Comment # 36 on bug 1137373 from Michael Hirmke

(In reply to Franck Bui from comment #35)
> (In reply to ���������������� ���������� from comment #34)
> > Can this btrfsmaintenance just be removed by default? It seem to cause more
> 
> For btrfsmaintenance complaints can you please use bug #1165780 instead ?
> 
> This bug deals specifically with the race that might happen when PID1 is
> reloading.
> 
> Thanks

In the meantime I found a workaround.
Whenever an update triggered a reload of PID 1, run "init 3" before running
"init 6". Since then, I never had this problem any longer.