Comment # 27 on bug 1137373 from Fabian Vogt

(In reply to Franck Bui from comment #26)
> (In reply to Andr� Werlang from comment #25)
> > In sum, I like to address the root cause, at first it seems to be systemd,
> 
> The root cause is systemd indeed, more precisely a race can happen when PID1
> is reloading and udevd has not finished starting.
> 
> This bug has been reported to upstream, see comment #24.
> 
> > but the default openSUSE TW install needs to address the issue by
> > dealing with the out-of-place service I mention above.
> 
> Indeed, it seems that the btrfs stuff abuses of PID1 reloading and therefore
> it's easier to trigger systemd race on TW than on other distros. It would be
> nice if this could be fixed too even though it's not the root cause. That
> would improve the boot process as PID1 reloading is quite expensive
> operation.

There's a report or request somewhere asking about that, but I don't think it's
getting anywhere. It would be great if you could push for this.
I guess converting the refresh service to a generator on startup which
generates the .timer units based on sysconfig would be an option, or even just
dropping the sysconfig way of configuration altogether.