Segfault happened at: 0x7f0904a7ad37 <XForceScreenSaver+23>:	callq  *(%rax)
PC (0x7f0904a7ad37) ok
source "*(%rax)" ok
destination "(%rsp)" (0x7ffc849342f0) ok
SP (0x7ffc849342f0) ok
Reason could not be automatically determined.