How to stop webbookmarksd crashing on iOS 6?

Since I upgraded to iOS 6, battery drain has been brutal - 10% per hour or faster in standby mode.

Looking at the iPhone's console log (iPhone 4S - SETTINGS-GENERAL-ABOUT-DIAGNOTSTIC & USAGE-D&U DATA), in addition to a few crashes and out of memory errors early today, I have at least a couple hundred crashes of webbookmarksd

Of course, the phone runs warm, and literally gets (uncomfortably) hot to the touch when plugged in.

I'm assuming this is the iCloud Safari data sync process (can anyone confirm?). I've tried turning "off" Safari data in iCloud settings, but it's still launching/crashing. Plus, I really would like to have the iCloud tab syncing.

Any ideas for a fix? What's causing the crashing?