Just have to point this out: Code 3 means SIGSEGV. SIGSEGVs are Segmentation Faults. They usually occurs when:

• dereferencing NULL pointers,
• attempting to access memory the program does not have rights to (such as kernel structures in process context)
• attempting to access a nonexistent memory address (outside process's address space)
• attempting to write read-only memory (such as code segment),
• a buffer overflow,
• using uninitialized pointers.

This might help you figure out Code 3 problems later on!

(list copied from wiki)

Just have to point this out: Code 3 means SIGSEGV. SIGSEGVs usually occurs when calling a function on an deallocated object. It might help you figure out Code 3 problems later on!