_RT_GROUP_SCHED` kernel option.

> Currently I'm investigating these stability issues with `pipewire`. It seems that `pipewire` is trying to use `rtkit` to make audio/video processing run in real time. Unfortunately, it fails to do so:
> ```
> 2020-11-16T03:49:59.73350 daemon.err: Nov 16 03:49:59 rtkit-daemon[3165]: Failed to make ourselves RT: Function not implemented
> 2020-11-16T03:49:59.73602 daemon.warn: Nov 16 03:49:59 rtkit-daemon[3165]: Warning: failed to read scheduler policy: Function not implemented
> 2020-11-16T03:49:59.73620 daemon.debug: Nov 16 03:49:59 rtkit-daemon[3165]: Supervising 0 threads of 0 processes of 1 users.
> 2020-11-16T03:49:59.73645 daemon.debug: Nov 16 03:49:59 rtkit-daemon[3165]: Supervising 0 threads of 0 processes of 1 users.
> 2020-11-16T03:49:59.74118 daemon.err: Nov 16 03:49:59 rtkit-daemon[3165]: Failed to make ourselves RT: Function not implemented
> ```
> After a bit of searching, I've found these bugs:
> https://bugzilla.redhat.com/show_bug.cgi?id=1229700
> https://bugs.gentoo.org/show_bug.cgi?id=569546
>
> I've built `linux5.9` for `x86_64` with `CONFIG_RT_GROUP_SCHED` disabled.
> For some strange reason, nothing changed, the error persists. Luckily, screen sharing works without `rtkit`.
> I guess that those rare issues with screen sharing, which were described above, may be caused by `rtkit` not working.