the second might be a hardware problem. just did a hardware test through my provider and they are going to replace some hardware.
why would the first one be normal? I read that the information schema shouldn't be dumped by default anyway !?
Does this mean the first error doesn't affect my backups?
mysqldump does not dump the INFORMATION_SCHEMA database by default. As of MySQL 5.1.38, mysqldump dumps INFORMATION_SCHEMA if you name it explicitly on the command line, although currently you must also use the --skip-lock-tables option. Before 5.1.38, mysqldump silently ignores INFORMATION_SCHEMA even if you name it explicitly on the command line.