Upgraded to Mavericks  and time machine backups keep failing.

I upgraded to Mavericks a few days ago and now I find my time machine backups keep failing. I first tried turning off the power to the time machine then turning it on again and I managed to get one complete backup but that took over 20 hours to complete.
The time machine  backup mode never seems to get beyond " preparing backup" then showing the message "backing up failed, disc already in use"
The time machine backup worked fine before I upgraded, is there a way round this problem or will I have to go through reloading the time machine as if it were a new piece of equipment?
My wife's iMac is still on mountain lion 10.8.5  and the backups on the same Time Machine work fine.
Any help would be gratefully received
Greg

Hi,
I have exactly the same problem.
MBP 2011 running 10.9 named "ebook"
MacMini running 10.8.5 server with TM share
everything works fine UNTIL for some reason the MBP is interrupted during a TM backup ...
After that I get the disk already in use error !
Rebooting the MBP wont help, but I narrowed the problem down ...
Looking on the Mini server I noticed :
- the TM backup user stays connected over AFP, even after several hours of inactivity and a couple of reboots of the MBP. Killing the AFP connection works, But problem stil continues !
- looking on the MBP with "lsof | grep ebook" showed me that the SparseBundles were still in use by the AFP process ... Using the Server control panel and restarting AFP solved that ...
After restarting the AFP process the remote TM Backup started to work again !
A couple of days later, the same problem occurred again, fixed it by this work around ...
I hope there will be a more permanent solotiun for this !

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