Comment # 55 on bug 1055641 from Franck Bui

(In reply to Olli Tuominen from comment #54)
> So today came the dracut patch - and it seems to fix it (something).

There's no actual patch/fix, but only 2 commands added to the shutdown script
to enable debug logs...

> At least I did just reboot and I didn't see the message(s) anymore.

Of course since stderr has been redirected to /dev/kmsg.

> 
> The /oldroot is mounted on <pre-shutdown> stage but when I <Ctrl>-d to
> <shutdown> stage it has disappeared. 
> 
> I copied <pre-shutdown> dmesg to /oldroot/tmp/ but I cannot find it from the
> /tmp/ now. Is it actually a snapshot?

You were asked to copy the output of dmesg in /oldroot, not in /oldroot/tmp...

Can you please follow the instructions and provide the output of dmesg ?