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Using Tor on Debian jessie. Version:

dpkg-query --show --showformat='${Version}' "tor"
0.2.5.12-1

For reproduction of this issue, you could run the following script as root.

set -x

echo '
DnsPort 127.0.0.1:53
DisableNetwork 1
' > /etc/tor/torrc

service tor restart

sleep 2

echo '
DnsPort 127.0.0.1:53
DisableNetwork 0
' > /etc/tor/torrc

service tor reload

Log output:

May 22 22:06:59.000 [notice] Tor 0.2.5.12 (git-3731dd5c3071dcba) opening log file.
May 22 22:06:59.000 [notice] Parsing GEOIP IPv4 file /usr/share/tor/geoip.
May 22 22:06:59.000 [notice] Parsing GEOIP IPv6 file /usr/share/tor/geoip6.
May 22 22:06:59.000 [notice] Bootstrapped 0%: Starting
May 22 22:06:59.000 [notice] Delaying directory fetches: DisableNetwork is set.
May 22 22:07:01.000 [notice] Received reload signal (hup). Reloading config and resetting internal state.
May 22 22:07:01.000 [notice] Read configuration file "/usr/share/tor/tor-service-defaults-torrc".
May 22 22:07:01.000 [notice] Read configuration file "/etc/tor/torrc".
May 22 22:07:01.000 [notice] Opening Socks listener on 127.0.0.1:9050
May 22 22:07:01.000 [notice] Opening DNS listener on 127.0.0.1:53
May 22 22:07:01.000 [warn] Could not bind to 127.0.0.1:53: Permission denied
May 22 22:07:01.000 [notice] Closing partially-constructed Socks listener on 127.0.0.1:9050
May 22 22:07:01.000 [warn] Failed to parse/validate config: Failed to bind one of the listener ports.
May 22 22:07:01.000 [err] Reading config failed--see warnings above. For usage, try -h.
May 22 22:07:01.000 [warn] Restart failed (config error?). Exiting.

If DnsPort 127.0.0.1:53 was out commented, this issue would not occur.