"opening new log file" line goes to err-logfile despite being at loglevel notice
Although I might image the rationale behind it, it is still confusing, that lines like
[notice] Tor 0.2.5.8-rc (git-a64f3ab3ee5c433c) opening log file.
are in the err log file for a torrc config like this :
Log notice file /var/log/tor/notice.log Log warn file /var/log/tor/warn.log Log err file /var/log/tor/err.log
Either the prefix "[notice]" should be changed to "[err]" or probably scrubbed away completely.