Segfault happened at: 0x7f1d431bfaf6:	callq  *0x8(%rax)
PC (0x7f1d431bfaf6) ok
source "*0x8(%rax)" ok
destination "(%rsp)" (0x7fff8bec7b00) ok
SP (0x7fff8bec7b00) ok
Reason could not be automatically determined.