A example usage of the Python script run-until-faulted.py:

[18:20:29] johnny:/Volumes/data/lldb/svn/trunk/utils/test $ ./run-until-faulted.py -l /Volumes/data/lldb/svn/trunk/build/Debug/lldb -e './a.out'
lldb command: /Volumes/data/lldb/svn/trunk/build/Debug/lldb
executable: ./a.out
executable options: 
sending file command....
sending process launch --  (iteration: 0)

* thread #1: tid = 0x2d03, 0x0000000100000eef a.out`main + 39 at main.c:7, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
   4   	{
   5   	    int *null_ptr = 0;
   6   	    printf("Hello, fault!\n");
-> 7   	    printf("Now segfault %d\n", *null_ptr);
   8   	}

(lldb) q
[18:20:40] johnny:/Volumes/data/lldb/svn/trunk/utils/test $