Can't cleanup Zombie process and it survives reboots. How to fix?

edit

I'm running Fedora 21 in VirtualBox for experimenting and I just noticed that there is an zombie process:

PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
1276 user+   20   0       0     0        0 Z   0.0  0.0   0:00.05 kwalletd

I've tried to use this:

kill -HUP $(ps -A -ostat,ppid | grep -e '[zZ]'| awk '{ print $2 }')

but it killed KDE and logged me out, and the process was still there and a second one had appeared so I tried to reboot..... It survives reboots. I managed to get it down to the one again. But now I'm stumped.

Question:

How do I clean this up?

EDIT #1

I don't know if the process has the same process id after reboot but know it's still there after. I found that you can't kill an zombie but I did found the above command for cleaning up zombies and somewhere I read I could use kill -9 PID also. None have helped except the above kill cleaned the second zombie.

EDIT #2

I found this zombie process(kwalletd) on all my Fedora's(4 F21 64 bit KDE). Google search didn't give anything, anyone have an idea why this process is a zombie?

EDIT #3

Thank's to @mclmmc I found this bug which is probably releated: kwalletmanager/+bug/1309955