I fixed find_goroutine(goid) using yesterday’s Allg class and finally I’m able to debug goroutines.Thank you Don!
I uploaded entire to my github repo at

(gdb) info goroutine
  1 waiting  fname=runtime.gopark faddr=0x13415 &g=0xc208000120 waitreason="sleep"
  2 waiting  fname=runtime.gopark faddr=0x13415 &g=0xc208000480 waitreason="force gc (idle)"
  3 waiting  fname=runtime.gopark faddr=0x13415 &g=0xc2080005a0 waitreason="GC sweep wait"
  4 waiting  fname=runtime.gopark faddr=0x13415 &g=0xc2080006c0 waitreason="finalizer wait"
  5 syscall  fname=runtime.switchtoM faddr=0x366c0 &g=0xc2080007e0

(gdb) goroutine 1 bt
#0  runtime.gopark (unlockf=0x2eba0 , lock=0x1576e0 , reason="sleep")
    at /Users/sokoide/repo/go/src/runtime/proc.go:131
#1  0x0000000000013488 in runtime.goparkunlock (lock=0x1576e0 , reason="sleep") at /Users/sokoide/repo/go/src/runtime/proc.go:136
#2  0x0000000000017de5 in runtime.timeSleep (ns=2000000000) at /Users/sokoide/repo/go/src/runtime/time.go:58
#3  0x00000000000020f8 in main.f2 (a=40, b=2, ~r2=833358237544) at /Users/sokoide/workspace/go/foo/foo.go:24
#4  0x0000000000002551 in main.main () at /Users/sokoide/workspace/go/foo/main.go:22

(gdb) goroutine 4 bt
#0  runtime.gopark (unlockf=0x2eba0 , lock=0x15e840 , reason="finalizer wait")
    at /Users/sokoide/repo/go/src/runtime/proc.go:131
#1  0x0000000000013488 in runtime.goparkunlock (lock=0x15e840 , reason="finalizer wait")
    at /Users/sokoide/repo/go/src/runtime/proc.go:136
#2  0x000000000000e66a in runtime.runfinq () at /Users/sokoide/repo/go/src/runtime/malloc.go:727
#3  0x00000000000388f1 in runtime.goexit () at /Users/sokoide/repo/go/src/runtime/asm_amd64.s:2232
#4  0x0000000000000000 in ?? ()

Here is the updated find_goroutine(good).

def find_goroutine(goid):
	find_goroutine attempts to find the goroutine identified by goid.
	It returns a touple of gdv.Value's representing the stack pointer
	and program counter pointer for the goroutine.

	@param int goid

	@return tuple (gdb.Value, gdb.Value)
	__allg = Allg()
	while True:
		ptr = __allg.fetch()
		if not ptr:
		if goid == __allg.Goid(ptr):
		    pc = __allg.Pc(ptr)
		    sp = __allg.Sp(ptr)
		    return pc, sp
	return None, None

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