gdb commands

bt - backtrace
frame number - select a particular stack frame
list - see the code
print var_name - print variable's value

Creating core dump

ulimit -c unlimited

To invesigate the core:

dbg program core_file

Using mintty with mingw

If you don't like default mingw console, you can use mintty instead.

mingw-get install mintty

Create link

C:\MinGW\msys\1.0\bin\mintty.exe /bin/env CHERE_INVOKING=1 /bin/bash -l

Source.