* show all back trace in gdb:
<code>
thread apply all bt
</code>

  * activate core dump (in a shell):
<code>
ulimit -c unlimited
ulimit -c 6000000
</code>

  * load gdb with a core dump (in a shell):
<code>
gdb executable coredump
</code>

  * walk up and down in the stack, to inspect variables in other places of the stack too, not just the current function.
<code>
up, down
</code>

 * layout mode (TUI) (to see src and asm): 
  - switch between mode : c-x a
  - switch between windows : c-x o
  - command line to activate mode : 
<code>
  layout split
  layout src
  layout regs
  layout asm
</code>