pprof disasm is not work right after go 1.16

[zdyj3170101136]

Please answer these questions before submitting your issue. Thanks!

What version of pprof are you using?

yangjie05-mac:awesomeProject35 jie.yang05$ go version
go version go1.17.4 darwin/arm64

What system os and processor architecture are you using?

macos

yangjie05-mac:awesomeProject35 jie.yang05$ arch
arm64

What did you do?

I run my code and want to get disasm from the cpuprofile.

code:

package main

import (
	"math/rand"
	"os"
	"runtime/pprof"
	"time"
)

var global int

func main() {
	f, _ := os.Create("cpu.pprof")
	pprof.StartCPUProfile(f)
	t := time.After(3 * time.Second)
loop:
	for {
		select {
		case <-t:
			break loop
		default:
			global = rand.Int()
		}
	}
	pprof.StopCPUProfile()
	f.Sync()
	f.Close()
}

script:

go build -o=bin main.go
./bin
go tool pprof  bin cpu.pprof
disasm rand

What did you expect to see?

expect to see (which i run in my macos with same code but go version 1.16)

(pprof) disasm rand
Total: 2.67s
ROUTINE ======================== math/rand.(*lockedSource).Int63
     450ms      450ms (flat, cum) 16.85% of Total
     220ms      220ms    106ce80: MOVQ GS:0x30, CX                        ;math/rand.(*lockedSource).Int63 rand.go:387
         .          .    106ce89: CMPQ 0x10(CX), SP                       ;rand.go:387
         .          .    106ce8d: JBE 0x106cf90
         .          .    106ce93: SUBQ $0x20, SP
         .          .    106ce97: MOVQ BP, 0x18(SP)
         .          .    106ce9c: LEAQ 0x18(SP), BP
         .          .    106cea1: XORL AX, AX                             ;rand.go:388
         .          .    106cea3: MOVQ 0x28(SP), DX
         .          .    106cea8: MOVL $0x1, BX
         .          .    106cead: LOCK CMPXCHGL BX, 0(DX)
      60ms       60ms    106ceb1: SETE BL                                 ;math/rand.(*lockedSource).Int63 rand.go:388

What did you see instead?

nothing but total

(pprof) disasm rand
Total: 2.63s
(pprof) 

[cristaloleg]

Also https://github.com/golang/go/issues/50891