GDB - Inspecting a live Ruby process

sudo gdb /usr/local/bin/ruby <pid> ->sudo gdb ruby 2546

then type:

(gdb) set $ary = (int)backtrace(-1)

(gdb) set $count = *($ary+8)

(gdb) set $index = 0

(gdb) while $index < $count

> x/1s *((int)rb_ary_entry($ary, $index)+12)

> set $index = $index + 1

>end

(gdb) call rb_raise(rb_eException, "raising an exception")