filter out some bs from stack traces
filter out some bs from stack traces

brownplt/LambdaS5,lijunsong/LambdaS5,brownplt/LambdaS5,logchi/LambdaS5,lijunsong/LambdaS5,logchi/LambdaS5,brownplt/LambdaS5,lijunsong/LambdaS5,logchi/LambdaS5