Segfault happened at: 0x7f5227763f2b <_ZNSsC2ERKSs+11>:	mov    -0x8(%rax),%r8d
PC (0x7f5227763f2b) ok
source "-0x8(%rax)" (0xfffffffffffffff8) not located in a known VMA region (needed readable region)!
destination "%r8d" ok