Segfault happened at: 0x7f021ead1af6:	callq  *0x8(%rax)
PC (0x7f021ead1af6) ok
source "*0x8(%rax)" ok
destination "(%rsp)" (0x7fffdbc8f7b0) ok
SP (0x7fffdbc8f7b0) ok
Reason could not be automatically determined.