Mismatch in Gstr 1 and gstr 3b

SUMIT KARESIA (155 Points)

10 June 2018  
Sir if a registered person in gst did not file gstr 1 for July to Dec but file gstr 3b and purchaser took input on the basis of invoice than what remedy available to supplier and purchaser in current F. Y and what would be consequences ?
if purchaser is out of gst audit is he liable for interest and penalty ?