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...or it? And is it necessary to add push_back() after new CallInst ? And if I used those two instructions , it works well. Thanks Instruction *InstrCall = new CallInst (InstrFn, Args , ""); BB->getInstList().insert(InsertPos,InstrCall); Error inforamtion: %opt -load ../../lib/Debug/libcntPass.so -cntPass<insert.bc -f -o i.bc BB name : entry opt: SymbolTableListTraitsImpl.h:53: void llvm::SymbolTableListTraits<ValueSubClass, ItemParentClass, SymTabClass, SubClass>::addNodeToList(ValueSubClass*) [with ValueSubClass = llvm::Instruction, ItemParentClass = llvm::BasicBlock, SymTab...