How can I get GDB to tell me what address caused a segfault?

Question

I\'d like to know if my program is accessing NULL pointers or stale memory.

The backtrace looks like this:

Program received signal SIGSEGV, Segmentation f         


        

Answer 1

Run your program under GDB. When the segfault occurs, GDB will inform you of the line and statement of your program, along with the variable and its associated address.

You can use the "print" (p) command in GDB to inspect variables. If the crash occurred in a library call, you can use the "frame" series of commands to see the stack frame in question.