S. 139 : Return of income -Delay due to crashing of computer system – Application which was filed for condonation of delay was rejected, after six years of filing of petition was held to be not justified -CIT was directed to condone the delay and hear the matter expeditiously with the observation that delay in disposing the application after six years of filing of the petition has to be viewed seriously while rendering substantial justice to parties . [ S.119(2)(b) ]