I guess this bug also and in other ppp protocols, like pptp, sstp
Jun 09 14:21:48 BRAS accel-pppoe[2913]: eth1:: recv [RADIUS(1) Access-Accept id=1 <Framed-IP-Address 100.64.100.1> Jun 09 14:21:48 BRAS accel-pppoe[2913]: eth1:: radius: gw-ip-address not specified, cann't assign IP address...
For fixing this issue. needs to define gw-ip-address and in [radius] section.