Segfault happened at: 0x7fd1b6a3bf2b <_ZNSsC2ERKSs+11>:	mov    -0x8(%rax),%r8d
PC (0x7fd1b6a3bf2b) ok
source "-0x8(%rax)" (0x00000019) not located in a known VMA region (needed readable region)!
destination "%r8d" ok