might be related to bug #1217189 which raises the possibility of hard machine LOCK-UPS due to zram errors. I've had several such lock-ups on precise after the most recent linux-lts-raring updates (and none before that) that seemed to go away after disabling zram.
** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1218278 Title: When creating a swap device using zram I get Buffer I/O errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1218278/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs