Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x2b3dd6e93f70 (LWP 25984)]
0x00002b3dd5c931bc in string_new (state=0x2b3dd6e95010, 
    str=0xe 
) at string.c:43
43        sz = strlen(str);
(gdb) bt
#0  0x00002b3dd5c931bc in string_new (state=0x2b3dd6e95010, 
    str=0xe 
) at string.c:43
#1  0x00002b3dd5c86f26 in machine_setup_config (m=0x604860) at machine.c:734
#2  0x00002b3dd5c87593 in machine_setup_normal (m=0x604860, argc=8, argv=0x7fffd50c9f78)
    at machine.c:895
#3  0x0000000000400b69 in main (argc=8, argv=0x7fffd50c9f78) at main.c:54
(gdb)